diff --git a/crates/engine/src/cmd/pathops.rs b/crates/engine/src/cmd/pathops.rs
index fe27f9424..5eac00532 100644
--- a/crates/engine/src/cmd/pathops.rs
+++ b/crates/engine/src/cmd/pathops.rs
@@ -130,7 +130,7 @@ pub fn specs() -> Vec<CommandSpec> {
             "Simplify…",
             ["Object", "Path"],
             None,
-            "{tolerance?: pt (1), cornerAngle?: deg (30), straightLines?: bool} → {ids, before, after} anchor counts",
+            "{tolerance?: pt (1), level?: 0..100 (the Simplify slider, in place of tolerance: 0 fewest anchor points, 50 is 1 pt, every 10 levels halves or doubles it), auto?: bool (Auto-Simplify: the lowest level whose tolerance is at most 1/400 of the selection's longer side, or 100 when that side is under 12.5 pt), cornerAngle?: deg (30), straightLines?: bool} → {ids, before, after} anchor counts, and the level used with level or auto",
             has_selection,
             simplify
         ),
@@ -800,13 +800,29 @@ fn edit_paths(s: &mut Session, label: &str, f: impl Fn(&PathData) -> PathData) -
 }
 
 fn simplify(s: &mut Session, p: &Value) -> Result<Value> {
+    // With auto, the slider's level is Auto-Simplify's for the selection's size; otherwise it is the level given.
+    let level = if bool_or(p, "auto", false) {
+        let roots = selected_roots(s)?;
+        let size = s.doc()?.doc.bounds_of(&roots, false).map_or(0.0, |b| b.width().max(b.height()));
+        Some(po::auto_simplify_level(size))
+    } else {
+        num_param(p, "level").map(|l| if l.is_finite() { l.round().clamp(0.0, 100.0) } else { po::SIMPLIFY_LEVEL })
+    };
+    let tolerance = match level {
+        Some(l) => po::simplify_level_tolerance(l),
+        None => len_param(p, "tolerance").unwrap_or(1.0),
+    };
     let opts = po::SimplifyOptions {
-        tolerance: len_param(p, "tolerance").unwrap_or(1.0).clamp(1e-4, 1e4),
+        tolerance: tolerance.clamp(1e-4, 1e4),
         corner_angle_deg: num_param(p, "cornerAngle").unwrap_or(30.0).clamp(0.0, 180.0),
         straight_lines: bool_or(p, "straightLines", false),
     };
     let (ids, before, after) = edit_paths(s, "Simplify", |path| po::simplify_with(path, &opts))?;
-    Ok(json!({ "ids": ids.iter().map(|i| i.0).collect::<Vec<_>>(), "before": before, "after": after }))
+    let mut out = json!({ "ids": ids.iter().map(|i| i.0).collect::<Vec<_>>(), "before": before, "after": after });
+    if let Some(l) = level {
+        out["level"] = json!(l);
+    }
+    Ok(out)
 }
 
 fn add_anchor_points(s: &mut Session, _: &Value) -> Result<Value> {
diff --git a/crates/engine/src/lib.rs b/crates/engine/src/lib.rs
index fe6c29551..394cc4dfa 100644
--- a/crates/engine/src/lib.rs
+++ b/crates/engine/src/lib.rs
@@ -36,6 +36,7 @@ pub use journal::Journal;
 pub use tooling::{UiRequest, ViewInfo};
 pub use vectorcraft_doc as doc;
 pub use vectorcraft_doc::cancel;
+pub use vectorcraft_pathops::{SIMPLIFY_LEVEL, simplify_level_tolerance};
 pub use vectorcraft_tools as tools;
 
 #[derive(Debug, thiserror::Error)]
diff --git a/crates/engine/src/tests_pathops.rs b/crates/engine/src/tests_pathops.rs
index 9220223d8..384fa6593 100644
--- a/crates/engine/src/tests_pathops.rs
+++ b/crates/engine/src/tests_pathops.rs
@@ -448,6 +448,58 @@ fn simplify_dense_polyline() {
     assert!(close(bounds(&s, id), Rect::new(0.0, 60.0, 300.0, 140.0), 2.0));
 }
 
+/// A sine wave with an anchor every point over `width` pt, `amplitude` pt high and a wavelength of
+/// `2π × period` pt, its anchors `jag` pt above and below it in turn, selected: (the session, the
+/// path's id).
+fn dense_wave(width: u32, amplitude: f64, period: f64, jag: f64) -> (Session, NodeId) {
+    let mut s = session();
+    let y = |i: u32| 100.0 + amplitude * (f64::from(i) / period).sin() + if i.is_multiple_of(2) { jag } else { -jag };
+    let anchors: Vec<Value> = (0..=width).map(|i| json!({"x": f64::from(i), "y": y(i)})).collect();
+    let r = s.execute("path.create", &json!({"anchors": anchors})).unwrap();
+    (s, NodeId(r["id"].as_u64().unwrap()))
+}
+
+/// The Simplify slider: moving its level from 0 to 100 never lowers the anchor count, level 0
+/// leaves fewer anchors than level 100, and level 50 gives the 1 pt result.
+#[test]
+fn simplify_level_moves_the_anchor_count_monotonically() {
+    let (mut s, id) = dense_wave(300, 40.0, 25.0, 0.0);
+    let mut counts = vec![];
+    for level in (0..=100).step_by(10) {
+        let out = s.execute("object.path.simplify", &json!({ "level": level })).unwrap();
+        assert_eq!(out["level"], json!(f64::from(level)));
+        counts.push(path_of(&s, id).0.anchor_count());
+        s.execute("edit.undo", &json!({})).unwrap();
+    }
+    assert!(counts.windows(2).all(|w| w[0] <= w[1]), "{counts:?}");
+    assert!(counts[0] < counts[10], "{counts:?}");
+    s.execute("object.path.simplify", &json!({"tolerance": 1})).unwrap();
+    assert_eq!(path_of(&s, id).0.anchor_count(), counts[5], "level 50 is 1 pt");
+}
+
+/// Auto-Simplify picks the lowest level whose tolerance is at most 1/400 of the selection's longer
+/// side, and 11 sampled points on each segment of the original path stay that close to the result.
+#[test]
+fn auto_simplify_keeps_the_shape_within_a_400th_of_its_size() {
+    let (mut s, id) = dense_wave(100, 15.0, 8.0, 0.2);
+    let original = path_of(&s, id).0.clone();
+    let out = s.execute("object.path.simplify", &json!({"auto": true})).unwrap();
+    // 100 pt across: 0.25 pt at most, level 70 (0.25 pt).
+    assert_eq!(out["level"], json!(70.0));
+    let result = path_of(&s, id).0.clone();
+    assert!(result.anchor_count() < original.anchor_count() / 2, "{}", result.anchor_count());
+    // How far each point along the original lies from the nearest point of the result.
+    use vectorcraft_geom::ParamCurve;
+    use vectorcraft_geom::kurbo::ParamCurveNearest;
+    let fitted = &result.subpaths[0];
+    let off = |p: vectorcraft_geom::Point| {
+        (0..fitted.segment_count()).map(|i| fitted.segment(i).nearest(p, 1e-9).distance_sq.sqrt()).fold(f64::INFINITY, f64::min)
+    };
+    let sp = &original.subpaths[0];
+    let worst = (0..sp.segment_count()).flat_map(|i| (0..=10).map(move |k| sp.segment(i).eval(f64::from(k) / 10.0))).map(off).fold(0.0, f64::max);
+    assert!(worst <= 100.0 / 400.0, "{worst}");
+}
+
 /// How many steps there are to undo and to redo, and whether the document has unsaved changes.
 fn history(s: &Session) -> (usize, usize, bool) {
     let st = s.doc().unwrap();
diff --git a/crates/engine/tests/command_sweep.rs b/crates/engine/tests/command_sweep.rs
index 06b43b82d..5725a038f 100644
--- a/crates/engine/tests/command_sweep.rs
+++ b/crates/engine/tests/command_sweep.rs
@@ -355,6 +355,9 @@ fn structured_junk() {
         ("object.path.offsetPath", json!({"offset": 1e308})),
         ("object.path.offsetPath", json!({"offset": -1e308})),
         ("object.path.simplify", json!({"tolerance": -1, "cornerAngle": 1e308})),
+        ("object.path.simplify", json!({"level": 1e308, "tolerance": "x"})),
+        ("object.path.simplify", json!({"level": -1e308, "auto": "yes"})),
+        ("object.path.simplify", json!({"auto": true, "level": [1]})),
         (
             "shape.rectangularGrid",
             json!({"x": 0, "y": 0, "width": 1e308, "height": -1e308, "rows": 999, "columns": u64::MAX, "rowSkew": 1e308, "columnSkew": -1e308, "frame": false, "fill": true}),
diff --git a/crates/pathops/src/edit.rs b/crates/pathops/src/edit.rs
index 5cb30bcd7..173d91882 100644
--- a/crates/pathops/src/edit.rs
+++ b/crates/pathops/src/edit.rs
@@ -29,6 +29,30 @@ pub fn simplify(path: &PathData, tolerance: f64) -> PathData {
     simplify_with(path, &SimplifyOptions { tolerance, ..Default::default() })
 }
 
+/// The Simplify slider's level for a tolerance of 1 pt, where the slider opens.
+pub const SIMPLIFY_LEVEL: f64 = 50.0;
+
+/// The tolerance (points) of Simplify slider level `level`, from 0 (the fewest anchor points) to
+/// 100 (the closest to the original): 1 pt at [`SIMPLIFY_LEVEL`], doubled for every 10 levels below
+/// it and halved for every 10 above, so level 0 is 32 pt and level 100 is 1/32 pt. A level outside
+/// 0..=100 counts as the nearer end, and one that is not a number counts as [`SIMPLIFY_LEVEL`].
+pub fn simplify_level_tolerance(level: f64) -> f64 {
+    let level = if level.is_finite() { level.clamp(0.0, 100.0) } else { SIMPLIFY_LEVEL };
+    ((SIMPLIFY_LEVEL - level) / 10.0).exp2()
+}
+
+/// Auto-Simplify's level for paths whose bounds are `size` points on their longer side: the lowest
+/// whole level whose tolerance ([`simplify_level_tolerance`]) is at most 1/400 of `size`. It returns
+/// level 100 for a size of 0 or one that is not a number, and for a size under 12.5 pt, where no
+/// level is that close.
+pub fn auto_simplify_level(size: f64) -> f64 {
+    let target = size / 400.0;
+    if !(target.is_finite() && target > 0.0) {
+        return 100.0;
+    }
+    (SIMPLIFY_LEVEL - 10.0 * target.log2()).ceil().clamp(0.0, 100.0)
+}
+
 /// Simplify never adds anchors: keep whichever subpath is smaller.
 fn no_worse(original: &SubPath, fitted: SubPath) -> SubPath {
     if fitted.anchors.len() > original.anchors.len() { original.clone() } else { fitted }
diff --git a/crates/pathops/src/lib.rs b/crates/pathops/src/lib.rs
index 9cfc0bd5c..29c9f2449 100644
--- a/crates/pathops/src/lib.rs
+++ b/crates/pathops/src/lib.rs
@@ -15,8 +15,8 @@ mod planar;
 
 pub use boolean::{BoolOp, DEFAULT_PRECISION, area, boolean, boolean_n, normalize, try_boolean, try_normalize, unite_all};
 pub use edit::{
-    AverageAxis, SimplifyOptions, add_anchor_points, average, join, remove_anchor, remove_redundant_points, simplify, simplify_with, smooth,
-    split_into_grid,
+    AverageAxis, SIMPLIFY_LEVEL, SimplifyOptions, add_anchor_points, auto_simplify_level, average, join, remove_anchor, remove_redundant_points,
+    simplify, simplify_level_tolerance, simplify_with, smooth, split_into_grid,
 };
 pub use offset::{Cap, Join, offset_path, outline_stroke, stroke_region};
 pub use pathfinder::{FaceMerger, PathfinderOp, Region, Shape, merge_regions, pathfinder, region_at, regions};
diff --git a/crates/pathops/tests/ops.rs b/crates/pathops/tests/ops.rs
index d65fb5b83..cc1da584c 100644
--- a/crates/pathops/tests/ops.rs
+++ b/crates/pathops/tests/ops.rs
@@ -343,6 +343,20 @@ fn simplify_straight_lines_option() {
     assert!(max_deviation(&c, &s) <= 1.0 + 1e-6);
 }
 
+/// The Simplify slider's levels: 1 pt at 50, doubled for every 10 levels down and halved for every
+/// 10 up; Auto-Simplify takes the lowest level whose tolerance is at most 1/400 of the size, and
+/// level 100 for a size under 12.5 pt.
+#[test]
+fn simplify_levels_and_auto_simplify() {
+    assert_eq!(simplify_level_tolerance(SIMPLIFY_LEVEL), 1.0);
+    assert_eq!((simplify_level_tolerance(0.0), simplify_level_tolerance(100.0)), (32.0, 1.0 / 32.0));
+    assert_eq!((simplify_level_tolerance(-5.0), simplify_level_tolerance(500.0), simplify_level_tolerance(f64::NAN)), (32.0, 1.0 / 32.0, 1.0));
+    assert_eq!((auto_simplify_level(400.0), auto_simplify_level(100.0), auto_simplify_level(300.0)), (50.0, 70.0, 55.0));
+    assert!(simplify_level_tolerance(auto_simplify_level(300.0)) <= 300.0 / 400.0);
+    assert_eq!((auto_simplify_level(12.5), auto_simplify_level(10.0)), (100.0, 100.0));
+    assert_eq!((auto_simplify_level(0.0), auto_simplify_level(f64::INFINITY), auto_simplify_level(1e9)), (100.0, 100.0, 0.0));
+}
+
 #[test]
 fn smooth_rounds_corners() {
     let s = smooth(&rect(0.0, 0.0, 10.0, 10.0), 1.0);
diff --git a/crates/ui-egui/src/canvas.rs b/crates/ui-egui/src/canvas.rs
index a2d2c7fba..6599cda9b 100644
--- a/crates/ui-egui/src/canvas.rs
+++ b/crates/ui-egui/src/canvas.rs
@@ -552,7 +552,8 @@ pub fn show(app: &mut VectorcraftApp, ui: &mut Ui) {
         }
         rulers(ui, full, &xf, app.hover_doc, app.session.general_unit(), origin_preview.unwrap_or_else(|| app.ruler_origin()), &t);
     }
-    if app.ui.task_bar && !revolve_edit && !app.session.tool_busy() && app.ui.screen_mode < 3 {
+    // The task bar is not drawn while the Simplify slider shows.
+    if app.ui.task_bar && !revolve_edit && !app.session.tool_busy() && app.ui.screen_mode < 3 && !crate::dialogs::simplify_slider::showing(app) {
         task_bar(app, ui, &xf);
     }
     if app.ui.screen_mode < 3 {
diff --git a/crates/ui-egui/src/dialogs/form.rs b/crates/ui-egui/src/dialogs/form.rs
index a1d3b54c1..b750a6501 100644
--- a/crates/ui-egui/src/dialogs/form.rs
+++ b/crates/ui-egui/src/dialogs/form.rs
@@ -611,14 +611,21 @@ pub(super) fn preview_result(
         }
         return None;
     }
+    preview_now(app, d, label, cmd, params)
+}
+
+/// The preview of [`preview_result`] without its checkbox: `params` run again on the interaction's
+/// snapshot when they differ from the last preview. Returns the command's result only when a new
+/// preview succeeds.
+pub(super) fn preview_now(app: &mut crate::VectorcraftApp, d: &mut Dialog, label: &str, cmd: &str, params: Value) -> Option<Value> {
     let mut result = None;
-    if d.fields.get(LAST) != Some(&params) || !app.session.in_interaction() {
+    if d.fields.get(PREVIEWED) != Some(&params) || !app.session.in_interaction() {
         let _ = app.session.begin_interaction(label);
         match app.session.preview(cmd, &params) {
             Ok(r) => result = Some(r),
             Err(e) => app.status(e.to_string()),
         }
-        d.fields.insert(LAST.into(), params);
+        d.fields.insert(PREVIEWED.into(), params);
     }
     result
 }
diff --git a/crates/ui-egui/src/dialogs/mod.rs b/crates/ui-egui/src/dialogs/mod.rs
index 4c05c3b77..7f1edf31c 100644
--- a/crates/ui-egui/src/dialogs/mod.rs
+++ b/crates/ui-egui/src/dialogs/mod.rs
@@ -89,6 +89,7 @@ pub mod save_swatch_library;
 pub mod script_check;
 mod shapes;
 pub mod shortcut_import;
+pub(crate) mod simplify_slider;
 pub mod slices;
 pub mod spot_colors;
 pub(crate) mod svg_options;
@@ -325,6 +326,7 @@ registry! {
     Plugin: [plugin::KIND] => plugin::SPEC,
     ScriptCheck: [script_check::KIND] => script_check::SPEC,
     VectorHalftone: [halftone::KIND] => halftone::SPEC,
+    SimplifySlider: [simplify_slider::KIND] => simplify_slider::SPEC,
     PerspectiveGrid: [perspective_grid::KIND] => perspective_grid::SPEC,
     Envelope: [envelope::WARP, envelope::MESH, envelope::OPTIONS] => envelope::SPEC,
     LiquifyOptions: [liquify::KIND] => liquify::SPEC,
diff --git a/crates/ui-egui/src/dialogs/path_ops.rs b/crates/ui-egui/src/dialogs/path_ops.rs
index 162435462..c46096a00 100644
--- a/crates/ui-egui/src/dialogs/path_ops.rs
+++ b/crates/ui-egui/src/dialogs/path_ops.rs
@@ -101,9 +101,18 @@ fn split_grid(ui: &mut egui::Ui, d: &mut Dialog, unit: Unit) {
     form::check(ui, d, "addGuides", tl!("Add Guides"));
 }
 
+/// The fields the Simplify dialog opens with at `tolerance` (points): the slider's tolerance when
+/// its More Options opens the dialog.
+pub(crate) fn simplify_dialog(tolerance: f64) -> Value {
+    json!({"tolerance": tolerance, "angleThreshold": ANGLE_THRESHOLD, "straightLines": false, "showOriginal": false, "retain": false, "preview": true})
+}
+
+/// The fields the Simplify dialog keeps when OK confirms it with `retain` ticked.
+const SIMPLIFY_KEPT: [&str; 6] = ["tolerance", "angleThreshold", "straightLines", "showOriginal", "retain", "preview"];
+
 /// Simplify's fields: Tolerance, Corner Point Angle Threshold (its label above a slider from 0° on
-/// the left, the smoothest, to 180°, the sharpest), Convert to Straight Lines and Show Original
-/// Path.
+/// the left, the smoothest, to 180°, the sharpest), Convert to Straight Lines, Show Original Path
+/// and Open this dialog with these settings next time.
 fn simplify_fields(ui: &mut egui::Ui, d: &mut Dialog, unit: Unit) {
     let rail = Tokens::get(ui.ctx()).input_border;
     egui::Grid::new("dlg").num_columns(2).spacing([10.0, 8.0]).show(ui, |ui| {
@@ -115,6 +124,7 @@ fn simplify_fields(ui: &mut egui::Ui, d: &mut Dialog, unit: Unit) {
     ui.add_space(8.0);
     form::check(ui, d, "straightLines", tl!("Convert to Straight Lines"));
     form::check(ui, d, "showOriginal", tl!("Show Original Path"));
+    form::check(ui, d, "retain", tl!("Open this dialog with these settings next time"));
 }
 
 /// Simplify's Show Original Path: while the dialog previews with it on, every path the preview ran
@@ -175,6 +185,12 @@ fn confirm(app: &mut VectorcraftApp, d: &Dialog) -> Result<Value, String> {
         return run_and_close(app, id, params);
     }
     let r = form::commit_preview(app, id, params)?;
+    // Simplify: with retain ticked, the menu item opens this dialog on these fields next time; with it
+    // unticked, the menu item opens the slider.
+    if d.kind == "simplify" {
+        let kept = SIMPLIFY_KEPT.into_iter().filter_map(|k| Some((k.to_string(), d.fields.get(k)?.clone())));
+        app.ui.simplify = if d.bool("retain") { Value::Object(kept.collect()) } else { Value::Null };
+    }
     // The fields as the dialog held them, so they show as typed when it opens again.
     if d.kind == "offsetPath" {
         let kept = ["offset", "joins", "miterLimit"].into_iter().filter_map(|k| Some((k.to_string(), d.fields.get(k)?.clone())));
diff --git a/crates/ui-egui/src/dialogs/simplify_slider.rs b/crates/ui-egui/src/dialogs/simplify_slider.rs
new file mode 100644
index 000000000..a1c8871de
--- /dev/null
+++ b/crates/ui-egui/src/dialogs/simplify_slider.rs
@@ -0,0 +1,165 @@
+//! Object › Path › Simplify's slider: a strip under the selection with Auto-Simplify, a slider from
+//! the fewest anchor points (left) to the closest fit to the original (right), and More Options,
+//! which opens the Simplify dialog at the slider's tolerance. While the strip is open, the canvas
+//! previews `object.path.simplify {level}`; Enter or a click outside the strip keeps the result as
+//! one undo step, and Escape puts the paths back. The slider opens at level 50, a tolerance of
+//! 1 pt (`vectorcraft_pathops::simplify_level_tolerance` maps levels to tolerances).
+//!
+//! Fields: `level` (0..=100, the command's parameter).
+
+use egui::{Color32, CornerRadius, Order, Pos2, Sense, Stroke, vec2};
+use serde_json::{Value, json};
+use vectorcraft_engine::{SIMPLIFY_LEVEL, simplify_level_tolerance};
+use vectorcraft_geom::Rect;
+
+use super::{DialogResult, DialogSpec, form, modal};
+use crate::state::Dialog;
+use crate::theme::Tokens;
+use crate::{VectorcraftApp, widgets};
+
+/// The dialog kind of the Simplify slider.
+pub(crate) const KIND: &str = "simplifySlider";
+
+pub(super) const SPEC: DialogSpec = DialogSpec { window: Some(show), confirm, preview: true, ..DialogSpec::FORM };
+
+/// The command the slider previews, and its undo label.
+const CMD: &str = "object.path.simplify";
+const LABEL: &str = "Simplify";
+
+/// The fields the slider opens with.
+pub(crate) fn fields() -> Value {
+    json!({ "level": SIMPLIFY_LEVEL })
+}
+
+/// Whether the Simplify slider is open.
+pub(crate) fn showing(app: &VectorcraftApp) -> bool {
+    app.ui.dialog.as_ref().is_some_and(|d| d.kind == KIND)
+}
+
+/// The slider's level, a whole number from 0 to 100.
+fn level(d: &Dialog) -> f64 {
+    let l = d.f64("level", SIMPLIFY_LEVEL);
+    if l.is_finite() { l.round().clamp(0.0, 100.0) } else { SIMPLIFY_LEVEL }
+}
+
+fn params(d: &Dialog) -> Value {
+    json!({ "level": level(d) })
+}
+
+fn confirm(app: &mut VectorcraftApp, d: &Dialog) -> DialogResult {
+    form::commit_preview(app, CMD, params(d))
+}
+
+/// The open slider, or an error when it isn't open.
+fn open_slider(app: &VectorcraftApp) -> Result<Dialog, String> {
+    app.ui.dialog.clone().filter(|d| d.kind == KIND).ok_or_else(|| "the Simplify slider is not open".to_string())
+}
+
+/// Auto-Simplify (`ui.simplifyAuto`): the open slider moves to the level `object.path.simplify
+/// {auto: true}` picks for the selection, and the canvas previews it → {level}.
+pub(crate) fn auto(app: &mut VectorcraftApp) -> Result<Value, String> {
+    let mut d = open_slider(app)?;
+    let _ = app.session.begin_interaction(LABEL);
+    let r = app.session.preview(CMD, &json!({ "auto": true })).map_err(|e| e.to_string())?;
+    let level = r["level"].as_f64().unwrap_or(SIMPLIFY_LEVEL);
+    d.fields.insert("level".into(), json!(level));
+    d.fields.insert(form::PREVIEWED.into(), params(&d));
+    app.ui.dialog = Some(d);
+    Ok(json!({ "level": level }))
+}
+
+/// More Options (`ui.simplifyMoreOptions`): the Simplify dialog takes the slider's place, at the
+/// slider's tolerance → {tolerance}.
+pub(crate) fn more_options(app: &mut VectorcraftApp) -> Result<Value, String> {
+    let d = open_slider(app)?;
+    let tolerance = simplify_level_tolerance(level(&d));
+    app.ui.dialog = Some(Dialog::new("simplify", super::path_ops::simplify_dialog(tolerance)));
+    Ok(json!({ "tolerance": tolerance }))
+}
+
+/// The private field that holds the selection's bounds before the preview, `[x0, y0, x1, y1]`.
+const BOUNDS: &str = "__bounds";
+
+/// The selection's bounds before the preview: the interaction's snapshot when a preview runs, read
+/// once and kept in `d`, so the strip stays where it opened while the preview changes the paths.
+fn bounds(app: &mut VectorcraftApp, d: &mut Dialog) -> Option<Rect> {
+    if let Some([x0, y0, x1, y1]) = d.fields.get(BOUNDS).and_then(|v| serde_json::from_value::<[f64; 4]>(v.clone()).ok()) {
+        return Some(Rect::new(x0, y0, x1, y1));
+    }
+    let b = match app.session.active().and_then(|st| st.interaction.as_ref()) {
+        Some(it) => it.doc.bounds_of(&it.selection.objects, true),
+        None => app.selection_bounds(),
+    }?;
+    d.fields.insert(BOUNDS.into(), json!([b.x0, b.y0, b.x1, b.y1]));
+    Some(b)
+}
+
+/// Where the strip goes: under the lowest corner on screen of `bounds` (the selection's, before the
+/// preview), centered on them, kept on the canvas.
+fn place(app: &mut VectorcraftApp, ctx: &egui::Context, id: egui::Id, bounds: Option<Rect>) -> Pos2 {
+    let size = egui::AreaState::load(ctx, id).and_then(|s| s.size).unwrap_or(vec2(270.0, 42.0));
+    let screen = ctx.content_rect();
+    let Some((rect, view)) = app.canvas_rect.zip(app.view().copied()) else { return screen.center() - size / 2.0 };
+    let xf = crate::canvas::Xf::new(rect, &view);
+    let under = match bounds {
+        Some(b) => {
+            let lowest = xf.quad(b).iter().map(|c| c.y).fold(f32::NEG_INFINITY, f32::max);
+            Pos2::new(xf.to_screen(b.center()).x - size.x / 2.0, lowest + 28.0)
+        }
+        None => rect.center() - size / 2.0,
+    };
+    let bounds = rect.shrink(8.0);
+    under.clamp(bounds.min, (bounds.max - size).max(bounds.min))
+}
+
+/// What a button of the strip asked for.
+enum Action {
+    Auto,
+    MoreOptions,
+}
+
+fn show(app: &mut VectorcraftApp, ctx: &egui::Context) {
+    let Some(mut d) = app.ui.dialog.clone() else { return };
+    let t = Tokens::get(ctx);
+    let id = egui::Id::new(("dialog", KIND));
+    let b = bounds(app, &mut d);
+    let pos = place(app, ctx, id, b);
+    // A click anywhere else keeps the result, and the rest of the app doesn't take it.
+    let dim = modal::backdrop();
+    let outside =
+        egui::Area::new(dim.id).order(dim.order).fixed_pos(Pos2::ZERO).show(ctx, |ui| ui.allocate_rect(ctx.content_rect(), Sense::click())).inner;
+    let mut action = None;
+    egui::Area::new(id).order(Order::Foreground).fixed_pos(pos).show(ctx, |ui| {
+        egui::Frame::NONE
+            .fill(t.panel)
+            .stroke(Stroke::new(1.0, t.tool_active))
+            .corner_radius(CornerRadius::same(5))
+            .inner_margin(egui::Margin::symmetric(8, 6))
+            .shadow(egui::epaint::Shadow { offset: [0, 3], blur: 10, spread: 0, color: Color32::from_black_alpha(70) })
+            .show(ui, |ui| {
+                ui.horizontal(|ui| {
+                    ui.spacing_mut().item_spacing.x = 6.0;
+                    if widgets::icon_button(ui, "wand-sparkles", tl!("Auto-Simplify"), false, 28.0).clicked() {
+                        action = Some(Action::Auto);
+                    }
+                    let rail = t.input_border;
+                    form::slider_rail_named(ui, &mut d, "level", tl!("Simplify"), 0.0..=100.0, &|_| rail);
+                    if widgets::icon_button(ui, "ellipsis", tl!("More Options"), false, 28.0).clicked() {
+                        action = Some(Action::MoreOptions);
+                    }
+                });
+            });
+    });
+    let p = params(&d);
+    let _ = form::preview_now(app, &mut d, LABEL, CMD, p);
+    app.ui.dialog = Some(d);
+    let r = match action {
+        Some(Action::Auto) => auto(app),
+        Some(Action::MoreOptions) => more_options(app),
+        None if outside.clicked() || ctx.input(|i| i.key_pressed(egui::Key::Enter)) => super::confirm(app),
+        None => Ok(Value::Null),
+    };
+    if let Err(e) = r {
+        app.status(e);
+    }
+}
diff --git a/crates/ui-egui/src/dialogs/tests.rs b/crates/ui-egui/src/dialogs/tests.rs
index 2d12c7fd2..823b8cf6d 100644
--- a/crates/ui-egui/src/dialogs/tests.rs
+++ b/crates/ui-egui/src/dialogs/tests.rs
@@ -474,6 +474,10 @@ fn menu_parameter_dialogs_are_compact() {
         app.run("shape.rectangle", json!({"x": 10, "y": 10, "width": 50, "height": 50})).unwrap();
         app.run("select.all", json!({})).unwrap();
         crate::menus::invoke(&mut app, id, json!({}));
+        // Simplify opens its slider; More Options opens the dialog.
+        if id == "object.path.simplify" {
+            app.run("ui.simplifyMoreOptions", json!({})).unwrap();
+        }
         assert!(app.ui.dialog.is_some(), "{id} opened no dialog");
         let wide = dialog_rect(&mut app, 1600.0);
         eprintln!("{id}: {:.0} × {:.0} in a 1600-point window", wide.width(), wide.height());
diff --git a/crates/ui-egui/src/dialogs/tests_modal.rs b/crates/ui-egui/src/dialogs/tests_modal.rs
index cee3d1cc6..e89dda7e6 100644
--- a/crates/ui-egui/src/dialogs/tests_modal.rs
+++ b/crates/ui-egui/src/dialogs/tests_modal.rs
@@ -292,13 +292,181 @@ fn app_with_dense_path() -> VectorcraftApp {
     app
 }
 
+/// Object › Path › Simplify, then the slider's More Options: the Simplify dialog.
+fn open_simplify_dialog(app: &mut VectorcraftApp) {
+    crate::menus::invoke(app, "object.path.simplify", json!({}));
+    app.run("ui.simplifyMoreOptions", json!({})).unwrap();
+}
+
+/// The anchors of the paths in `app`'s document.
+fn anchor_count(app: &VectorcraftApp) -> usize {
+    let mut n = 0;
+    app.session.doc().unwrap().doc.walk(|node| {
+        if let vectorcraft_doc::NodeKind::Path { path, .. } = &node.kind {
+            n += path.anchor_count();
+        }
+    });
+    n
+}
+
+/// The parameters of the Simplify preview on the canvas.
+fn simplify_preview(app: &VectorcraftApp) -> serde_json::Value {
+    app.session.doc().unwrap().interaction.as_ref().and_then(|it| it.preview.clone()).expect("a preview").1
+}
+
+/// The Simplify slider's strip, and the centers of its Auto-Simplify button, its rail and its More
+/// Options button.
+fn slider_strip(ctx: &egui::Context) -> (Rect, Pos2, Pos2, Pos2) {
+    let r = rect_of(ctx, egui::Id::new(("dialog", simplify_slider::KIND)));
+    let y = r.center().y;
+    (r, Pos2::new(r.left() + 8.0 + 14.0, y), Pos2::new(r.left() + 8.0 + 28.0 + 6.0 + 90.0, y), Pos2::new(r.right() - 8.0 - 14.0, y))
+}
+
+/// Object › Path › Simplify opens a slider under the selection that previews the 1 pt result.
+/// Dragging it to the right previews more anchor points and to the left fewer, and Enter keeps the
+/// result as one undo step.
+#[test]
+fn simplify_opens_a_slider_whose_drag_previews_fewer_or_more_points() {
+    let (ctx, mut app) = (ctx(), app_with_dense_path());
+    let undo_len = app.session.doc().unwrap().history.undo.len();
+    crate::menus::invoke(&mut app, "object.path.simplify", json!({}));
+    assert_eq!(app.ui.dialog.as_ref().map(|d| d.kind.as_str()), Some(simplify_slider::KIND));
+    settle(&ctx, &mut app);
+    assert_eq!(simplify_preview(&app), json!({"level": 50.0}));
+    assert_eq!(anchor_count(&app), 2, "the 1 pt result");
+    let (_, _, rail, _) = slider_strip(&ctx);
+    drag(&ctx, &mut app, rail, vec2(100.0, 0.0));
+    assert_eq!(simplify_preview(&app), json!({"level": 100.0}));
+    let most = anchor_count(&app);
+    assert!(most > 2, "{most}");
+    let (_, _, rail, _) = slider_strip(&ctx);
+    drag(&ctx, &mut app, rail + vec2(90.0, 0.0), vec2(-190.0, 0.0));
+    assert_eq!(simplify_preview(&app), json!({"level": 0.0}));
+    assert_eq!(anchor_count(&app), 2);
+    frame(
+        &ctx,
+        &mut app,
+        vec![Event::Key { key: egui::Key::Enter, physical_key: None, pressed: true, repeat: false, modifiers: Default::default() }],
+    );
+    assert!(app.ui.dialog.is_none() && !app.session.in_interaction());
+    assert_eq!(app.session.doc().unwrap().history.undo.len(), undo_len + 1);
+    assert_eq!(anchor_count(&app), 2);
+}
+
+/// Escape, taken by the app's key handling before the dialog layer draws, closes the Simplify
+/// slider and puts the paths back as they were, with no undo step.
+#[test]
+fn simplify_slider_escape_puts_the_paths_back() {
+    let (ctx, mut app) = (ctx(), app_with_dense_path());
+    let before = app.session.doc().unwrap().doc.clone();
+    let undo_len = app.session.doc().unwrap().history.undo.len();
+    crate::menus::invoke(&mut app, "object.path.simplify", json!({}));
+    settle(&ctx, &mut app);
+    let (_, _, rail, _) = slider_strip(&ctx);
+    drag(&ctx, &mut app, rail, vec2(100.0, 0.0));
+    assert_eq!(simplify_preview(&app), json!({"level": 100.0}));
+    assert_ne!(app.session.doc().unwrap().doc, before, "the preview changes the path");
+    let escape = Event::Key { key: egui::Key::Escape, physical_key: None, pressed: true, repeat: false, modifiers: Default::default() };
+    let input = egui::RawInput { screen_rect: Some(Rect::from_min_size(Pos2::ZERO, SCREEN)), events: vec![escape], ..Default::default() };
+    let mut out = ctx.run_ui(input, |ui| {
+        crate::shortcuts::handle(&mut app, ui.ctx());
+        show(&mut app, ui.ctx());
+    });
+    out.textures_delta.clear();
+    assert!(app.ui.dialog.is_none() && !app.session.in_interaction());
+    assert_eq!(app.session.doc().unwrap().doc, before);
+    assert_eq!(app.session.doc().unwrap().history.undo.len(), undo_len);
+    assert_eq!(anchor_count(&app), 20);
+}
+
+/// The Simplify slider stays where it opened, under the paths as they were, while the preview
+/// changes their bounds, so a drag doesn't move the rail under the pointer.
+#[test]
+fn simplify_slider_stays_where_it_opened_while_the_preview_changes_the_bounds() {
+    let ctx = ctx();
+    let mut app = VectorcraftApp::new(Session::new(), Default::default());
+    app.run("file.new", json!({"width": 400, "height": 300})).unwrap();
+    app.canvas_rect = Some(Rect::from_min_size(Pos2::ZERO, SCREEN));
+    // A hump 20 pt high, which level 0 (32 pt) fits with a lower curve, seen at 400%.
+    let anchors: Vec<_> = (0..20).map(|i| json!({"x": 30 + i * 15, "y": 100.0 + 20.0 * (std::f64::consts::PI * i as f64 / 19.0).sin()})).collect();
+    app.run("path.create", json!({"anchors": anchors})).unwrap();
+    app.run("view.setZoom", json!({"zoom": 400})).unwrap();
+    app.view_mut().unwrap().center = vectorcraft_geom::Point::new(172.5, 60.0);
+    let before = app.selection_bounds().unwrap();
+    crate::menus::invoke(&mut app, "object.path.simplify", json!({}));
+    settle(&ctx, &mut app);
+    let opened = rect_of(&ctx, egui::Id::new(("dialog", simplify_slider::KIND)));
+    app.ui.dialog.as_mut().unwrap().fields.insert("level".into(), json!(0));
+    settle(&ctx, &mut app);
+    assert_eq!(simplify_preview(&app), json!({"level": 0.0}));
+    let after = app.selection_bounds().unwrap();
+    assert!(after.height() < before.height() - 0.5, "the preview changes the bounds: {before:?} → {after:?}");
+    assert_eq!(rect_of(&ctx, egui::Id::new(("dialog", simplify_slider::KIND))), opened);
+}
+
+/// Auto-Simplify moves the slider to the level that keeps the path within 1/400 of its size, and a
+/// click outside the strip keeps the result as one undo step.
+#[test]
+fn simplify_slider_auto_simplify_and_a_click_outside_keep_the_result() {
+    let (ctx, mut app) = (ctx(), app_with_dense_path());
+    let before = app.session.doc().unwrap().doc.clone();
+    let undo_len = app.session.doc().unwrap().history.undo.len();
+    crate::menus::invoke(&mut app, "object.path.simplify", json!({}));
+    settle(&ctx, &mut app);
+    let (_, auto, ..) = slider_strip(&ctx);
+    click(&ctx, &mut app, auto);
+    // The path is 285 pt wide: 0.7125 pt at most, level 55.
+    assert_eq!(app.ui.dialog.as_ref().unwrap().f64("level", 0.0), 55.0);
+    assert_eq!(app.session.doc().unwrap().interaction.as_ref().and_then(|it| it.preview.clone()).unwrap().1, json!({"auto": true}));
+    frame(&ctx, &mut app, vec![]);
+    assert_eq!(anchor_count(&app), 2);
+    assert!(app.session.in_interaction(), "the result waits for a click outside");
+    click(&ctx, &mut app, Pos2::new(20.0, 20.0));
+    assert!(app.ui.dialog.is_none() && !app.session.in_interaction());
+    assert_eq!(app.session.doc().unwrap().history.undo.len(), undo_len + 1);
+    assert_ne!(app.session.doc().unwrap().doc, before);
+}
+
+/// More Options opens the Simplify dialog at the slider's tolerance. With "Open this dialog with
+/// these settings next time" ticked, OK makes the menu item open the dialog on its settings; with
+/// it unticked, the slider again.
+#[test]
+fn simplify_slider_more_options_and_the_dialog_that_opens_directly() {
+    let (ctx, mut app) = (ctx(), app_with_dense_path());
+    crate::menus::invoke(&mut app, "object.path.simplify", json!({}));
+    app.ui.dialog.as_mut().unwrap().fields.insert("level".into(), json!(60));
+    settle(&ctx, &mut app);
+    assert_eq!(simplify_preview(&app), json!({"level": 60.0}));
+    let (_, _, _, more) = slider_strip(&ctx);
+    click(&ctx, &mut app, more);
+    let d = app.ui.dialog.as_ref().unwrap();
+    assert_eq!((d.kind.as_str(), d.f64("tolerance", 0.0), d.bool("retain")), ("simplify", 0.5, false));
+    settle(&ctx, &mut app);
+    assert_eq!(simplify_preview(&app)["tolerance"], json!(0.5));
+    let texts = frame(&ctx, &mut app, vec![]);
+    let retain = texts.iter().find(|(t, _)| t == "Open this dialog with these settings next time").map(|(_, r)| *r).expect("the checkbox");
+    click(&ctx, &mut app, retain.center());
+    app.ui.dialog.as_mut().unwrap().fields.insert("straightLines".into(), json!(true));
+    confirm(&mut app).unwrap();
+    crate::menus::invoke(&mut app, "object.path.simplify", json!({}));
+    let d = app.ui.dialog.clone().unwrap();
+    assert_eq!((d.kind.as_str(), d.f64("tolerance", 0.0), d.bool("straightLines"), d.bool("retain")), ("simplify", 0.5, true, true));
+    app.ui.dialog.as_mut().unwrap().fields.insert("retain".into(), json!(false));
+    confirm(&mut app).unwrap();
+    crate::menus::invoke(&mut app, "object.path.simplify", json!({}));
+    assert_eq!(app.ui.dialog.as_ref().map(|d| d.kind.as_str()), Some(simplify_slider::KIND));
+    assert!(app.run("ui.simplifyAuto", json!({})).is_ok());
+    cancel(&mut app);
+    assert!(app.run("ui.simplifyMoreOptions", json!({})).is_err(), "the slider is not open");
+}
+
 #[test]
 fn simplify_dialog_preview_counts_and_cancel_restore_the_original() {
     let (ctx, mut app) = (ctx(), app_with_dense_path());
     let before = app.session.doc().unwrap().doc.clone();
     let selection = app.session.doc().unwrap().selection.clone();
     let undo_len = app.session.doc().unwrap().history.undo.len();
-    crate::menus::invoke(&mut app, "object.path.simplify", json!({}));
+    open_simplify_dialog(&mut app);
     settle(&ctx, &mut app);
     let texts = frame(&ctx, &mut app, vec![]);
     let preview = texts.iter().find(|(t, _)| t == "Preview").map(|(_, r)| *r).expect("a Preview checkbox");
@@ -337,7 +505,7 @@ fn simplify_dialog_ok_keeps_exactly_one_undo_with_or_without_preview() {
         let before = app.session.doc().unwrap().doc.clone();
         let selection = app.session.doc().unwrap().selection.clone();
         let undo_len = app.session.doc().unwrap().history.undo.len();
-        crate::menus::invoke(&mut app, "object.path.simplify", json!({}));
+        open_simplify_dialog(&mut app);
         app.ui.dialog.as_mut().unwrap().fields.insert("preview".into(), json!(on));
         settle(&ctx, &mut app);
         if on {
@@ -381,7 +549,7 @@ fn only_straight_segments(app: &VectorcraftApp) -> bool {
 fn simplify_dialog_sends_corner_angle_and_straight_lines() {
     let (ctx, mut app) = (ctx(), app_with_selection());
     app.run("shape.ellipse", json!({"x": 100, "y": 200, "width": 160, "height": 90})).unwrap();
-    crate::menus::invoke(&mut app, "object.path.simplify", json!({}));
+    open_simplify_dialog(&mut app);
     settle(&ctx, &mut app);
     let texts = frame(&ctx, &mut app, vec![]);
     assert!(texts.iter().any(|(t, _)| t == "Corner Point Angle Threshold:"), "{texts:?}");
@@ -407,7 +575,7 @@ fn simplify_dialog_corner_point_angle_threshold_keeps_or_smooths_corners() {
     let (ctx, mut app) = (ctx(), app_with_selection());
     app.run("edit.clear", json!({})).unwrap();
     app.run("shape.polygon", json!({"cx": 200, "cy": 200, "radius": 100, "sides": 8})).unwrap();
-    crate::menus::invoke(&mut app, "object.path.simplify", json!({}));
+    open_simplify_dialog(&mut app);
     app.ui.dialog.as_mut().unwrap().fields.insert("tolerance".into(), json!("10 pt"));
     settle(&ctx, &mut app);
     assert!(only_straight_segments(&app), "the corners stay and the sides stay straight");
@@ -426,7 +594,7 @@ fn simplify_dialog_show_original_path_outlines_the_paths_before_the_preview() {
         Some((id, vectorcraft_doc::NodeKind::Path { path, .. })) => (id, path.clone()),
         _ => panic!("a path is selected"),
     };
-    crate::menus::invoke(&mut app, "object.path.simplify", json!({}));
+    open_simplify_dialog(&mut app);
     settle(&ctx, &mut app);
     let texts = frame(&ctx, &mut app, vec![]);
     assert!(super::path_ops::original_paths(&app).is_empty(), "Show Original Path is off as the dialog opens");
diff --git a/crates/ui-egui/src/i18n/bg.tsv b/crates/ui-egui/src/i18n/bg.tsv
index 6a806e588..0463a5c5b 100644
--- a/crates/ui-egui/src/i18n/bg.tsv
+++ b/crates/ui-egui/src/i18n/bg.tsv
@@ -2868,6 +2868,8 @@
 	Show Note	Показване на бележка
 	Show Options	Показване на опциите
 	Show Original Path	Показване на оригиналния път
+	Open this dialog with these settings next time	Отваряне на този прозорец с тези настройки следващия път
+	Auto-Simplify	Автоматично опростяване
 	Show Package	Показване на пакет
 	Show Panel	Показване на панел
 	Show Pattern Swatches	Показване на образци за мостра
diff --git a/crates/ui-egui/src/i18n/cs.tsv b/crates/ui-egui/src/i18n/cs.tsv
index d1bc56c97..24eff57a0 100644
--- a/crates/ui-egui/src/i18n/cs.tsv
+++ b/crates/ui-egui/src/i18n/cs.tsv
@@ -1712,6 +1712,8 @@ lighting	Light	Světlo
 	Corner Point Angle Threshold:	Prahový úhel rohových bodů:
 	Convert to Straight Lines	Převést na přímé čáry
 	Show Original Path	Zobrazit původní cestu
+	Open this dialog with these settings next time	Příště otevřít toto dialogové okno s tímto nastavením
+	Auto-Simplify	Automaticky zjednodušit
 	Transparency Options	Možnosti průhlednosti
 	Color Mixer (Shift-click the chip)	Míchání barev (Shift+kliknutí na políčko)
 	Fill: click for swatches, Shift-click for the color mixer	Výplň: kliknutím otevřete vzorník, Shift+kliknutím míchání barev
@@ -4173,6 +4175,7 @@ imageTrace	Outline	Obrys
 @msg	background {other}: transparent, white, black or a colour such as "#ff8800"	pozadí {other}: transparent, white, black nebo barva jako "#ff8800"
 @msg	bad color {v}	chybná barva {v}
 @msg	the Color Picker is not open	Výběr barvy není otevřený
+@msg	the Simplify slider is not open	Posuvník Zjednodušit není otevřený
 @msg	the screen color sampler is already open	nástroj pro nabírání barvy z obrazovky už je otevřený
 @msg	this system has no screen color sampler	tento systém nemá nástroj pro nabírání barvy z obrazovky
 @msg	bad colour `{hex}` (#rrggbb)	chybná barva `{hex}` (#rrggbb)
diff --git a/crates/ui-egui/src/i18n/da.tsv b/crates/ui-egui/src/i18n/da.tsv
index 0018279a2..ccd3bbb15 100644
--- a/crates/ui-egui/src/i18n/da.tsv
+++ b/crates/ui-egui/src/i18n/da.tsv
@@ -5052,6 +5052,8 @@ swatch	Bright Violet	Kraftig violet
 	Outline Object	Objekt til kontur
 	Update Selection	Opdater markering
 	Show Original Path	Vis oprindelig kurve
+	Open this dialog with these settings next time	Åbn denne dialogboks med disse indstillinger næste gang
+	Auto-Simplify	Forenkl automatisk
 @msg	check a layer to export	markér et lag, der skal eksporteres
 @msg	select the art to export first	markér først grafikken, der skal eksporteres
 @msg	no saved selection recalled	ingen gemt markering hentet
diff --git a/crates/ui-egui/src/i18n/de.tsv b/crates/ui-egui/src/i18n/de.tsv
index c3e70abf6..3a1415c3b 100644
--- a/crates/ui-egui/src/i18n/de.tsv
+++ b/crates/ui-egui/src/i18n/de.tsv
@@ -2907,6 +2907,8 @@ mark-style	Japanese	Japanisch
 	Show Note	Notiz einblenden
 	Show Options	Optionen einblenden
 	Show Original Path	Originalpfad einblenden
+	Open this dialog with these settings next time	Dieses Dialogfeld nächstes Mal mit diesen Einstellungen öffnen
+	Auto-Simplify	Automatisch vereinfachen
 	Color Panel Options	Optionen für das Farbbedienfeld
 	Show Package	Paket anzeigen
 	Show Panel	Bedienfeld einblenden
@@ -3808,6 +3810,7 @@ theme	Appearance	Erscheinungsbild
 @msg	background {other}: transparent, white, black or a colour such as "#ff8800"	background {other}: transparent, white, black oder eine Farbe wie "#ff8800"
 @msg	bad color {v}	ungültige Farbe {v}
 @msg	the Color Picker is not open	der Farbwähler ist nicht geöffnet
+@msg	the Simplify slider is not open	der Regler „Vereinfachen“ ist nicht geöffnet
 @msg	the screen color sampler is already open	die Farbaufnahme vom Bildschirm ist bereits geöffnet
 @msg	this system has no screen color sampler	dieses System hat keine Farbaufnahme vom Bildschirm
 @msg	bad colour `{hex}` (#rrggbb)	ungültige Farbe `{hex}` (#rrggbb)
diff --git a/crates/ui-egui/src/i18n/el.tsv b/crates/ui-egui/src/i18n/el.tsv
index 9de4765c7..00ef5d15d 100644
--- a/crates/ui-egui/src/i18n/el.tsv
+++ b/crates/ui-egui/src/i18n/el.tsv
@@ -3325,6 +3325,8 @@ theme	Appearance	Εμφάνιση
 	Show Note	Εμφάνιση σημείωσης
 	Show Options	Εμφάνιση επιλογών
 	Show Original Path	Εμφάνιση αρχικής διαδρομής
+	Open this dialog with these settings next time	Άνοιγμα αυτού του παραθύρου με αυτές τις ρυθμίσεις την επόμενη φορά
+	Auto-Simplify	Αυτόματη απλοποίηση
 	Show Package	Εμφάνιση συσκευασίας
 	Show Panel	Εμφάνιση πίνακα
 	Show Pattern Swatches	Εμφάνιση δειγμάτων μοτίβου
@@ -5113,6 +5115,7 @@ effect	Points	Σημεία
 @msg	span: "selection" places a linear or radial gradient, not a freeform one	span: το "selection" τοποθετεί γραμμικό ή ακτινικό ντεγκραντέ, όχι ελεύθερης μορφής
 @msg	span: "selection" places the gradient itself: leave out `start` and `end` (they already place it in document coordinates)	span: το "selection" τοποθετεί το ίδιο το ντεγκραντέ: παραλείψτε τα `start` και `end` (το τοποθετούν ήδη σε συντεταγμένες εγγράφου)
 @msg	the Color Picker is not open	ο επιλογέας χρώματος δεν είναι ανοιχτός
+@msg	the Simplify slider is not open	ο ρυθμιστής Απλοποίησης δεν είναι ανοιχτός
 @msg	the action has no steps	η ενέργεια δεν έχει βήματα
 @msg	the file's layers weren't read ({_1}): it comes in as its page, in one layer	τα επίπεδα του αρχείου δεν διαβάστηκαν ({_1}): εισάγεται ως η σελίδα του, σε ένα επίπεδο
 @msg	the file's layers weren't read from its editing data ({_1}): they come from its PDF part	τα επίπεδα του αρχείου δεν διαβάστηκαν από τα δεδομένα επεξεργασίας του ({_1}): προέρχονται από το τμήμα PDF του
diff --git a/crates/ui-egui/src/i18n/es.tsv b/crates/ui-egui/src/i18n/es.tsv
index 388d9c836..51a0e228d 100644
--- a/crates/ui-egui/src/i18n/es.tsv
+++ b/crates/ui-egui/src/i18n/es.tsv
@@ -2925,6 +2925,8 @@
 	Show Note	Mostrar nota
 	Show Options	Mostrar opciones
 	Show Original Path	Mostrar trazado original
+	Open this dialog with these settings next time	Abrir este cuadro de diálogo con estos ajustes la próxima vez
+	Auto-Simplify	Simplificar automáticamente
 	Color Panel Options	Opciones del panel Color
 	Show Package	Mostrar paquete
 	Show Panel	Mostrar panel
@@ -3871,6 +3873,7 @@ axis	Both	Ambos
 @msg	background {other}: transparent, white, black or a colour such as "#ff8800"	fondo {other}: transparent, white, black o un color como "#ff8800"
 @msg	bad color {v}	color no válido {v}
 @msg	the Color Picker is not open	el Selector de color no está abierto
+@msg	the Simplify slider is not open	el regulador de Simplificar no está abierto
 @msg	the screen color sampler is already open	el muestreador de color de la pantalla ya está abierto
 @msg	this system has no screen color sampler	este sistema no tiene muestreador de color de la pantalla
 @msg	bad colour `{hex}` (#rrggbb)	color no válido `{hex}` (#rrggbb)
diff --git a/crates/ui-egui/src/i18n/fi.tsv b/crates/ui-egui/src/i18n/fi.tsv
index 261995f62..1a39413b3 100644
--- a/crates/ui-egui/src/i18n/fi.tsv
+++ b/crates/ui-egui/src/i18n/fi.tsv
@@ -1675,6 +1675,8 @@ lighting	Light	Valo
 	Corner Point Angle Threshold:	Kulmapisteiden kulmakynnys:
 	Convert to Straight Lines	Muunna suoriksi viivoiksi
 	Show Original Path	Näytä alkuperäinen polku
+	Open this dialog with these settings next time	Avaa tämä valintaikkuna näillä asetuksilla ensi kerralla
+	Auto-Simplify	Yksinkertaista automaattisesti
 	Transparency Options	Läpinäkyvyysasetukset
 	Color Mixer (Shift-click the chip)	Värisekoitin (Vaihto-napsauta värilaattaa)
 	Fill: click for swatches, Shift-click for the color mixer	Täyttö: napsauta avataksesi värimallit, Vaihto-napsauta avataksesi värisekoittimen
@@ -5125,6 +5127,7 @@ mark-style	Japanese	Japanilainen
 @msg	span: "selection" places a linear or radial gradient, not a freeform one	span: "selection" sijoittaa lineaarisen tai säteittäisen liukuvärin, ei vapaamuotoista
 @msg	span: "selection" places the gradient itself: leave out `start` and `end` (they already place it in document coordinates)	span: "selection" sijoittaa itse liukuvärin: jätä pois `start` ja `end` (ne sijoittavat sen jo asiakirjan koordinaatteihin)
 @msg	the Color Picker is not open	värinvalitsin ei ole auki
+@msg	the Simplify slider is not open	Yksinkertaista-liukusäädin ei ole auki
 @msg	the action has no steps	toiminnossa ei ole vaiheita
 @msg	the file's layers weren't read ({_1}): it comes in as its page, in one layer	tiedoston tasoja ei luettu ({_1}): se tuodaan sivunaan yhdelle tasolle
 @msg	the file's layers weren't read from its editing data ({_1}): they come from its PDF part	tiedoston tasoja ei luettu sen muokkaustiedoista ({_1}): ne tulevat sen PDF-osasta
diff --git a/crates/ui-egui/src/i18n/fr.tsv b/crates/ui-egui/src/i18n/fr.tsv
index 52e6fd3f2..ee29bfdb8 100644
--- a/crates/ui-egui/src/i18n/fr.tsv
+++ b/crates/ui-egui/src/i18n/fr.tsv
@@ -2922,6 +2922,8 @@
 	Show Note	Afficher la note
 	Show Options	Afficher les options
 	Show Original Path	Afficher le tracé d’origine
+	Open this dialog with these settings next time	Ouvrir cette boîte de dialogue avec ces réglages la prochaine fois
+	Auto-Simplify	Simplifier automatiquement
 	Color Panel Options	Options du panneau Couleur
 	Show Package	Afficher le dossier d’assemblage
 	Show Panel	Afficher le panneau
@@ -3868,6 +3870,7 @@ axis	Both	Les deux
 @msg	background {other}: transparent, white, black or a colour such as "#ff8800"	arrière-plan {other} : transparent, white, black ou une couleur comme "#ff8800"
 @msg	bad color {v}	couleur non valide {v}
 @msg	the Color Picker is not open	le Sélecteur de couleurs n’est pas ouvert
+@msg	the Simplify slider is not open	le curseur Simplifier n’est pas ouvert
 @msg	the screen color sampler is already open	l’outil de prélèvement de couleur à l’écran est déjà ouvert
 @msg	this system has no screen color sampler	ce système n’a pas d’outil de prélèvement de couleur à l’écran
 @msg	bad colour `{hex}` (#rrggbb)	couleur non valide `{hex}` (#rrggbb)
diff --git a/crates/ui-egui/src/i18n/hu.tsv b/crates/ui-egui/src/i18n/hu.tsv
index 0d0a1e642..7efcd179a 100644
--- a/crates/ui-egui/src/i18n/hu.tsv
+++ b/crates/ui-egui/src/i18n/hu.tsv
@@ -3543,6 +3543,8 @@ mark-style	Japanese	Japán
 	Show Note	Megjegyzés megjelenítése
 	Show Options	Beállítások megjelenítése
 	Show Original Path	Eredeti útvonal megjelenítése
+	Open this dialog with these settings next time	Legközelebb ez a párbeszédablak nyíljon meg ezekkel a beállításokkal
+	Auto-Simplify	Automatikus egyszerűsítés
 	Color Panel Options	Szín panel beállításai
 	Show Package	Csomag megjelenítése
 	Show Panel	Panel megjelenítése
@@ -4414,6 +4416,7 @@ imageTrace	Outline	Körvonal
 @msg	background {other}: transparent, white, black or a colour such as "#ff8800"	background {other}: transparent, white, black vagy egy szín, például "#ff8800"
 @msg	bad color {v}	hibás szín: {v}
 @msg	the Color Picker is not open	a Színválasztó nincs megnyitva
+@msg	the Simplify slider is not open	az Egyszerűsítés csúszka nincs megnyitva
 @msg	the screen color sampler is already open	a képernyős színmintavevő már nyitva van
 @msg	this system has no screen color sampler	ezen a rendszeren nincs képernyős színmintavevő
 @msg	bad colour `{hex}` (#rrggbb)	hibás szín: `{hex}` (#rrggbb)
diff --git a/crates/ui-egui/src/i18n/id.tsv b/crates/ui-egui/src/i18n/id.tsv
index 65190ac24..c40f656b8 100644
--- a/crates/ui-egui/src/i18n/id.tsv
+++ b/crates/ui-egui/src/i18n/id.tsv
@@ -5052,6 +5052,8 @@ swatch	Bright Violet	Violet cerah
 	Outline Object	Kerangka objek
 	Update Selection	Perbarui seleksi
 	Show Original Path	Tampilkan jalur asli
+	Open this dialog with these settings next time	Buka dialog ini dengan pengaturan ini lain kali
+	Auto-Simplify	Sederhanakan otomatis
 @msg	check a layer to export	centang lapisan yang akan diekspor
 @msg	select the art to export first	pilih dulu karya yang akan diekspor
 @msg	no saved selection recalled	tidak ada seleksi tersimpan yang dipanggil
diff --git a/crates/ui-egui/src/i18n/it.tsv b/crates/ui-egui/src/i18n/it.tsv
index 6e99dcab4..b58ee8829 100644
--- a/crates/ui-egui/src/i18n/it.tsv
+++ b/crates/ui-egui/src/i18n/it.tsv
@@ -2958,6 +2958,8 @@ mark-style	Japanese	Giapponese
 	Show Note	Mostra nota
 	Show Options	Mostra opzioni
 	Show Original Path	Mostra tracciato originale
+	Open this dialog with these settings next time	Apri questa finestra di dialogo con queste impostazioni la prossima volta
+	Auto-Simplify	Semplifica automaticamente
 	Color Panel Options	Opzioni pannello Colore
 	Show Package	Mostra pacchetto
 	Show Panel	Mostra pannello
@@ -3910,6 +3912,7 @@ axis	Both	Entrambi
 @msg	background {other}: transparent, white, black or a colour such as "#ff8800"	sfondo {other}: transparent, white, black o un colore come "#ff8800"
 @msg	bad color {v}	colore non valido {v}
 @msg	the Color Picker is not open	il Selettore colore non è aperto
+@msg	the Simplify slider is not open	il cursore Semplifica non è aperto
 @msg	the screen color sampler is already open	il campionatore di colore dello schermo è già aperto
 @msg	this system has no screen color sampler	questo sistema non ha un campionatore di colore dello schermo
 @msg	bad colour `{hex}` (#rrggbb)	colore non valido `{hex}` (#rrggbb)
diff --git a/crates/ui-egui/src/i18n/ja.tsv b/crates/ui-egui/src/i18n/ja.tsv
index f980b2373..2574cf77d 100644
--- a/crates/ui-egui/src/i18n/ja.tsv
+++ b/crates/ui-egui/src/i18n/ja.tsv
@@ -2766,6 +2766,8 @@ mark-style	Japanese	日本式
 	Show Note	メモを表示
 	Show Options	オプションを表示
 	Show Original Path	元のパスを表示
+	Open this dialog with these settings next time	次回はこの設定でこのダイアログを開く
+	Auto-Simplify	自動単純化
 	Color Panel Options	カラーパネルオプション
 	Show Package	パッケージを表示
 	Show Panel	パネルを表示
@@ -4225,6 +4227,7 @@ swatch	Bright Violet	ビビッドバイオレット
 @msg	no blend options	ブレンドオプションがありません
 @msg	bad color {v}	カラー {v} が正しくありません
 @msg	the Color Picker is not open	カラーピッカーが開いていません
+@msg	the Simplify slider is not open	単純化スライダーが開いていません
 @msg	the screen color sampler is already open	画面のカラーサンプラーはすでに開いています
 @msg	this system has no screen color sampler	このシステムには画面のカラーサンプラーがありません
 @msg	Corners edits the corners of a path	「コーナー」で編集できるのはパスの角だけです
diff --git a/crates/ui-egui/src/i18n/ka.tsv b/crates/ui-egui/src/i18n/ka.tsv
index 0538b0fd2..0983dea21 100644
--- a/crates/ui-egui/src/i18n/ka.tsv
+++ b/crates/ui-egui/src/i18n/ka.tsv
@@ -4756,6 +4756,7 @@ imageTrace	Outline	კონტური
 @msg	the file's layers weren't read ({_1}): it comes in as its page, in one layer	ფაილის შრეები ვერ წაიკითხა ({_1}): ის გაიხსნება როგორც მისი გვერდი, ერთ შრეში
 @msg	the file's layers weren't read from its editing data ({_1}): they come from its PDF part	ფაილის შრეები რედაქტირების მონაცემებიდან ვერ წაიკითხა ({_1}): ისინი მისი PDF ნაწილიდან აიღება
 @msg	the Color Picker is not open	ფერის ამრჩევი გახსნილი არ არის
+@msg	the Simplify slider is not open	გამარტივების სლაიდერი გახსნილი არ არის
 @msg	the screen color sampler is already open	ეკრანიდან ფერის აღება უკვე გახსნილია
 @msg	this system has no screen color sampler	ამ სისტემას ეკრანიდან ფერის აღების საშუალება არ აქვს
 # Dimension tool and Object › Dimensions. A drafting dimension is ზომა (ზომის დასმა), like a dimension on a technical drawing.
@@ -4899,6 +4900,8 @@ imageTrace	Outline	კონტური
 	Rotate View to Selection	ხედის შემობრუნება მონიშნულის მიხედვით
 	Update Selection	მონიშნულის განახლება
 	Show Original Path	საწყისი ტრაექტორიის ჩვენება
+	Open this dialog with these settings next time	შემდეგ ჯერზე ამ დიალოგის ამ პარამეტრებით გახსნა
+	Auto-Simplify	ავტომატური გამარტივება
 	Texture Image	ტექსტურის გამოსახულება
 @msg	check a layer to export	მონიშნეთ საექსპორტო შრე
 @msg	select the art to export first	ჯერ მონიშნეთ საექსპორტო ნახატი
diff --git a/crates/ui-egui/src/i18n/ko.tsv b/crates/ui-egui/src/i18n/ko.tsv
index 144b1821f..5e32fdc74 100644
--- a/crates/ui-egui/src/i18n/ko.tsv
+++ b/crates/ui-egui/src/i18n/ko.tsv
@@ -2760,6 +2760,8 @@ mark-style	Japanese	일본식
 	Show Note	메모 표시
 	Show Options	옵션 표시
 	Show Original Path	원래 패스 표시
+	Open this dialog with these settings next time	다음에 이 설정으로 이 대화상자 열기
+	Auto-Simplify	자동 단순화
 	Color Panel Options	색상 패널 옵션
 	Show Package	패키지 표시
 	Show Panel	패널 표시
@@ -4157,6 +4159,7 @@ theme	Appearance	외관
 @msg	no blend options	혼합 옵션이 없습니다
 @msg	bad color {v}	잘못된 색상 {v}
 @msg	the Color Picker is not open	색상 피커가 열려 있지 않습니다
+@msg	the Simplify slider is not open	단순화 슬라이더가 열려 있지 않습니다
 @msg	the screen color sampler is already open	화면 색상 추출기가 이미 열려 있습니다
 @msg	this system has no screen color sampler	이 시스템에는 화면 색상 추출기가 없습니다
 @msg	Corners edits the corners of a path	모퉁이는 패스의 모퉁이를 편집합니다
diff --git a/crates/ui-egui/src/i18n/nl.tsv b/crates/ui-egui/src/i18n/nl.tsv
index 915e0d510..029de3772 100644
--- a/crates/ui-egui/src/i18n/nl.tsv
+++ b/crates/ui-egui/src/i18n/nl.tsv
@@ -5064,6 +5064,8 @@ swatch	Bright Violet	Felviolet
 	Outline Object	Object omtrekken
 	Update Selection	Selectie bijwerken
 	Show Original Path	Oorspronkelijk pad tonen
+	Open this dialog with these settings next time	Dit dialoogvenster de volgende keer met deze instellingen openen
+	Auto-Simplify	Automatisch vereenvoudigen
 @msg	check a layer to export	vink een laag aan om te exporteren
 @msg	select the art to export first	selecteer eerst de illustratie die je wilt exporteren
 @msg	no saved selection recalled	geen opgeslagen selectie opgeroepen
diff --git a/crates/ui-egui/src/i18n/pl.tsv b/crates/ui-egui/src/i18n/pl.tsv
index c66142993..761668208 100644
--- a/crates/ui-egui/src/i18n/pl.tsv
+++ b/crates/ui-egui/src/i18n/pl.tsv
@@ -1632,6 +1632,8 @@ lighting	Light	Światło
 	Corner Point Angle Threshold:	Próg kąta punktów narożnych:
 	Convert to Straight Lines	Konwertuj na linie proste
 	Show Original Path	Pokaż oryginalną ścieżkę
+	Open this dialog with these settings next time	Następnym razem otwórz to okno dialogowe z tymi ustawieniami
+	Auto-Simplify	Uprość automatycznie
 	Transparency Options	Opcje przezroczystości
 	Color Mixer (Shift-click the chip)	Mikser kolorów (kliknij próbkę z Shift)
 	Fill: click for swatches, Shift-click for the color mixer	Wypełnienie: kliknij, aby wybrać próbkę, z Shift — mikser kolorów
@@ -3995,6 +3997,7 @@ imageTrace	Outline	Kontur
 @msg	background {other}: transparent, white, black or a colour such as "#ff8800"	tło {other}: transparent, white, black lub kolor, np. "#ff8800"
 @msg	bad color {v}	nieprawidłowy kolor {v}
 @msg	the Color Picker is not open	Próbnik kolorów nie jest otwarty
+@msg	the Simplify slider is not open	Suwak Uprość nie jest otwarty
 @msg	the screen color sampler is already open	narzędzie do pobierania koloru z ekranu jest już otwarte
 @msg	this system has no screen color sampler	ten system nie ma narzędzia do pobierania koloru z ekranu
 @msg	bad colour `{hex}` (#rrggbb)	nieprawidłowy kolor `{hex}` (#rrggbb)
diff --git a/crates/ui-egui/src/i18n/pt-br.tsv b/crates/ui-egui/src/i18n/pt-br.tsv
index e33d25c37..000edc398 100644
--- a/crates/ui-egui/src/i18n/pt-br.tsv
+++ b/crates/ui-egui/src/i18n/pt-br.tsv
@@ -2430,6 +2430,8 @@
 	Show Note	Mostrar Nota
 	Show Options	Mostrar Opções
 	Show Original Path	Mostrar Caminho Original
+	Open this dialog with these settings next time	Abrir este diálogo com estas configurações na próxima vez
+	Auto-Simplify	Simplificar Automaticamente
 	Show Package	Mostrar Pacote
 	Show Panel	Mostrar Painel
 	Show Perspective Grid	Mostrar Grade de Perspectiva
@@ -5068,6 +5070,7 @@ mark-style	Japanese	Japonesas
 @msg	Unknown dimension mode	Modo de cota desconhecido
 @msg	Unknown dimension option {k}	Opção de cota desconhecida {k}
 @msg	the Color Picker is not open	o Seletor de Cores não está aberto
+@msg	the Simplify slider is not open	o controle deslizante Simplificar não está aberto
 @msg	the screen color sampler is already open	o coletor de cores da tela já está aberto
 @msg	this system has no screen color sampler	este sistema não tem coletor de cores da tela
 	Darkness	Escuridão
diff --git a/crates/ui-egui/src/i18n/ru.tsv b/crates/ui-egui/src/i18n/ru.tsv
index c03d830ba..f16262257 100644
--- a/crates/ui-egui/src/i18n/ru.tsv
+++ b/crates/ui-egui/src/i18n/ru.tsv
@@ -2954,6 +2954,8 @@ mark-style	Japanese	Японский
 	Show Note	Показать примечание
 	Show Options	Показать параметры
 	Show Original Path	Показать исходный контур
+	Open this dialog with these settings next time	Открывать это диалоговое окно с этими параметрами в следующий раз
+	Auto-Simplify	Автоматическое упрощение
 	Color Panel Options	Параметры панели «Цвет»
 	Show Package	Показать пакет
 	Show Panel	Показать панель
@@ -3906,6 +3908,7 @@ axis	Both	Оба
 @msg	background {other}: transparent, white, black or a colour such as "#ff8800"	фон {other}: transparent, white, black или цвет, например "#ff8800"
 @msg	bad color {v}	недопустимый цвет {v}
 @msg	the Color Picker is not open	палитра цветов не открыта
+@msg	the Simplify slider is not open	ползунок «Упростить» не открыт
 @msg	the screen color sampler is already open	средство выбора цвета с экрана уже открыто
 @msg	this system has no screen color sampler	в этой системе нет средства выбора цвета с экрана
 @msg	bad colour `{hex}` (#rrggbb)	недопустимый цвет `{hex}` (#rrggbb)
diff --git a/crates/ui-egui/src/i18n/sv.tsv b/crates/ui-egui/src/i18n/sv.tsv
index 05144a79f..aad98ba73 100644
--- a/crates/ui-egui/src/i18n/sv.tsv
+++ b/crates/ui-egui/src/i18n/sv.tsv
@@ -2868,6 +2868,8 @@
 	Show Note	Visa anteckning
 	Show Options	Visa alternativ
 	Show Original Path	Visa ursprunglig bana
+	Open this dialog with these settings next time	Öppna den här dialogrutan med de här inställningarna nästa gång
+	Auto-Simplify	Förenkla automatiskt
 	Show Package	Visa paket
 	Show Panel	Visa panel
 	Show Pattern Swatches	Visa mönsterprover
@@ -5117,6 +5119,7 @@ theme	Appearance	Utseende
 @msg	span: "selection" places a linear or radial gradient, not a freeform one	span: "selection" placerar en linjär eller radiell övertoning, inte en fri
 @msg	span: "selection" places the gradient itself: leave out `start` and `end` (they already place it in document coordinates)	span: "selection" placerar själva övertoningen: utelämna `start` och `end` (de placerar den redan i dokumentkoordinater)
 @msg	the Color Picker is not open	färgväljaren är inte öppen
+@msg	the Simplify slider is not open	Förenkla-reglaget är inte öppet
 @msg	the action has no steps	åtgärden har inga steg
 @msg	the file's layers weren't read ({_1}): it comes in as its page, in one layer	filens lager lästes inte ({_1}): den hämtas in som en sida, i ett enda lager
 @msg	the file's layers weren't read from its editing data ({_1}): they come from its PDF part	filens lager lästes inte från dess redigeringsdata ({_1}): de kommer från dess PDF-del
diff --git a/crates/ui-egui/src/i18n/uk.tsv b/crates/ui-egui/src/i18n/uk.tsv
index 5474578d5..0d6728339 100644
--- a/crates/ui-egui/src/i18n/uk.tsv
+++ b/crates/ui-egui/src/i18n/uk.tsv
@@ -2950,6 +2950,8 @@ mark-style	Japanese	Японський
 	Show Note	Показати примітку
 	Show Options	Показати параметри
 	Show Original Path	Показати початковий контур
+	Open this dialog with these settings next time	Наступного разу відкривати це діалогове вікно з цими параметрами
+	Auto-Simplify	Автоматичне спрощення
 	Color Panel Options	Параметри панелі «Колір»
 	Show Package	Показати пакет
 	Show Panel	Показати панель
@@ -3894,6 +3896,7 @@ axis	Both	Обидві
 @msg	background {other}: transparent, white, black or a colour such as "#ff8800"	фон {other}: transparent, white, black або колір, наприклад "#ff8800"
 @msg	bad color {v}	неприпустимий колір {v}
 @msg	the Color Picker is not open	палітра кольорів не відкрита
+@msg	the Simplify slider is not open	повзунок «Спростити» не відкрито
 @msg	the screen color sampler is already open	засіб вибору кольору з екрана вже відкритий
 @msg	this system has no screen color sampler	у цій системі немає засобу вибору кольору з екрана
 @msg	bad colour `{hex}` (#rrggbb)	неприпустимий колір `{hex}` (#rrggbb)
diff --git a/crates/ui-egui/src/i18n/vi.tsv b/crates/ui-egui/src/i18n/vi.tsv
index 7249d1899..917ec4ed8 100644
--- a/crates/ui-egui/src/i18n/vi.tsv
+++ b/crates/ui-egui/src/i18n/vi.tsv
@@ -3283,6 +3283,8 @@ mark-style	Japanese	Kiểu Nhật
 	Show Note	Hiện ghi chú
 	Show Options	Hiện tùy chọn
 	Show Original Path	Hiện đường dẫn gốc
+	Open this dialog with these settings next time	Lần sau mở hộp thoại này với các cài đặt này
+	Auto-Simplify	Tự động đơn giản hóa
 	Color Panel Options	Tùy chọn bảng màu
 	Show Package	Hiện gói
 	Show Panel	Hiện bảng
@@ -4062,6 +4064,7 @@ theme	Appearance	Giao diện
 @msg	background {other}: transparent, white, black or a colour such as "#ff8800"	background {other}: transparent, white, black hoặc màu như "#ff8800"
 @msg	bad color {v}	màu không hợp lệ {v}
 @msg	the Color Picker is not open	Bộ chọn màu chưa được mở
+@msg	the Simplify slider is not open	Thanh trượt Đơn giản hóa chưa được mở
 @msg	the screen color sampler is already open	công cụ lấy mẫu màu trên màn hình đã được mở
 @msg	this system has no screen color sampler	hệ thống này không có công cụ lấy mẫu màu trên màn hình
 @msg	bad colour `{hex}` (#rrggbb)	màu không hợp lệ `{hex}` (#rrggbb)
diff --git a/crates/ui-egui/src/i18n/zh-hans.tsv b/crates/ui-egui/src/i18n/zh-hans.tsv
index bb2698ecd..6a628cff5 100644
--- a/crates/ui-egui/src/i18n/zh-hans.tsv
+++ b/crates/ui-egui/src/i18n/zh-hans.tsv
@@ -2809,6 +2809,8 @@ font-script	Japanese	汉字
 	Show Note	显示注解
 	Show Options	显示选项
 	Show Original Path	显示原始路径
+	Open this dialog with these settings next time	下次以这些设置打开此对话框
+	Auto-Simplify	自动简化
 	Color Panel Options	颜色面板选项
 	Show Package	显示打包
 	Show Panel	显示面板
@@ -3971,6 +3973,7 @@ imageTrace	Outline	轮廓
 @msg	no blend options	没有混合选项
 @msg	bad color {v}	颜色 {v} 无效
 @msg	the Color Picker is not open	拾色器未打开
+@msg	the Simplify slider is not open	简化滑块未打开
 @msg	the screen color sampler is already open	屏幕取色器已打开
 @msg	this system has no screen color sampler	此系统没有屏幕取色器
 @msg	Corners edits the corners of a path	转角用于编辑路径的转角
diff --git a/crates/ui-egui/src/i18n/zh-hant.tsv b/crates/ui-egui/src/i18n/zh-hant.tsv
index a3c1948b2..6da1f726f 100644
--- a/crates/ui-egui/src/i18n/zh-hant.tsv
+++ b/crates/ui-egui/src/i18n/zh-hant.tsv
@@ -1979,6 +1979,7 @@ file-filter	Templates	範本
 @msg	no blend options	沒有漸變選項
 @msg	bad color {v}	顏色 {v} 無效
 @msg	the Color Picker is not open	「顏色選擇器」未開啟
+@msg	the Simplify slider is not open	「簡化」滑桿未開啟
 @msg	the screen color sampler is already open	螢幕取色器已開啟
 @msg	this system has no screen color sampler	此系統沒有螢幕取色器
 @msg	Corners edits the corners of a path	「轉角」用於編輯路徑的轉角
@@ -3676,6 +3677,8 @@ font-script	Japanese	漢字
 	Show Note	顯示註解
 	Show Options	顯示選項
 	Show Original Path	顯示原始路徑
+	Open this dialog with these settings next time	下次以這些設定開啟此對話方塊
+	Auto-Simplify	自動簡化
 	Color Panel Options	顏色面板選項
 	Show Package	顯示封裝
 	Show Panel	顯示面板
diff --git a/crates/ui-egui/src/menus.rs b/crates/ui-egui/src/menus.rs
index 26f3db982..19d02a806 100644
--- a/crates/ui-egui/src/menus.rs
+++ b/crates/ui-egui/src/menus.rs
@@ -666,6 +666,18 @@ pub const UI_COMMANDS: &[(&str, &str, &str, &str)] = &[
         "",
         "{id?, corners?: [i…]} open Corners for path `id` (default: the selected one) and its corners (anchor indices of the path with its corners uncut, as object.setLiveShape takes them: a rectangle's 0 top-left, 1 top-right, 2 bottom-right, 3 bottom-left; default: the Direct-Selected corners, else every corner) (dialog `corners`: kind (round|invertedRound|chamfer), radius (pt); double-clicking a corner widget opens it too): OK runs object.setLiveShape",
     ),
+    (
+        "ui.simplifyAuto",
+        "Auto-Simplify",
+        "",
+        "{} the open Simplify slider (Object › Path › Simplify opens it: dialog `simplifySlider` with field `level` 0..100, object.path.simplify's level, 50 as it opens, previewed on the canvas until ui.dialog.confirm keeps it as one undo step; after OK in the Simplify dialog with `retain` ticked, the menu item opens the dialog `simplify` with the fields of that OK instead) moves to the level object.path.simplify {auto: true} picks for the selection and previews it → {level}; an error when the slider isn't open",
+    ),
+    (
+        "ui.simplifyMoreOptions",
+        "More Options",
+        "",
+        "{} the Simplify dialog (dialog `simplify`: tolerance (pt), angleThreshold, straightLines, showOriginal, retain: ticked, OK makes Object › Path › Simplify open this dialog with these fields next time) takes the open Simplify slider's place, at the slider's tolerance → {tolerance}; an error when the slider isn't open",
+    ),
     (
         "ui.justification",
         "Justification…",
@@ -1583,6 +1595,8 @@ pub fn run_ui_command(app: &mut VectorcraftApp, id: &str, p: &Value) -> Option<R
             None => Err("no such user library".into()),
         },
         "ui.expandDialog" => crate::dialogs::expand::open(app),
+        "ui.simplifyAuto" => crate::dialogs::simplify_slider::auto(app),
+        "ui.simplifyMoreOptions" => crate::dialogs::simplify_slider::more_options(app),
         "attributes.openUrl" => crate::panels::attributes::open_url(app, p),
         "ui.javascriptFilesDialog" => crate::panels::svg_interactivity::files_dialog(app, p),
         "ui.spotColors" => crate::dialogs::spot_colors::open(app),
@@ -2292,6 +2306,7 @@ pub fn enabled(app: &VectorcraftApp, id: &str) -> bool {
         "ui.expandDialog" => app.session.active().is_some_and(|d| !d.selection.is_empty()),
         "ui.spotColors" => app.session.active().is_some(),
         "ui.menuDialog" => app.session.active().is_some_and(|d| !d.selection.is_empty()),
+        "ui.simplifyAuto" | "ui.simplifyMoreOptions" => crate::dialogs::simplify_slider::showing(app),
         "ui.dxfOptionsDialog" => app.session.active().is_some(),
         "links.editOriginal" | "links.reveal" => selected_image(app, |im| im.link.is_some()) || selected_placed(app),
         "ui.placementOptionsDialog" => selected_image(app, |_| true) || selected_placed(app),
@@ -3369,10 +3384,10 @@ fn menu_dialog(app: &VectorcraftApp, id: &str) -> Option<(&'static str, Value)>
         // Offset Path opens on the values it was last confirmed with.
         "object.path.offsetPath" if app.ui.offset_path.is_object() => ("offsetPath", app.ui.offset_path.clone()),
         "object.path.offsetPath" => ("offsetPath", json!({"offset": "10 pt", "joins": "miter", "miterLimit": 4})),
-        "object.path.simplify" => (
-            "simplify",
-            json!({"tolerance": "1 pt", "angleThreshold": crate::dialogs::path_ops::ANGLE_THRESHOLD, "straightLines": false, "showOriginal": false, "preview": true}),
-        ),
+        // Simplify opens its slider, or the dialog on the fields it was last confirmed with when
+        // "Open this dialog with these settings next time" was ticked.
+        "object.path.simplify" if app.ui.simplify.is_object() => ("simplify", app.ui.simplify.clone()),
+        "object.path.simplify" => (crate::dialogs::simplify_slider::KIND, crate::dialogs::simplify_slider::fields()),
         "object.path.splitIntoGrid" => {
             // The grid starts at the size of the selection.
             let size =
diff --git a/crates/ui-egui/src/state.rs b/crates/ui-egui/src/state.rs
index bd0134a94..e52d18eea 100644
--- a/crates/ui-egui/src/state.rs
+++ b/crates/ui-egui/src/state.rs
@@ -488,6 +488,11 @@ pub struct UiState {
     /// dialog opens on them (#1152).
     #[serde(default)]
     pub offset_path: Value,
+    /// The Simplify dialog's fields confirmed last with "Open this dialog with these settings next
+    /// time" ticked (null: not ticked): Object › Path › Simplify opens the dialog on them instead
+    /// of the Simplify slider.
+    #[serde(default)]
+    pub simplify: Value,
     /// The Move dialog's checkboxes as it was last confirmed with (copy, objects, preview; null:
     /// never used): it opens with them.
     #[serde(default)]
@@ -823,6 +828,7 @@ impl Default for UiState {
             dxf_options: Value::Null,
             eps_options: Value::Null,
             offset_path: Value::Null,
+            simplify: Value::Null,
             move_options: Value::Null,
             dxf_import: Value::Null,
             home: None,
diff --git a/docs/mcp.md b/docs/mcp.md
index 83d11b031..f69bc10ad 100644
--- a/docs/mcp.md
+++ b/docs/mcp.md
@@ -2024,6 +2024,23 @@ the path it had begun while that stays selected. Its reply's `tool` is the tool
 {"name":"run_command","arguments":{"command":"path.moveAnchors","params":{"dx":0,"dy":40}}}
 ```
 
+## Simplify
+
+`object.path.simplify` takes the amount as `tolerance` (points, 1 by default) or as the Simplify slider's `level`, a whole
+number from 0 (the fewest anchor points) to 100 (the closest fit). Level 50 is a tolerance of 1 pt, and every 10 levels
+halve or double it, so level 0 is 32 pt and level 100 is 1/32 pt. `auto: true` (Auto-Simplify) uses the lowest level
+whose tolerance is at most 1/400 of the selection's longer side, or level 100 when that side is under 12.5 pt. With
+`level` or `auto`, the reply also has the `level` used:
+
+```json
+{"name":"run_command","arguments":{"command":"object.path.simplify","params":{"auto":true}}}
+```
+
+In the desktop app, Object › Path › Simplify opens the slider (`ui.menuDialog {command: "object.path.simplify"}`,
+dialog `simplifySlider` with field `level`) and previews the result until `ui.dialog.confirm`. `ui.simplifyAuto` moves
+the open slider to the Auto-Simplify level, and `ui.simplifyMoreOptions` opens the Simplify dialog at the slider's
+tolerance. When OK confirms the dialog with `retain` ticked, the menu item opens the dialog on those settings next time.
+
 ## Editing a path with the Curvature tool
 
 The Curvature tool edits any selected path, whatever drew it, keeping its shape except where edited (#798). Each edit
diff --git a/docs/target-app-parity.md b/docs/target-app-parity.md
index 793c6265d..71ded065d 100644
--- a/docs/target-app-parity.md
+++ b/docs/target-app-parity.md
@@ -624,9 +624,10 @@ Moved from the ROADMAP's "Shipped so far" on 2026-10-10. Update it when a featur
   - Scribble (Effect › Stylize › Scribble…) has a Variation for each of Path Overlap, Curviness and Spacing ([Scribble options](https://helpx.adobe.com/illustrator/using/creating-sketches-mosaics.html)) (`overlapVariation`, `curvinessVariation`, `spacingVariation`), shown in its dialog and in the Appearance panel. A Scribble saved with the earlier single `variation` reads it as the Path Overlap and Spacing variations and draws as before. The angle is stored above -180° and up to 180°, so 270° is stored as -90°.
   - **Simplify feedback and component selection (#1272):** the existing tolerance dialog previews from the original interaction snapshot and shows original/new anchor counts. Preview off and Cancel restore the document and selection; OK is one Undo. A refit or Add Anchor Points clears component indexes only on paths whose geometry changes, keeping their objects selected whole and unchanged paths' components intact. Engine and real-egui frame regressions cover document/selection restoration and grouped paths.
     Public references: [Simplify benefits](https://helpx.adobe.com/illustrator/desktop/draw-shapes-and-paths/modify-paths/simplify-path-benefits.html) and [advanced options](https://helpx.adobe.com/illustrator/desktop/draw-shapes-and-paths/modify-paths/simplify-paths-advanced-options-overview.html).
-    Nearly unchanged appearance is expected when reducing points. Percentage/auto-simplify controls and Retain my latest settings are not implemented; the checklist is partial, without raising scores.
+    Nearly unchanged appearance is expected when reducing points. The checklist is partial, without raising scores.
     Simplify and Add Anchor Points record no undo step when they change no path, and a path they leave as it is keeps its live shape.
     The Simplify dialog also has Corner Point Angle Threshold, Convert to Straight Lines and Show Original Path. The threshold is a slider from 0° to 180° and opens at 150°: an anchor whose corner is sharper than the threshold stays a corner, so moving the slider right keeps more corners, and the dialog sends `cornerAngle` as 180° less the threshold. While Preview is on, Show Original Path draws the paths as they were before the preview in a wide, faint band of their layer's color under the selection's outlines.
+    Object › Path › Simplify opens a slider under the selection ([Manually simplify paths](https://helpx.adobe.com/illustrator/desktop/draw-shapes-and-paths/modify-paths/manually-simplify-paths.html), [Auto simplify paths](https://helpx.adobe.com/illustrator/desktop/draw-shapes-and-paths/modify-paths/auto-simplify-paths.html)) with Auto-Simplify, a rail from the fewest anchor points to the closest fit, and More Options, which opens the dialog at the slider's tolerance. The rail's levels are VectorCraft's own scale (`object.path.simplify {level}`): level 50, where the slider opens, is 1 pt, and every 10 levels halve or double the tolerance, from 32 pt at 0 to 1/32 pt at 100. Auto-Simplify picks the lowest level whose tolerance is at most 1/400 of the selection's longer side, or level 100 when that side is under 12.5 pt. The dialog's "Open this dialog with these settings next time" makes the menu item open the dialog on the settings of its last OK.
 - **Type:** Character size, leading, baseline shift and horizontal-scale controls account for object/group transforms (#1034): exact document-point sizes, mixed-value display and keyboard increments, range edits, resettable horizontal stretch, undo/redo and native save/reopen (`tests_typescale`, Character panel tests). Point size is the transformed em-height axis, independent of glyph ink bounds; affine rotation, reflection and shear are retained. Group scaling still scales text; preserving font sizes is a separate enhancement. Behaviour reference: [Transform text](https://helpx.adobe.com/illustrator/desktop/design-with-text/edit-format-text/transform-text.html) (public documentation). Text Wrap, Type on a Path effects (Rainbow/Skew/3D Ribbon/Stair Step/Gravity) and Options (Flip, Align to Path, Spacing; OK keeps the type where it is), type on a path's start, centre and end brackets (Selection and Direct Selection drag them to set where the type runs, slide it along its path and, across the path, flip it: #429), Character and Paragraph Styles (override-preserving redefine), paragraph attributes per paragraph (alignment, indents, spacing, hyphenation, hanging punctuation, tab stops, paragraph style, direction, mojikumi and leading model; the Paragraph, Tabs and Paragraph Styles panels act on the paragraphs the Type tool's selection or caret touches, Return continues the paragraph's style, threads and SVG keep them), Area Type Options (rows/columns/inset/first baseline, vertical Align Top/Center/Bottom/Justify per row/column, reflowing non-rectangular frames and text wrap), threaded text across any closed shapes, Fit Headline, the Every-line Composer for justified and ragged text (paragraph-wide breaks for an even rag, Single-line per object from the Paragraph panel menu or `text.setFormat {composer}`). Area type resizes like Illustrator's type areas: a bounding-box handle drag (Selection tool) or Area Type Options Width/Height size the frame and the text reflows at its size (threads too); Direct Selection drags a frame corner or edge (`text.reshapeArea`). Point type still scales. Auto Size: the frame height follows the text after every edit, in the same undo step (rectangular frames of horizontal type in one row; columns get the least height that holds them; a height set by hand or threading turns it off), and the "Auto Size New Area Type" preference gives it to new area type. Shrink Text to Fit (beyond Illustrator): overflowing area type scales its sizes, leading and baseline shifts down by the largest factor (in 0.1 pt steps of the first run, down to a minimum percentage) that fits, at layout time so every export sees it. `text.areaOptions` and `document.inspect` report overflow and the shrink factor. The Selection tool shows the type widget beside selected type's bounding box (hollow on point type, filled on area type); double-clicking it converts between them (Type › Convert To Area Type / Convert To Point Type), keeping the text and its styles in place. Cmd+Shift+C (Align center) works on Windows and Linux too (#1940). Variable fonts list every named instance as a style of their family (Figtree Light to Black and their italics, Bahnschrift, Segoe UI Variable), and the instance chosen is shaped, drawn, outlined and measured at its axis settings; PDF and SVG embed it as that instance. The Character panel's Variable Font sliders set each axis (see Fonts). Beyond Illustrator: inline graphics (`text.insertInline`, Type ▸ Insert Inline Symbol) set a document symbol in a run of type as one character that flows, wraps and justifies like a glyph (InDesign-style inline objects, e.g. mana symbols in card rules text): sized to a multiple of the font size, centred on the cap height, opening up tall lines, following Redefine Symbol; a character of its run's size for Character Alignment and Top-to-Top leading, placed by the bidi reordering in right-to-left text (a neutral U+FFFC); drawn on the canvas, kept as live text plus a `<use>` in SVG and as vector art in PDF; Backspace removes it whole. Hebrew and Arabic are laid out right to left with the Unicode bidirectional algorithm (embedded Latin and numbers keep their direction, lines put in visual order after wrapping) in point, area and path type, with caret, selection and arrow keys in visual order; each paragraph's direction comes from its first strong character unless Paragraph Direction sets it (Paragraph panel with Show Indic Options, `text.setFormat {direction}`), and new type aligns to the start of its direction. SVG export outlines right-to-left text. Arabic typefaces: builds made with a craft-fonts checkout that holds its Arabic families (Noto Sans Arabic, the Arabic fallback, plus Cairo, Tajawal, Almarai, IBM Plex Sans Arabic, Noto Kufi Arabic, Amiri, Alexandria, Fustat, Reem Kufi, Aref Ruqaa and Gulzar once craft-fonts adds them, storytold/craft-fonts#11; releases get them when their craft-fonts pin moves) list them in the font menus on desktop; the web build fetches them from beside the wasm (Noto Sans Arabic before start, so Arabic never shows as boxes, the rest in the background). Font Size and Leading are combo boxes in the Character and Properties panels (Font Size in the Control bar too, beside the Character link, font family and style): type, step with ↑/↓ or the spinner, scrub the label, or pick a preset (6–72 pt, shown in the type unit; Leading also Auto), each pick one undo step; Kerning and Tracking list -100…200; a size, leading, kerning or tracking the selected text doesn't share shows blank (#458). Type › Bold and Italic (beyond Illustrator, as page layout apps have them; Cmd+Shift+B / Cmd+Shift+I while the Type tool edits text) switch the selected type to its family's own Bold or Italic face and back, keeping its width (a Narrow face stays Narrow); a family without that face says so (#724). The commands that make or restyle type (and the MCP `add_text` tool) say in their result when area type does not fit its frame, and `add_text` takes Auto Size and Shrink Text to Fit (#1500, fixes #1471). A tab stop in the Tabs panel drags from where the press landed, a stop just added included (#1487, fixes #1458). Area type in a non-rectangular shape moves a word too wide for the top lines down to the first line that holds it instead of breaking it (#1617, fixes #1615). Stylistic sets (ss01–ss20), stylistic and titling alternates, proportional and lining figures, and superscript and subscript glyphs can be turned on as OpenType features of a character style (`text.setStyle {features}`), and the OpenType panel keeps them (#1611, fixes #1607). Escape while typing ends the edit, keeps the type selected and switches to the Selection tool (#1802, #1686, #1656). Select › Same matches type on its characters' fill and stroke (#1746, #1737). `text.create`, `text.createInPath` and the MCP `add_text` tool take `justify`, so point type can be centred on or end at its point (#1752, #1748).
 - **Type:** Character size, leading, baseline shift and horizontal-scale controls account for object/group transforms (#1034): exact document-point sizes, mixed-value display and keyboard increments, range edits, resettable horizontal stretch, undo/redo and native save/reopen (`tests_typescale`, Character panel tests). Point size is the transformed em-height axis, independent of glyph ink bounds; affine rotation, reflection and shear are retained. Group scaling still scales text; preserving font sizes is a separate enhancement. Behaviour reference: [Transform text](https://helpx.adobe.com/illustrator/desktop/design-with-text/edit-format-text/transform-text.html) (public documentation). Text Wrap, Type on a Path effects (Rainbow/Skew/3D Ribbon/Stair Step/Gravity) and Options (Flip, Align to Path, Spacing; OK keeps the type where it is), type on a path's start, centre and end brackets (Selection and Direct Selection drag them to set where the type runs, slide it along its path and, across the path, flip it: #429), Character and Paragraph Styles (override-preserving redefine), paragraph attributes per paragraph (alignment, indents, spacing, hyphenation, hanging punctuation, tab stops, paragraph style, direction, mojikumi and leading model; the Paragraph, Tabs and Paragraph Styles panels act on the paragraphs the Type tool's selection or caret touches, Return continues the paragraph's style, threads and SVG keep them), Area Type Options (rows/columns/inset/first baseline, vertical Align Top/Center/Bottom/Justify per row/column, reflowing non-rectangular frames and text wrap), threaded text across any closed shapes, Fit Headline, the Every-line Composer for justified and ragged text (paragraph-wide breaks for an even rag, Single-line per object from the Paragraph panel menu or `text.setFormat {composer}`). Area type resizes like Illustrator's type areas: a bounding-box handle drag (Selection tool) or Area Type Options Width/Height size the frame and the text reflows at its size (threads too); Direct Selection drags a frame corner or edge (`text.reshapeArea`). Point type still scales. Auto Size: the frame height follows the text after every edit, in the same undo step (rectangular frames of horizontal type in one row; columns get the least height that holds them; a height set by hand or threading turns it off), and the "Auto Size New Area Type" preference gives it to new area type. Shrink Text to Fit (beyond Illustrator): overflowing area type scales its sizes, leading and baseline shifts down by the largest factor (in 0.1 pt steps of the first run, down to a minimum percentage) that fits, at layout time so every export sees it. `text.areaOptions` and `document.inspect` report overflow and the shrink factor. The Selection tool shows the type widget beside selected type's bounding box (hollow on point type, filled on area type); double-clicking it converts between them (Type › Convert To Area Type / Convert To Point Type), keeping the text and its styles in place. A double-click on area type's bottom middle handle turns on Auto Size (#1940). Variable fonts list every named instance as a style of their family (Figtree Light to Black and their italics, Bahnschrift, Segoe UI Variable), and the instance chosen is shaped, drawn, outlined and measured at its axis settings; PDF and SVG embed it as that instance. The Character panel's Variable Font sliders set each axis (see Fonts). Beyond Illustrator: inline graphics (`text.insertInline`, Type ▸ Insert Inline Symbol) set a document symbol in a run of type as one character that flows, wraps and justifies like a glyph (InDesign-style inline objects, e.g. mana symbols in card rules text): sized to a multiple of the font size, centred on the cap height, opening up tall lines, following Redefine Symbol; a character of its run's size for Character Alignment and Top-to-Top leading, placed by the bidi reordering in right-to-left text (a neutral U+FFFC); drawn on the canvas, kept as live text plus a `<use>` in SVG and as vector art in PDF; Backspace removes it whole. Hebrew and Arabic are laid out right to left with the Unicode bidirectional algorithm (embedded Latin and numbers keep their direction, lines put in visual order after wrapping) in point, area and path type, with caret, selection and arrow keys in visual order; each paragraph's direction comes from its first strong character unless Paragraph Direction sets it (Paragraph panel with Show Indic Options, `text.setFormat {direction}`), and new type aligns to the start of its direction. SVG export outlines right-to-left text. Arabic typefaces: builds made with a craft-fonts checkout that holds its Arabic families (Noto Sans Arabic, the Arabic fallback, plus Cairo, Tajawal, Almarai, IBM Plex Sans Arabic, Noto Kufi Arabic, Amiri, Alexandria, Fustat, Reem Kufi, Aref Ruqaa and Gulzar once craft-fonts adds them, storytold/craft-fonts#11; releases get them when their craft-fonts pin moves) list them in the font menus on desktop; the web build fetches them from beside the wasm (Noto Sans Arabic before start, so Arabic never shows as boxes, the rest in the background). Font Size and Leading are combo boxes in the Character and Properties panels (Font Size in the Control bar too, beside the Character link, font family and style): type, step with ↑/↓ or the spinner, scrub the label, or pick a preset (6–72 pt, shown in the type unit; Leading also Auto), each pick one undo step; Kerning and Tracking list -100…200; a size, leading, kerning or tracking the selected text doesn't share shows blank (#458). Type › Bold and Italic (beyond Illustrator, as page layout apps have them; Cmd+Shift+B / Cmd+Shift+I while the Type tool edits text) switch the selected type to its family's own Bold or Italic face and back, keeping its width (a Narrow face stays Narrow); a family without that face says so (#724). The commands that make or restyle type (and the MCP `add_text` tool) say in their result when area type does not fit its frame, and `add_text` takes Auto Size and Shrink Text to Fit (#1500, fixes #1471). A tab stop in the Tabs panel drags from where the press landed, a stop just added included (#1487, fixes #1458). Area type in a non-rectangular shape moves a word too wide for the top lines down to the first line that holds it instead of breaking it (#1617, fixes #1615). Stylistic sets (ss01–ss20), stylistic and titling alternates, proportional and lining figures, and superscript and subscript glyphs can be turned on as OpenType features of a character style (`text.setStyle {features}`), and the OpenType panel keeps them (#1611, fixes #1607). Escape while typing ends the edit, keeps the type selected and switches to the Selection tool (#1802, #1686, #1656). Select › Same matches type on its characters' fill and stroke (#1746, #1737). `text.create`, `text.createInPath` and the MCP `add_text` tool take `justify`, so point type can be centred on or end at its point (#1752, #1748).
 - **Devanagari shaping:** with an OpenType Devanagari font, Ka, virama and Ssa (क्ष) form one conjunct glyph, Ra and virama before a consonant (र्क) become a reph drawn after it, the i matra (कि) is drawn before its consonant, and Ka with a nukta is drawn like the precomposed क़ (U+0958), as [Microsoft's Devanagari shaping specification](https://learn.microsoft.com/en-us/typography/script-development/devanagari) describes. Each syllable is one cluster of its source bytes, and the arrow keys stop at its ends. A click inside a syllable drawn with several glyphs puts the caret at the syllable's nearer end, in point, area and path type. Tests: `crates/text/src/tests_devanagari.rs`; they print SKIPPED when no such font is installed.
diff --git a/docs/ui-parity.md b/docs/ui-parity.md
index a3c193da6..8a473c30a 100644
--- a/docs/ui-parity.md
+++ b/docs/ui-parity.md
@@ -65,7 +65,7 @@ tools, never checked side by side) isn't captured row by row.
 | Join tool scrubbing, Average, Join | done | Join merges the direct-selected anchors lying on one another along a path, as after Average, into one (#1533) |
 | Average and Join in one step, with a corner or smooth choice for the joined anchor | partial | `path.join` accepts `to: corner|smooth` on the merged anchor; Average and Join are still separate commands; [gap 1](gaps.md) |
 | Smooth tool smooths only the stretch of path under the drag | done | #1512 |
-| Simplify (slider, auto, corner angle threshold) | partial | Tolerance, default-on Preview and original/new point counts (#1272); Corner Point Angle Threshold, Convert to Straight Lines and Show Original Path; slider, auto-simplify and Retain my latest settings remain missing |
+| Simplify (slider, auto, corner angle threshold) | partial | Tolerance, default-on Preview and original/new point counts (#1272); Corner Point Angle Threshold, Convert to Straight Lines and Show Original Path; the slider under the selection with Auto-Simplify and More Options, and the dialog's option to open it directly with its last settings; the slider opens at 1 pt rather than at the Auto-Simplify level, and simplifying only a Direct Selection part of a path remains missing |
 
 ## Direct Selection, anchors and handles