diff --git a/crates/ui-egui/src/canvas.rs b/crates/ui-egui/src/canvas.rs
index 434f73181..3066d1b9e 100644
--- a/crates/ui-egui/src/canvas.rs
+++ b/crates/ui-egui/src/canvas.rs
@@ -4084,7 +4084,7 @@ pub fn document_area(app: &mut PdfCraftApp, index: usize, ui: &mut egui::Ui) {
                     ui.separator();
                 }
             }
-            canvas_action = comments::context_menu(ui, view, info, prefs, allowed).or(copy_image);
+            canvas_action = comments::context_menu(ui, view, info, prefs, allowed, can_modify).or(copy_image);
         });
         (wanted, visible_now)
     });
diff --git a/crates/ui-egui/src/comments.rs b/crates/ui-egui/src/comments.rs
index c520466bf..05ccd5f77 100644
--- a/crates/ui-egui/src/comments.rs
+++ b/crates/ui-egui/src/comments.rs
@@ -1913,7 +1913,15 @@ pub(crate) fn attachment_items(ui: &mut egui::Ui, view: &mut DocView, info: &Doc
 }
 
 /// Items of the canvas context menu for the selected comment (or the page).
-pub(crate) fn context_menu(ui: &mut egui::Ui, view: &mut DocView, info: &DocInfo, prefs: &CommentPrefs, allowed: bool) -> Option<CanvasAction> {
+/// `can_modify`: the document's pages may change (Flatten comments draws into them).
+pub(crate) fn context_menu(
+    ui: &mut egui::Ui,
+    view: &mut DocView,
+    info: &DocInfo,
+    prefs: &CommentPrefs,
+    allowed: bool,
+    can_modify: bool,
+) -> Option<CanvasAction> {
     let mut action = None;
     let selected = view.comments.selected.and_then(|(p, i)| info.annotations.iter().find(|a| a.page == p && a.index == i && a.in_reply_to.is_none()));
     match selected {
@@ -1998,6 +2006,16 @@ pub(crate) fn context_menu(ui: &mut egui::Ui, view: &mut DocView, info: &DocInfo
             }
         }
     }
+    // Every comment of the document into its pages, as Comment ▸ Flatten comments does: signed
+    // or reviewed pages whose comments should no longer move.
+    if !info.annotations.is_empty() {
+        ui.separator();
+        if ui.add_enabled(can_modify, egui::Button::new(tl!("Flatten comments"))).clicked() {
+            view.comments.selected = None;
+            action = Some(CanvasAction::Edit(Box::new(Edit::Flatten { comments: true, fields: false })));
+            ui.close();
+        }
+    }
     action
 }
 
diff --git a/crates/ui-egui/src/comments_panel.rs b/crates/ui-egui/src/comments_panel.rs
index 0f1a387e0..6c13d78d3 100644
--- a/crates/ui-egui/src/comments_panel.rs
+++ b/crates/ui-egui/src/comments_panel.rs
@@ -588,6 +588,12 @@ pub(crate) fn header_controls(ui: &mut egui::Ui, info: &DocInfo, view: &mut DocV
                 ui.close();
             }
         }
+        // Into the pages, for good once saved: apart from the list's other commands.
+        ui.separator();
+        if ui.button(tl!("Flatten comments")).clicked() {
+            command = Some("comment.flatten");
+            ui.close();
+        }
     });
     let filter = icons::button(ui, "filter", 26.0, active, tl!("Filter comments"));
     egui::Popup::menu(&filter).close_behavior(egui::PopupCloseBehavior::CloseOnClickOutside).show(|ui| {
diff --git a/crates/ui-egui/tests/it/comments.rs b/crates/ui-egui/tests/it/comments.rs
index f6c843458..34a38b8cb 100644
--- a/crates/ui-egui/tests/it/comments.rs
+++ b/crates/ui-egui/tests/it/comments.rs
@@ -1391,6 +1391,47 @@ fn page_groups_collapse_and_expand() {
     assert!(shown(&h, "First page note") && shown(&h, "Second page note"), "every page is open again");
 }
 
+/// Flatten comments is in the page's right-click menu and in the Comments panel's "…" menu: the
+/// comments go into the page, one undo step brings them back.
+#[test]
+fn flatten_comments_from_the_page_menu_and_the_panel_menu() {
+    let mut h = harness(|app| {
+        app.set_option("panel", "comments").unwrap();
+        app.set_option("quick", "select").unwrap();
+    });
+    let shape = pdfcraft_engine::Shape::Rectangle { rect: [20.0, 20.0, 80.0, 60.0] };
+    h.state_mut().apply_edit(pdfcraft_engine::Edit::AddAnnotation(pdfcraft_engine::NewAnnotation {
+        page: 0,
+        style: pdfcraft_engine::Style::default_for(&shape),
+        shape,
+        contents: "Reviewed".into(),
+        author: "Tester".into(),
+    }));
+    h.state_mut().views[0].comments.selected = None;
+    settle(&mut h);
+    assert_eq!(comments(&h).len(), 1);
+
+    // Right-click on the page, away from the comment.
+    let p = at(&h, 200.0, 150.0);
+    h.hover_at(p);
+    h.run_steps(1);
+    h.event(egui::Event::PointerButton { pos: p, button: egui::PointerButton::Secondary, pressed: true, modifiers: Default::default() });
+    h.event(egui::Event::PointerButton { pos: p, button: egui::PointerButton::Secondary, pressed: false, modifiers: Default::default() });
+    h.run_steps(3);
+    h.get_by_label("Flatten comments").click();
+    h.run_steps(4);
+    assert!(comments(&h).is_empty(), "the comment went into the page");
+    h.state_mut().undo();
+    h.run_steps(3);
+    assert_eq!(comments(&h).len(), 1, "one undo step brings it back");
+
+    h.get_by_label("More options").click();
+    h.run_steps(2);
+    h.get_by_label("Flatten comments").click();
+    h.run_steps(4);
+    assert!(comments(&h).is_empty(), "the panel's menu flattens too");
+}
+
 #[test]
 fn comments_take_checkmarks_lock_hide_and_summarize() {
     let mut h = harness(|app| {
diff --git a/parity/acrobat-features.toml b/parity/acrobat-features.toml
index 800105fb3..af69e7ace 100644
--- a/parity/acrobat-features.toml
+++ b/parity/acrobat-features.toml
@@ -4256,8 +4256,8 @@ milestone = "M5"
 status = "shipped"
 commands = ["comment.flatten"]
 tools = ["doc_flatten"]
-evidence = ["crates/edit/src/tests.rs::flattening_draws_appearances_into_the_page_and_removes_the_comments", "crates/edit/src/tests.rs::flattening_keeps_an_undrawn_reply_to_a_flattened_comment", "crates/engine/src/tests.rs::flattening_keeps_the_look_and_drops_the_objects", "crates/automation/tests/it/automation.rs::flattening_through_tools", "crates/edit/src/tests.rs::flattening_comments_keeps_annotations_that_are_not_comments"]
-notes = "appearances become page content; pop-ups and replies removed; a comment or reply whose appearance cannot be drawn (a cloudy border, an unsupported subtype) stays as it is instead of being deleted; annotations that are not comments (links, 3D, Screen, Movie, RichMedia, PrinterMark, TrapNet, Watermark) are left in place (#3087)"
+evidence = ["crates/edit/src/tests.rs::flattening_draws_appearances_into_the_page_and_removes_the_comments", "crates/edit/src/tests.rs::flattening_keeps_an_undrawn_reply_to_a_flattened_comment", "crates/engine/src/tests.rs::flattening_keeps_the_look_and_drops_the_objects", "crates/automation/tests/it/automation.rs::flattening_through_tools", "crates/edit/src/tests.rs::flattening_comments_keeps_annotations_that_are_not_comments", "crates/ui-egui/tests/it/comments.rs::flatten_comments_from_the_page_menu_and_the_panel_menu"]
+notes = "also in the page's right-click menu and the Comments panel's More options menu; appearances become page content; pop-ups and replies removed; a comment or reply whose appearance cannot be drawn (a cloudy border, an unsupported subtype) stays as it is instead of being deleted; annotations that are not comments (links, 3D, Screen, Movie, RichMedia, PrinterMark, TrapNet, Watermark) are left in place (#3087)"
 
 [[feature]]
 id = "comment.migrate"