diff --git a/crates/engine/src/cmd/edit.rs b/crates/engine/src/cmd/edit.rs
index 23cc3e544..82c15aac2 100644
--- a/crates/engine/src/cmd/edit.rs
+++ b/crates/engine/src/cmd/edit.rs
@@ -616,6 +616,8 @@ fn copy_impl(s: &mut Session, p: &Json, cut: bool) -> Result<Json> {
     if ranges.len() > 1 && cut {
         return Err(multiple());
     }
+    // The selection as made (untrimmed), for Insert Copied Cells.
+    let selected = ranges.first().copied().unwrap_or_default();
     let d = s.doc()?;
     let Some(sh) = d.wb.sheet(sheet) else { return Err(EngineError::NoDocument) };
     let trim = |range: RangeRef| {
@@ -637,7 +639,7 @@ fn copy_impl(s: &mut Session, p: &Json, cut: bool) -> Result<Json> {
     // The HTML rendering is for the host clipboard (UI); it can reach 4 MB, so agents and
     // scripts get it only when they ask for it.
     let html = if p.get("html").and_then(Json::as_bool) == Some(true) { crate::io::range_html(&wb, sheet, range, &text) } else { None };
-    let clip = Clipboard { wb, sheet, range, cut, doc_uid: d.uid, text: text.clone(), areas };
+    let clip = Clipboard { wb, sheet, range, cut, doc_uid: d.uid, text: text.clone(), areas, selected };
     s.clipboard = Some(clip);
     let mut result = json!({"range": range.a1(), "text": text});
     if let Some(html) = html {
diff --git a/crates/engine/src/cmd/sheet.rs b/crates/engine/src/cmd/sheet.rs
index 175cb81ab..03cb5c285 100644
--- a/crates/engine/src/cmd/sheet.rs
+++ b/crates/engine/src/cmd/sheet.rs
@@ -36,6 +36,15 @@ pub fn specs() -> Vec<CommandSpec> {
             Axis::Cols
         )),
         cmd!("home.insertCells", "Insert Cells…", ["Home", "Cells", "Insert"], None, "{range?, shift: right|down|row|column}", has_doc, insert_cells),
+        cmd!(
+            "home.insertCopiedCells",
+            "Insert Copied Cells",
+            ["Home", "Cells", "Insert"],
+            None,
+            "{at?: \"B3\", shift?: down|right}: inserts the copied cells at `at` (the active cell) and pastes them there. Whole copied rows or columns insert whole rows or columns; other blocks shift the cells at `at` down (default) or right. A cut of whole rows or columns moves them (Insert Cut Cells)",
+            has_clipboard,
+            insert_copied_cells
+        ),
         cmd!("home.deleteCells", "Delete Cells…", ["Home", "Cells", "Delete"], None, "{range?, shift: left|up|row|column}", has_doc, delete_cells),
         cmd!("home.insertSheet", "Insert Sheet", ["Home", "Cells", "Insert"], Some("Shift+F11"), "{name?, before?: index}", has_doc, insert_sheet),
         cmd!("home.deleteSheet", "Delete Sheet", ["Home", "Cells", "Delete"], None, "{sheet?}", has_doc, delete_sheet),
@@ -385,6 +394,128 @@ fn delete_cells(s: &mut Session, p: &Json) -> Result<Json> {
     Ok(out)
 }
 
+/// Insert Copied Cells / Insert Cut Cells: makes room at the destination, then pastes (or, for a
+/// cut, moves) the clipboard there, as one undo step.
+fn insert_copied_cells(s: &mut Session, p: &Json) -> Result<Json> {
+    let Some(clip) = s.clipboard.clone() else { return Err(EngineError::Other("Nothing to paste.".into())) };
+    let sheet = target_sheet(s, p)?;
+    let d = s.doc()?;
+    let at = match str_param(p, "at") {
+        Some(t) => cell_param(p, "at").ok_or_else(|| bad("home.insertCopiedCells", format!("not a cell: {t}")))?,
+        None => d.selection.current().start,
+    };
+    let shift = str_param(p, "shift").unwrap_or("down");
+    if shift != "down" && shift != "right" {
+        return Err(bad("home.insertCopiedCells", format!("unknown `shift`: {shift} (down or right)")));
+    }
+    let sel = clip.selected;
+    let rows = sel.is_full_rows();
+    let cols = sel.is_full_cols();
+    if rows && cols {
+        return Err(EngineError::Other("The copy area is the whole sheet; there is no room to insert it.".into()));
+    }
+    let same_doc = d.uid == clip.doc_uid;
+    let cut = clip.cut && same_doc;
+    if cut && !rows && !cols {
+        return Err(EngineError::Other("Insert Cut Cells works on whole rows or columns; cut whole rows or columns, or use Paste.".into()));
+    }
+    // A moved block can't be inserted inside itself.
+    if cut && clip.sheet == sheet {
+        let inside = if rows { at.row > sel.start.row && at.row <= sel.end.row } else { at.col > sel.start.col && at.col <= sel.end.col };
+        if inside {
+            return Err(EngineError::Other("The cut rows or columns can't be inserted inside themselves.".into()));
+        }
+    }
+    let revision = d.revision;
+    let before = (d.wb.clone(), d.selection.clone());
+    let result = insert_copied_steps(s, &clip, sheet, at, shift, cut);
+    let d = s.doc_mut()?;
+    // The nested steps collapse into this command's single undo step.
+    for _ in 0..d.revision.saturating_sub(revision) {
+        d.undo.pop();
+    }
+    match result {
+        Ok((final_range, out)) => {
+            d.selection = crate::Selection { active: final_range.start, anchor: final_range.start, ranges: vec![final_range] };
+            // Like inserting cells, this ends copy mode (the copied block may have moved).
+            cancel_copy_mode(s);
+            Ok(out)
+        }
+        Err(e) => {
+            d.wb = before.0;
+            d.selection = before.1;
+            d.calc.rebuild(&d.wb);
+            s.clipboard = Some(clip);
+            Err(e)
+        }
+    }
+}
+
+fn insert_copied_steps(s: &mut Session, clip: &crate::Clipboard, sheet: usize, at: CellRef, shift: &str, cut: bool) -> Result<(RangeRef, Json)> {
+    let sel = clip.selected;
+    let rows = sel.is_full_rows();
+    let cols = sel.is_full_cols();
+    // Where the copied block's top-left lands, relative to the (untrimmed) copied lines.
+    let (inserted, paste_at) = if rows {
+        let h = sel.height();
+        let start = at.row;
+        let r = format!("{}:{}", start as u64 + 1, start as u64 + h as u64);
+        s.execute("home.insertRows", json!({"rows": r, "sheet": sheet}))?;
+        let dr = clip.range.start.row.saturating_sub(sel.start.row);
+        (RangeRef::rows(start, start.saturating_add(h - 1).min(MAX_ROWS - 1)), CellRef::new(start.saturating_add(dr), clip.range.start.col))
+    } else if cols {
+        let w = sel.width();
+        let start = at.col;
+        let end = start.saturating_add(w - 1).min(MAX_COLS - 1);
+        s.execute("home.insertColumns", json!({"cols": RangeRef::cols(start, end).a1(), "sheet": sheet}))?;
+        let dc = clip.range.start.col.saturating_sub(sel.start.col);
+        (RangeRef::cols(start, end), CellRef::new(clip.range.start.row, start.saturating_add(dc)))
+    } else {
+        let end = at
+            .offset(clip.range.height() as i64 - 1, clip.range.width() as i64 - 1)
+            .ok_or_else(|| EngineError::Other("The copied cells don't fit on the sheet at this position.".into()))?;
+        let block = RangeRef::new(at, end);
+        s.execute("home.insertCells", json!({"range": block.a1(), "shift": shift, "sheet": sheet}))?;
+        (block, at)
+    };
+    // Inserting ended copy mode; bring the clipboard back for the paste. A cut reads the live
+    // workbook, so it follows the source if the insert pushed it along.
+    let mut clip = clip.clone();
+    if cut {
+        let pushed = clip.sheet == sheet && if rows { sel.start.row >= at.row } else { sel.start.col >= at.col };
+        if pushed {
+            let (dr, dc) = if rows { (inserted.height() as i64, 0) } else { (0, inserted.width() as i64) };
+            clip.range = RangeRef::new(clip.range.start.offset_clamped(dr, dc), clip.range.end.offset_clamped(dr, dc));
+            clip.selected = RangeRef::new(sel.start.offset_clamped(dr, dc), sel.end.offset_clamped(dr, dc));
+        }
+        clip.wb = s.doc()?.wb.clone();
+    }
+    let source_lines = clip.selected;
+    s.clipboard = Some(clip.clone());
+    let out = s.execute("edit.pasteSpecial", json!({"what": "all", "at": paste_at.a1(), "sheet": sheet}))?;
+    if !cut {
+        return Ok((inserted, out));
+    }
+    // Close the gap the moved lines left behind.
+    let (removed, before_dest) = if rows {
+        s.execute(
+            "home.deleteRows",
+            json!({"rows": format!("{}:{}", source_lines.start.row as u64 + 1, source_lines.end.row as u64 + 1), "sheet": clip.sheet}),
+        )?;
+        (source_lines.height(), clip.sheet == sheet && source_lines.start.row < inserted.start.row)
+    } else {
+        s.execute("home.deleteColumns", json!({"cols": RangeRef::cols(source_lines.start.col, source_lines.end.col).a1(), "sheet": clip.sheet}))?;
+        (source_lines.width(), clip.sheet == sheet && source_lines.start.col < inserted.start.col)
+    };
+    let moved = if before_dest {
+        let (dr, dc) = if rows { (-(removed as i64), 0) } else { (0, -(removed as i64)) };
+        RangeRef::new(inserted.start.offset_clamped(dr, dc), inserted.end.offset_clamped(dr, dc))
+    } else {
+        inserted
+    };
+    Ok((moved, out))
+}
+
 fn insert_sheet(s: &mut Session, p: &Json) -> Result<Json> {
     if s.doc()?.wb.protected_structure {
         return Err(EngineError::Other("The workbook is protected and cannot be changed.".into()));
diff --git a/crates/engine/src/lib.rs b/crates/engine/src/lib.rs
index ce39c0816..6885dc4d2 100644
--- a/crates/engine/src/lib.rs
+++ b/crates/engine/src/lib.rs
@@ -67,6 +67,9 @@ pub struct Clipboard {
     pub wb: Arc<Workbook>,
     pub sheet: usize,
     pub range: RangeRef,
+    /// The range as copied, before whole rows/columns were trimmed to the used range
+    /// (Insert Copied Cells inserts whole lines for a row or column copy).
+    pub selected: RangeRef,
     pub cut: bool,
     /// Document uid of the source (a cut only moves within the same workbook).
     pub doc_uid: u64,
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index 78ade6315..cf24ab3e7 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -521,6 +521,71 @@ fn insert_delete_rows_adjust() {
     assert_eq!(v(&s, "A1"), Value::Number(10.0));
 }
 
+#[test]
+fn insert_copied_cells_inserts_rows_columns_and_blocks() {
+    // Issue #21: Insert Copied Cells.
+    let mut s = s();
+    s.execute("range.setValues", json!({"range": "A1", "values": [[1], [2], [3], [4], [5]]})).unwrap();
+    s.execute("cell.set", json!({"cell": "B2", "input": "=A2*10"})).unwrap();
+    s.execute("edit.copy", json!({"range": "2:2"})).unwrap();
+    s.execute("selection.set", json!({"range": "C4"})).unwrap();
+    s.execute("home.insertCopiedCells", json!({})).unwrap();
+    assert_eq!(v(&s, "A4"), Value::Number(2.0));
+    assert_eq!(v(&s, "B4"), Value::Number(20.0), "the formula follows its new row");
+    assert_eq!(v(&s, "A5"), Value::Number(4.0));
+    assert_eq!(v(&s, "A6"), Value::Number(5.0));
+    assert_eq!(s.doc().unwrap().selection.current(), gridcraft_core::RangeRef::rows(3, 3));
+    // One undo step puts everything back.
+    s.execute("edit.undo", json!({})).unwrap();
+    assert_eq!(v(&s, "A4"), Value::Number(4.0));
+    assert_eq!(v(&s, "A6"), Value::Empty);
+    // Whole columns.
+    s.execute("edit.copy", json!({"range": "A:A"})).unwrap();
+    s.execute("home.insertCopiedCells", json!({"at": "A1"})).unwrap();
+    assert_eq!(v(&s, "A3"), Value::Number(3.0));
+    assert_eq!(v(&s, "B3"), Value::Number(3.0));
+    assert_eq!(v(&s, "C2"), Value::Number(20.0), "the old column B moved right");
+    // A block shifts cells right.
+    s.execute("cell.set", json!({"cell": "F1", "input": "x"})).unwrap();
+    s.execute("cell.set", json!({"cell": "G1", "input": "y"})).unwrap();
+    s.execute("edit.copy", json!({"range": "F1"})).unwrap();
+    s.execute("home.insertCopiedCells", json!({"at": "G1", "shift": "right"})).unwrap();
+    assert_eq!(v(&s, "G1"), Value::from("x"));
+    assert_eq!(v(&s, "H1"), Value::from("y"));
+    assert!(s.clipboard.is_none(), "inserting ends copy mode");
+    s.execute("edit.copy", json!({"range": "F1"})).unwrap();
+    assert!(s.execute("home.insertCopiedCells", json!({"shift": "up"})).is_err());
+}
+
+#[test]
+fn insert_cut_cells_moves_whole_rows() {
+    let mut s = s();
+    s.execute("range.setValues", json!({"range": "A1", "values": [[1], [2], [3], [4], [5]]})).unwrap();
+    s.execute("cell.set", json!({"cell": "C1", "input": "=A5"})).unwrap();
+    // Up: row 5 goes above row 2.
+    s.execute("edit.cut", json!({"range": "5:5"})).unwrap();
+    s.execute("home.insertCopiedCells", json!({"at": "A2"})).unwrap();
+    let col: Vec<Value> = (1..=6).map(|r| v(&s, &format!("A{r}"))).collect();
+    assert_eq!(col, [1.0, 5.0, 2.0, 3.0, 4.0].map(Value::Number).into_iter().chain([Value::Empty]).collect::<Vec<_>>());
+    assert_eq!(v(&s, "C1"), Value::Number(5.0), "references follow the moved cells");
+    assert!(s.clipboard.is_none());
+    // Down: row 1 goes above row 4.
+    s.execute("edit.cut", json!({"range": "1:1"})).unwrap();
+    s.execute("home.insertCopiedCells", json!({"at": "A4"})).unwrap();
+    let col: Vec<Value> = (1..=5).map(|r| v(&s, &format!("A{r}"))).collect();
+    assert_eq!(col, [5.0, 2.0, 1.0, 3.0, 4.0].map(Value::Number).to_vec());
+    assert_eq!(s.doc().unwrap().selection.current(), gridcraft_core::RangeRef::rows(2, 2));
+    s.execute("edit.undo", json!({})).unwrap();
+    assert_eq!(v(&s, "A1"), Value::Number(1.0));
+    // Inside itself, and a cut block, are refused without changing anything.
+    s.execute("edit.cut", json!({"range": "2:4"})).unwrap();
+    assert!(s.execute("home.insertCopiedCells", json!({"at": "A3"})).is_err());
+    s.execute("edit.cut", json!({"range": "A1:A2"})).unwrap();
+    assert!(s.execute("home.insertCopiedCells", json!({"at": "B5"})).is_err());
+    assert_eq!(v(&s, "A1"), Value::Number(1.0));
+    assert_eq!(v(&s, "B5"), Value::Empty);
+}
+
 #[test]
 fn inserting_or_deleting_cells_cancels_copy_mode() {
     let mut s = s();
diff --git a/crates/ui-egui/src/dialogs.rs b/crates/ui-egui/src/dialogs.rs
index a2db48ead..52f2df509 100644
--- a/crates/ui-egui/src/dialogs.rs
+++ b/crates/ui-egui/src/dialogs.rs
@@ -100,6 +100,13 @@ impl Dialog {
                 }],
                 json!({"shift": "down"}),
             ),
+            "insertPaste" => Dialog::form(
+                "insertPaste",
+                "Insert Paste",
+                "home.insertCopiedCells",
+                vec![Choice { key: "shift", label: "Insert", options: vec![("right", "Shift cells right"), ("down", "Shift cells down")] }],
+                json!({"shift": "down"}),
+            ),
             "deleteCells" => Dialog::form(
                 "deleteCells",
                 "Delete",
diff --git a/crates/ui-egui/src/grid.rs b/crates/ui-egui/src/grid.rs
index c49e7bd4c..29085bdd4 100644
--- a/crates/ui-egui/src/grid.rs
+++ b/crates/ui-egui/src/grid.rs
@@ -2172,7 +2172,8 @@ fn context_menu(app: &mut SheetApp, ui: &mut egui::Ui) {
     let resp = egui::Area::new(egui::Id::new("cell_context")).fixed_pos(at).order(egui::Order::Foreground).show(ui.ctx(), |ui| {
         egui::Frame::popup(ui.style()).show(ui, |ui| {
             ui.set_min_width(200.0);
-            let items: &[(&str, &str)] = &[
+            let insert_copied = insert_copied_item(app);
+            let mut items: Vec<(&str, &str)> = vec![
                 ("Cut", "edit.cut"),
                 ("Copy", "edit.copy"),
                 ("Paste", "edit.paste"),
@@ -2194,15 +2195,20 @@ fn context_menu(app: &mut SheetApp, ui: &mut egui::Ui) {
                 ("Define Name…", "ui:defineName"),
                 ("Link…", "ui:insertLink"),
             ];
+            if let Some(item) = insert_copied {
+                items.insert(6, item);
+            }
+            let lang = crate::i18n::current(ui.ctx());
             for (label, id) in items {
-                if *label == "-" {
+                if label == "-" {
                     ui.separator();
                     continue;
                 }
-                if ui.add(egui::Button::new(*label).frame(false).min_size(vec2(190.0, 20.0))).clicked() {
+                if ui.add(egui::Button::new(lang.tr(label)).frame(false).min_size(vec2(190.0, 20.0))).clicked() {
                     close = true;
-                    match *id {
+                    match id {
                         "ui:pasteSpecial" => app.open_dialog("pasteSpecial", json!({})),
+                        "ui:insertPaste" => app.open_dialog("insertPaste", json!({})),
                         "ui:insertCells" => app.open_dialog("insertCells", json!({})),
                         "ui:deleteCells" => app.open_dialog("deleteCells", json!({})),
                         "ui:formatCells" => app.open_dialog("formatCells", json!({})),
@@ -2414,7 +2420,8 @@ fn header_menu(app: &mut SheetApp, ui: &mut egui::Ui, was_open: bool) {
     let response = egui::Area::new(egui::Id::new("header_menu")).fixed_pos(at).order(egui::Order::Foreground).show(ui.ctx(), |ui| {
         egui::Frame::popup(ui.style()).show(ui, |ui| {
             ui.set_min_width(190.0);
-            let items: Vec<(&str, &str)> = if rows {
+            let insert_copied = insert_copied_item(app);
+            let mut items: Vec<(&str, &str)> = if rows {
                 vec![
                     ("Cut", "edit.cut"),
                     ("Copy", "edit.copy"),
@@ -2448,14 +2455,19 @@ fn header_menu(app: &mut SheetApp, ui: &mut egui::Ui, was_open: bool) {
                     ("Group", "data.group"),
                 ]
             };
+            if let Some(item) = insert_copied {
+                items.insert(5, item);
+            }
+            let lang = crate::i18n::current(ui.ctx());
             for (label, id) in items {
                 if label == "-" {
                     ui.separator();
                     continue;
                 }
-                if ui.add(egui::Button::new(label).frame(false).min_size(vec2(180.0, 20.0))).clicked() {
+                if ui.add(egui::Button::new(lang.tr(label)).frame(false).min_size(vec2(180.0, 20.0))).clicked() {
                     close = true;
                     match id {
+                        "ui:insertPaste" => app.open_dialog("insertPaste", json!({})),
                         "ui:rowHeight" => app.open_dialog("rowHeight", json!({})),
                         "ui:columnWidth" => app.open_dialog("columnWidth", json!({})),
                         "edit.copy" | "edit.cut" => {
@@ -2472,6 +2484,21 @@ fn header_menu(app: &mut SheetApp, ui: &mut egui::Ui, was_open: bool) {
     }
 }
 
+/// The context-menu entry for Insert Copied Cells / Insert Cut Cells, when the clipboard holds a
+/// copy or cut of this app: whole rows or columns insert at once, a block asks which way to shift
+/// (Insert Paste). A cut block can only be pasted, so it gets no entry.
+fn insert_copied_item(app: &SheetApp) -> Option<(&'static str, &'static str)> {
+    let clip = app.session.clipboard.as_ref()?;
+    let lines = clip.selected.is_full_rows() != clip.selected.is_full_cols();
+    let cut = clip.cut && app.session.active().is_some_and(|d| d.uid == clip.doc_uid);
+    match (cut, lines) {
+        (true, true) => Some(("Insert Cut Cells", "home.insertCopiedCells")),
+        (true, false) => None,
+        (false, true) => Some(("Insert Copied Cells", "home.insertCopiedCells")),
+        (false, false) => Some(("Insert Copied Cells…", "ui:insertPaste")),
+    }
+}
+
 fn is_checkbox(sh: &Sheet, app: &SheetApp) -> bool {
     let Some(d) = app.session.active() else { return false };
     d.wb.styles.get(sh.style_id(d.selection.active)).num_fmt.as_str() == "checkbox"
diff --git a/crates/ui-egui/src/i18n.rs b/crates/ui-egui/src/i18n.rs
index f0b1d9116..9ebde7eda 100644
--- a/crates/ui-egui/src/i18n.rs
+++ b/crates/ui-egui/src/i18n.rs
@@ -171,6 +171,10 @@ const JAPANESE: &[(&str, &str)] = &[
     ("Transpose", "行列を入れ替え"),
     ("Paste Link", "リンクの貼り付け"),
     ("Paste Special…", "形式を選択して貼り付け…"),
+    ("Insert Copied Cells", "コピーしたセルの挿入"),
+    ("Insert Copied Cells…", "コピーしたセルの挿入…"),
+    ("Insert Cut Cells", "切り取ったセルの挿入"),
+    ("Insert Paste", "挿入貼り付け"),
     ("Cut (⌘X)", "切り取り (⌘X)"),
     ("Copy (⌘C)", "コピー (⌘C)"),
     ("Format Painter (double-click to keep it on)", "書式のコピー/貼り付け (ダブルクリックで固定)"),
diff --git a/crates/ui-egui/src/i18n/cs.rs b/crates/ui-egui/src/i18n/cs.rs
index 0d01ba921..96b760408 100644
--- a/crates/ui-egui/src/i18n/cs.rs
+++ b/crates/ui-egui/src/i18n/cs.rs
@@ -184,6 +184,10 @@ pub(super) fn translate(text: &str) -> Option<&'static str> {
         "Gridlines" => "Mřížka",
         "Headings" => "Záhlaví",
         "Zoom" => "Lupa",
+        "Insert Copied Cells" => "Vložit zkopírované buňky",
+        "Insert Copied Cells…" => "Vložit zkopírované buňky…",
+        "Insert Cut Cells" => "Vložit vyjmuté buňky",
+        "Insert Paste" => "Vložit a posunout",
         "Previous" => "Předchozí",
         "Next" => "Další",
         "Previous Comment" => "Předchozí komentář",
diff --git a/crates/ui-egui/src/i18n/de.rs b/crates/ui-egui/src/i18n/de.rs
index c5f71196e..1fbf2e3bc 100644
--- a/crates/ui-egui/src/i18n/de.rs
+++ b/crates/ui-egui/src/i18n/de.rs
@@ -184,6 +184,10 @@ pub(super) fn translate(text: &str) -> Option<&'static str> {
         "Gridlines" => "Gitternetzlinien",
         "Headings" => "Überschriften",
         "Zoom" => "Zoom",
+        "Insert Copied Cells" => "Kopierte Zellen einfügen",
+        "Insert Copied Cells…" => "Kopierte Zellen einfügen…",
+        "Insert Cut Cells" => "Ausgeschnittene Zellen einfügen",
+        "Insert Paste" => "Einfügen und verschieben",
         "Previous" => "Zurück",
         "Next" => "Weiter",
         "Previous Comment" => "Vorheriger Kommentar",
diff --git a/crates/ui-egui/src/i18n/es.rs b/crates/ui-egui/src/i18n/es.rs
index 7cf8c9a5a..00fa6b93d 100644
--- a/crates/ui-egui/src/i18n/es.rs
+++ b/crates/ui-egui/src/i18n/es.rs
@@ -185,6 +185,10 @@ pub(super) fn translate(text: &str) -> Option<&'static str> {
         "Gridlines" => "Líneas de cuadrícula",
         "Headings" => "Encabezados",
         "Zoom" => "Zoom",
+        "Insert Copied Cells" => "Insertar celdas copiadas",
+        "Insert Copied Cells…" => "Insertar celdas copiadas…",
+        "Insert Cut Cells" => "Insertar celdas cortadas",
+        "Insert Paste" => "Insertar y pegar",
         "Previous" => "Anterior",
         "Next" => "Siguiente",
         "Previous Comment" => "Comentario anterior",
diff --git a/crates/ui-egui/src/i18n/ko.rs b/crates/ui-egui/src/i18n/ko.rs
index 013fad6f7..334a96c41 100644
--- a/crates/ui-egui/src/i18n/ko.rs
+++ b/crates/ui-egui/src/i18n/ko.rs
@@ -9,6 +9,10 @@ pub(super) fn translate(text: &str) -> Option<&'static str> {
         "Transpose" => "행/열 바꾸기",
         "Paste Link" => "연결하여 붙여넣기",
         "Paste Special…" => "선택하여 붙여넣기…",
+        "Insert Copied Cells" => "복사한 셀 삽입",
+        "Insert Copied Cells…" => "복사한 셀 삽입…",
+        "Insert Cut Cells" => "잘라낸 셀 삽입",
+        "Insert Paste" => "삽입 붙여넣기",
         "Cut (⌘X)" => "잘라내기 (⌘X)",
         "Copy (⌘C)" => "복사 (⌘C)",
         "Format Painter (double-click to keep it on)" => "서식 복사 (두 번 클릭하여 유지)",
diff --git a/crates/ui-egui/src/i18n/pt.rs b/crates/ui-egui/src/i18n/pt.rs
index b5c5c2d3f..a22e95f39 100644
--- a/crates/ui-egui/src/i18n/pt.rs
+++ b/crates/ui-egui/src/i18n/pt.rs
@@ -10,6 +10,10 @@ pub(super) fn translate(text: &str) -> Option<&'static str> {
         "Transpose" => "Transpor",
         "Paste Link" => "Colar Vínculo",
         "Paste Special…" => "Colar Especial…",
+        "Insert Copied Cells" => "Inserir Células Copiadas",
+        "Insert Copied Cells…" => "Inserir Células Copiadas…",
+        "Insert Cut Cells" => "Inserir Células Recortadas",
+        "Insert Paste" => "Inserir Colagem",
         "Cut (⌘X)" => "Recortar (⌘X)",
         "Copy (⌘C)" => "Copiar (⌘C)",
         "Format Painter (double-click to keep it on)" => "Pincel de Formatação (clique duas vezes para mantê-lo ativo)",
diff --git a/crates/ui-egui/src/i18n/ru.rs b/crates/ui-egui/src/i18n/ru.rs
index 5db05715d..2ec76dad7 100644
--- a/crates/ui-egui/src/i18n/ru.rs
+++ b/crates/ui-egui/src/i18n/ru.rs
@@ -9,6 +9,10 @@ pub(super) fn translate(text: &str) -> Option<&'static str> {
         "Transpose" => "Транспонировать",
         "Paste Link" => "Вставить связь",
         "Paste Special…" => "Специальная вставка…",
+        "Insert Copied Cells" => "Вставить скопированные ячейки",
+        "Insert Copied Cells…" => "Вставить скопированные ячейки…",
+        "Insert Cut Cells" => "Вставить вырезанные ячейки",
+        "Insert Paste" => "Вставка со сдвигом",
         "Cut (⌘X)" => "Вырезать (⌘X)",
         "Copy (⌘C)" => "Копировать (⌘C)",
         "Format Painter (double-click to keep it on)" => "Формат по образцу (дважды щёлкните, чтобы закрепить)",
diff --git a/crates/ui-egui/src/i18n/zh.rs b/crates/ui-egui/src/i18n/zh.rs
index 6561c625d..26ba89e52 100644
--- a/crates/ui-egui/src/i18n/zh.rs
+++ b/crates/ui-egui/src/i18n/zh.rs
@@ -9,6 +9,10 @@ pub(super) fn translate(text: &str) -> Option<&'static str> {
         "Transpose" => "转置",
         "Paste Link" => "粘贴链接",
         "Paste Special…" => "选择性粘贴…",
+        "Insert Copied Cells" => "插入复制的单元格",
+        "Insert Copied Cells…" => "插入复制的单元格…",
+        "Insert Cut Cells" => "插入剪切的单元格",
+        "Insert Paste" => "插入粘贴",
         "Cut (⌘X)" => "剪切 (⌘X)",
         "Copy (⌘C)" => "复制 (⌘C)",
         "Format Painter (double-click to keep it on)" => "格式刷（双击可持续使用）",
diff --git a/crates/ui-egui/tests/insert_copied_cells.rs b/crates/ui-egui/tests/insert_copied_cells.rs
new file mode 100644
index 000000000..89621f21b
--- /dev/null
+++ b/crates/ui-egui/tests/insert_copied_cells.rs
@@ -0,0 +1,60 @@
+//! The context menus offer Insert Copied Cells while the clipboard holds a copy (#21).
+
+use egui::{Event, Modifiers, PointerButton, pos2};
+use egui_kittest::kittest::Queryable;
+use gridcraft_engine::Session;
+use gridcraft_engine::core::{CellRef, Value};
+use gridcraft_ui_egui::{SheetApp, grid};
+use serde_json::json;
+
+type Harness = egui_kittest::Harness<'static, SheetApp>;
+
+fn harness() -> Harness {
+    let mut session = Session::new();
+    session.new_workbook();
+    session.execute("range.setValues", json!({"range": "A1", "values": [[1], [2], [3], [4]]})).unwrap();
+    let mut h = egui_kittest::Harness::builder().with_size(egui::vec2(1200.0, 800.0)).build_ui_state(
+        |ui, app: &mut SheetApp| {
+            app.logic(ui.ctx());
+            app.ui(ui);
+        },
+        SheetApp::new(session, Default::default()),
+    );
+    h.run_steps(4);
+    h
+}
+
+fn value(h: &Harness, cell: &str) -> Value {
+    h.state().session.active().unwrap().wb.active().unwrap().value(CellRef::parse(cell).unwrap())
+}
+
+fn right_click_row_header(h: &mut Harness, cell: &str) {
+    let app = h.state();
+    let sh = app.session.active().unwrap().wb.active().unwrap();
+    let geo = grid::Geo::new(sh, app.grid.rect.unwrap(), app.view().scroll);
+    let y = geo.cell_rect(sh, CellRef::parse(cell).unwrap()).center().y;
+    let pos = pos2((geo.rect.left() + geo.cells.left()) / 2.0, y);
+    h.input_mut().events.push(Event::PointerMoved(pos));
+    h.input_mut().events.push(Event::PointerButton { pos, button: PointerButton::Secondary, pressed: true, modifiers: Modifiers::NONE });
+    h.input_mut().events.push(Event::PointerButton { pos, button: PointerButton::Secondary, pressed: false, modifiers: Modifiers::NONE });
+    h.run_steps(2);
+}
+
+#[test]
+fn row_header_menu_inserts_copied_rows() {
+    let mut h = harness();
+    // Nothing copied: no entry.
+    right_click_row_header(&mut h, "A3");
+    assert!(h.state().grid.header_menu.is_some());
+    assert!(h.query_by_label("Insert Copied Cells").is_none());
+    h.state_mut().grid.header_menu = None;
+    h.run_steps(2);
+
+    h.state_mut().run("edit.copy", json!({"range": "1:1"})).unwrap();
+    right_click_row_header(&mut h, "A3");
+    h.get_by_label("Insert Copied Cells").click();
+    h.run_steps(2);
+    assert_eq!(value(&h, "A3"), Value::Number(1.0));
+    assert_eq!(value(&h, "A4"), Value::Number(3.0));
+    assert_eq!(value(&h, "A5"), Value::Number(4.0));
+}
diff --git a/docs/gaps.md b/docs/gaps.md
index fecd06cc4..51fdd3e34 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -77,7 +77,7 @@ No alpha blockers: every core workflow passes the [alpha gate](roadmap.md#alpha-
 - **Estimate:** 20–30 h for beta (25–40 h full).
 
 ### 9. Keyboard-first users: key tips, shortcuts, context menus (U)
-- **Evidence:** #33, #49 (key tips: initial Home-tab support landed in #43 on 10-10, the rest of the ribbon not yet), #110, #21 (Insert Copied Cells), #28 (selection),
+- **Evidence:** #33, #49 (key tips: initial Home-tab support landed in #43 on 10-10, the rest of the ribbon not yet), #110, #28 (selection),
   59 command shortcuts vs Excel's 200+.
 - **Estimate:** 12–20 h. [ui-parity.md](ui-parity.md)
 
diff --git a/docs/ui-parity.md b/docs/ui-parity.md
index a4f3b448f..41e19b8b7 100644
--- a/docs/ui-parity.md
+++ b/docs/ui-parity.md
@@ -42,7 +42,7 @@ Sources: `crates/ui-egui/src` (ribbon, grid, editor, formula bar, dialogs, panes
 | Header resize and double-click AutoFit | done (#42, #88 for header dividers) |
 | Freeze panes, split panes | freeze done; split to verify |
 | Copy as HTML table for other apps | done (#36, 10-10) |
-| Context menu on cells | 16 items (Cut, Copy, Paste, Paste Special, Insert, Delete, Clear Contents, Filter by value, Sort, New Comment, New Note, Format Cells, Pick From Drop-down List, Define Name, Link). Missing: Insert Copied/Cut Cells (#21), paste-option icons, Quick Analysis, Get Data from Table, Show Changes, Smart Lookup |
+| Context menu on cells | 16 items (Cut, Copy, Paste, Paste Special, Insert, Delete, Clear Contents, Filter by value, Sort, New Comment, New Note, Format Cells, Pick From Drop-down List, Define Name, Link). Insert Copied Cells (Insert Cut Cells for whole rows/columns) while the clipboard holds a copy (#21). Missing: Insert Cut Cells for a cell block, paste-option icons, Quick Analysis, Get Data from Table, Show Changes, Smart Lookup |
 | Move and resize charts, pictures and shapes | charts can't be resized (#190) |
 | Context menus on row/column headers, sheet tabs, charts, shapes | headers and tabs done; objects partial |
 | Quick Analysis (Ctrl+Q) | missing |