diff --git a/packages/super-editor/src/editors/v1/components/context-menu/ContextMenu.vue b/packages/super-editor/src/editors/v1/components/context-menu/ContextMenu.vue
index c7b5daef28..7e9dd02504 100644
--- a/packages/super-editor/src/editors/v1/components/context-menu/ContextMenu.vue
+++ b/packages/super-editor/src/editors/v1/components/context-menu/ContextMenu.vue
@@ -9,6 +9,7 @@ import { moveCursorToMouseEvent } from '../cursor-helpers.js';
 import { getEditorSurfaceElement } from '../../core/helpers/editorSurface.js';
 import { getItems } from './menuItems.js';
 import { getEditorContext } from './utils.js';
+import { clampMenuPositionToBounds, resolveMenuBounds } from './menu-position.js';
 import { CONTEXT_MENU_HANDLED_FLAG } from './event-flags.js';
 import { isMacOS } from '../../core/utilities/isMacOS.js';
 
@@ -583,6 +584,13 @@ onMounted(() => {
     searchQuery.value = '';
     selectedId.value = flattenedItems.value[0]?.id || null;
     isOpen.value = true;
+
+    await nextTick();
+    const menuRect = menuRef.value?.getBoundingClientRect();
+    if (menuRect?.width > 0 && menuRect.height > 0) {
+      const bounds = resolveMenuBounds(getEditorSurfaceElement(props.editor) ?? menuRef.value, window);
+      menuPosition.value = clampMenuPositionToBounds(menuPosition.value, menuRect, bounds);
+    }
   };
   props.editor.on('contextMenu:open', contextMenuOpenHandler);
 
diff --git a/packages/super-editor/src/editors/v1/components/context-menu/menu-position.js b/packages/super-editor/src/editors/v1/components/context-menu/menu-position.js
new file mode 100644
index 0000000000..49b16586f8
--- /dev/null
+++ b/packages/super-editor/src/editors/v1/components/context-menu/menu-position.js
@@ -0,0 +1,65 @@
+const findScrollableAncestor = (element, view) => {
+  let current = element;
+  while (current) {
+    const { overflowX, overflowY } = view.getComputedStyle(current);
+    if (/(auto|scroll)/.test(overflowY) || /(auto|scroll)/.test(overflowX)) return current;
+    current = current.parentElement;
+  }
+  return null;
+};
+
+/**
+ * Visible bounds (viewport coordinates) a fixed-position menu should stay within: the viewport
+ * minus any window scrollbar, intersected with `anchorEl`'s nearest scroll container's content box.
+ * Using the container's clientWidth/clientHeight excludes that container's scrollbar, so the menu
+ * never renders under the right/bottom scrollbar.
+ *
+ * @param {Element|null} anchorEl - Element inside the scroll area (e.g. the editor surface).
+ * @param {Window} view - Window used for measurements (injectable for tests).
+ * @returns {{ left: number, top: number, right: number, bottom: number }}
+ */
+export const resolveMenuBounds = (anchorEl, view) => {
+  const docEl = view.document.documentElement;
+  const bounds = { left: 0, top: 0, right: docEl.clientWidth, bottom: docEl.clientHeight };
+
+  const scroller = anchorEl ? findScrollableAncestor(anchorEl, view) : null;
+  if (scroller && scroller.getBoundingClientRect) {
+    const rect = scroller.getBoundingClientRect();
+    bounds.left = Math.max(bounds.left, rect.left);
+    bounds.top = Math.max(bounds.top, rect.top);
+    bounds.right = Math.min(bounds.right, rect.left + scroller.clientWidth);
+    bounds.bottom = Math.min(bounds.bottom, rect.top + scroller.clientHeight);
+  }
+  return bounds;
+};
+
+/**
+ * Clamp a fixed-position menu back inside `bounds` using its rendered rect. Shifts by how far the
+ * rect overflows each edge, so the result is correct regardless of the menu's containing block.
+ *
+ * @param {{ left: string, top: string }} position - Current CSS position (px strings).
+ * @param {{ left: number, top: number, right: number, bottom: number }} rect - Rendered menu rect.
+ * @param {{ left: number, top: number, right: number, bottom: number }} bounds - Allowed area.
+ * @param {number} [gutter=8] - Minimum gap from each edge.
+ * @returns {{ left: string, top: string }}
+ */
+export const clampMenuPositionToBounds = (position, rect, bounds, gutter = 8) => {
+  let left = parseFloat(position.left) || 0;
+  let top = parseFloat(position.top) || 0;
+
+  // Clamp an axis only when the menu fits; a larger menu renders as-is (shifting just trades edges).
+  const fitsX = rect.right - rect.left <= bounds.right - bounds.left - 2 * gutter;
+  const fitsY = rect.bottom - rect.top <= bounds.bottom - bounds.top - 2 * gutter;
+
+  if (fitsX) {
+    if (rect.right > bounds.right - gutter) left -= rect.right - (bounds.right - gutter);
+    else if (rect.left < bounds.left + gutter) left += bounds.left + gutter - rect.left;
+  }
+
+  if (fitsY) {
+    if (rect.bottom > bounds.bottom - gutter) top -= rect.bottom - (bounds.bottom - gutter);
+    else if (rect.top < bounds.top + gutter) top += bounds.top + gutter - rect.top;
+  }
+
+  return { left: `${left}px`, top: `${top}px` };
+};
diff --git a/packages/super-editor/src/editors/v1/components/context-menu/tests/menu-position.test.js b/packages/super-editor/src/editors/v1/components/context-menu/tests/menu-position.test.js
new file mode 100644
index 0000000000..53e3f90876
--- /dev/null
+++ b/packages/super-editor/src/editors/v1/components/context-menu/tests/menu-position.test.js
@@ -0,0 +1,87 @@
+import { describe, it, expect } from 'vitest';
+import { clampMenuPositionToBounds, resolveMenuBounds } from '../menu-position.js';
+
+const viewport = { left: 0, top: 0, right: 1000, bottom: 800 };
+
+describe('clampMenuPositionToBounds', () => {
+  it('shifts left when the menu overflows the right edge', () => {
+    const rect = { left: 900, top: 100, right: 1100, bottom: 300 };
+    expect(clampMenuPositionToBounds({ left: '900px', top: '100px' }, rect, viewport)).toEqual({
+      left: '792px',
+      top: '100px',
+    });
+  });
+
+  it('shifts up when the menu overflows the bottom edge', () => {
+    const rect = { left: 100, top: 700, right: 300, bottom: 900 };
+    expect(clampMenuPositionToBounds({ left: '100px', top: '700px' }, rect, viewport)).toEqual({
+      left: '100px',
+      top: '592px',
+    });
+  });
+
+  it('shifts back when the menu is off the left/top edge', () => {
+    const rect = { left: -20, top: -10, right: 180, bottom: 190 };
+    expect(clampMenuPositionToBounds({ left: '-20px', top: '-10px' }, rect, viewport)).toEqual({
+      left: '8px',
+      top: '8px',
+    });
+  });
+
+  it('leaves a fully in-bounds menu unchanged', () => {
+    const rect = { left: 100, top: 100, right: 300, bottom: 300 };
+    expect(clampMenuPositionToBounds({ left: '100px', top: '100px' }, rect, viewport)).toEqual({
+      left: '100px',
+      top: '100px',
+    });
+  });
+
+  it('clears the scroll container scrollbar (bounds narrower than viewport)', () => {
+    // Bounds right 985 (15px scrollbar): a menu at right 990 shifts to bounds.right - gutter = 977.
+    const bounds = { left: 0, top: 0, right: 985, bottom: 760 };
+    const rect = { left: 810, top: 100, right: 990, bottom: 300 };
+    expect(clampMenuPositionToBounds({ left: '810px', top: '100px' }, rect, bounds)).toEqual({
+      left: '797px',
+      top: '100px',
+    });
+  });
+
+  it('renders as-is on an axis where the menu is larger than the bounds', () => {
+    // 200x320 menu cannot fit in 180x240 bounds; shifting would only trade edges, so leave it.
+    const bounds = { left: 0, top: 0, right: 180, bottom: 240 };
+    const rect = { left: 40, top: 30, right: 240, bottom: 350 };
+    expect(clampMenuPositionToBounds({ left: '40px', top: '30px' }, rect, bounds)).toEqual({
+      left: '40px',
+      top: '30px',
+    });
+  });
+});
+
+describe('resolveMenuBounds', () => {
+  const makeView = (clientW, clientH, computed) => ({
+    document: { documentElement: { clientWidth: clientW, clientHeight: clientH } },
+    getComputedStyle: (el) => computed.get(el) ?? { overflowX: 'visible', overflowY: 'visible' },
+  });
+
+  it('returns the viewport when there is no scrollable ancestor', () => {
+    const el = { parentElement: null };
+    const view = makeView(1000, 800, new Map());
+    expect(resolveMenuBounds(el, view)).toEqual({ left: 0, top: 0, right: 1000, bottom: 800 });
+  });
+
+  it('intersects with the scroll container content box (excludes its scrollbar)', () => {
+    const scroller = {
+      parentElement: null,
+      clientWidth: 985, // 15px vertical scrollbar
+      clientHeight: 445,
+      getBoundingClientRect: () => ({ left: 0, top: 315 }),
+    };
+    const anchor = { parentElement: scroller };
+    const computed = new Map([
+      [anchor, { overflowX: 'visible', overflowY: 'visible' }],
+      [scroller, { overflowX: 'hidden', overflowY: 'auto' }],
+    ]);
+    const view = makeView(1000, 760, computed);
+    expect(resolveMenuBounds(anchor, view)).toEqual({ left: 0, top: 315, right: 985, bottom: 760 });
+  });
+});