diff --git a/packages/super-editor/src/editors/v1/core/renderers/ProseMirrorRenderer.ts b/packages/super-editor/src/editors/v1/core/renderers/ProseMirrorRenderer.ts
index fb20253bcd..8c6c891c49 100644
--- a/packages/super-editor/src/editors/v1/core/renderers/ProseMirrorRenderer.ts
+++ b/packages/super-editor/src/editors/v1/core/renderers/ProseMirrorRenderer.ts
@@ -42,6 +42,7 @@ const RESIZE_DEBOUNCE_MS = 150;
  * This value provides consistent vertical spacing and improves readability.
  */
 const DEFAULT_LINE_HEIGHT = 1.2;
+const HEADER_FOOTER_LINE_HEIGHT = 1;
 
 /**
  * Listener cleanup function type for tracking registered event listeners.
@@ -617,7 +618,9 @@ export class ProseMirrorRenderer implements EditorRenderer {
     }
 
     // Line height
-    proseMirror.style.lineHeight = String(DEFAULT_LINE_HEIGHT);
+    proseMirror.style.lineHeight = editor.options.isHeaderOrFooter
+      ? String(HEADER_FOOTER_LINE_HEIGHT)
+      : String(DEFAULT_LINE_HEIGHT);
 
     // Mobile styles
     element.style.transformOrigin = 'top left';
diff --git a/tests/behavior/tests/headers/header-footer-line-height.spec.ts b/tests/behavior/tests/headers/header-footer-line-height.spec.ts
new file mode 100644
index 0000000000..89bbb5a138
--- /dev/null
+++ b/tests/behavior/tests/headers/header-footer-line-height.spec.ts
@@ -0,0 +1,100 @@
+import fs from 'node:fs';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+import { test, expect } from '../../fixtures/superdoc.js';
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+const DOC_PATH = path.resolve(__dirname, '../../test-data/pagination/longer-header.docx');
+
+test.skip(!fs.existsSync(DOC_PATH), 'Test document not available — run pnpm corpus:pull');
+
+test('header editor uses line-height 1, not the default 1.2', async ({ superdoc }) => {
+  await superdoc.loadDocument(DOC_PATH);
+  await superdoc.waitForStable();
+
+  const header = superdoc.page.locator('.superdoc-page-header').first();
+  await header.waitFor({ state: 'visible', timeout: 15_000 });
+
+  // Double-click to enter header edit mode
+  const box = await header.boundingBox();
+  expect(box).toBeTruthy();
+  await superdoc.page.mouse.dblclick(box!.x + box!.width / 2, box!.y + box!.height / 2);
+  await superdoc.waitForStable();
+
+  const editorHost = superdoc.page.locator('.superdoc-header-editor-host').first();
+  await editorHost.waitFor({ state: 'visible', timeout: 10_000 });
+
+  // The ProseMirror element inside the header editor should have lineHeight: 1
+  // (matching OOXML Header style w:line="240" w:lineRule="auto" = 240/240 = 1.0)
+  const pm = editorHost.locator('.ProseMirror');
+  await expect(pm).toHaveCSS('line-height', /^\d+(\.\d+)?px$/);
+
+  const lineHeight = await pm.evaluate((el) => el.style.lineHeight);
+  expect(lineHeight).toBe('1');
+});
+
+test('footer editor uses line-height 1, not the default 1.2', async ({ superdoc }) => {
+  await superdoc.loadDocument(DOC_PATH);
+  await superdoc.waitForStable();
+
+  const footer = superdoc.page.locator('.superdoc-page-footer').first();
+  await footer.scrollIntoViewIfNeeded();
+  await footer.waitFor({ state: 'visible', timeout: 15_000 });
+
+  // Double-click to enter footer edit mode
+  const box = await footer.boundingBox();
+  expect(box).toBeTruthy();
+  await superdoc.page.mouse.dblclick(box!.x + box!.width / 2, box!.y + box!.height / 2);
+  await superdoc.waitForStable();
+
+  const editorHost = superdoc.page.locator('.superdoc-footer-editor-host').first();
+  await editorHost.waitFor({ state: 'visible', timeout: 10_000 });
+
+  const pm = editorHost.locator('.ProseMirror');
+  const lineHeight = await pm.evaluate((el) => el.style.lineHeight);
+  expect(lineHeight).toBe('1');
+});
+
+test('body editor still uses default line-height 1.2', async ({ superdoc }) => {
+  await superdoc.loadDocument(DOC_PATH);
+  await superdoc.waitForStable();
+
+  // The body editor's ProseMirror should retain the default 1.2 line height
+  const lineHeight = await superdoc.page.evaluate(() => {
+    const editor = (window as any).editor;
+    const pm = editor?.view?.dom as HTMLElement | undefined;
+    return pm?.style.lineHeight;
+  });
+  expect(lineHeight).toBe('1.2');
+});
+
+test('header content is not clipped when entering edit mode', async ({ superdoc }) => {
+  await superdoc.loadDocument(DOC_PATH);
+  await superdoc.waitForStable();
+
+  const header = superdoc.page.locator('.superdoc-page-header').first();
+  await header.waitFor({ state: 'visible', timeout: 15_000 });
+
+  // Double-click to enter header edit mode
+  const box = await header.boundingBox();
+  expect(box).toBeTruthy();
+  await superdoc.page.mouse.dblclick(box!.x + box!.width / 2, box!.y + box!.height / 2);
+  await superdoc.waitForStable();
+
+  const editorHost = superdoc.page.locator('.superdoc-header-editor-host').first();
+  await editorHost.waitFor({ state: 'visible', timeout: 10_000 });
+
+  // The ProseMirror content should not overflow the editor host container
+  const overflow = await editorHost.evaluate((host) => {
+    const pm = host.querySelector('.ProseMirror') as HTMLElement;
+    if (!pm) return { error: 'no PM' };
+    return {
+      pmScrollHeight: pm.scrollHeight,
+      pmOffsetHeight: pm.offsetHeight,
+      hostHeight: host.offsetHeight,
+      isOverflowing: pm.scrollHeight > host.offsetHeight,
+    };
+  });
+  expect(overflow).not.toHaveProperty('error');
+  expect(overflow.isOverflowing).toBe(false);
+});