diff --git a/resources/js/guest/context/NotificationCenterContext.tsx b/resources/js/guest/context/NotificationCenterContext.tsx
index 74d6c388..817b8f08 100644
--- a/resources/js/guest/context/NotificationCenterContext.tsx
+++ b/resources/js/guest/context/NotificationCenterContext.tsx
@@ -8,6 +8,7 @@ import {
   type GuestNotificationItem,
 } from '../services/notificationApi';
 import { fetchPendingUploadsSummary } from '../services/pendingUploadsApi';
+import { updateAppBadge } from '../lib/badges';
 
 export type NotificationCenterValue = {
   notifications: GuestNotificationItem[];
@@ -265,6 +266,10 @@ export function NotificationCenterProvider({ eventToken, children }: { eventToke
   const loading = loadingNotifications || queueLoading || pendingLoading;
   const totalCount = unreadCount + queueCount + pendingCount;
 
+  React.useEffect(() => {
+    void updateAppBadge(totalCount);
+  }, [totalCount]);
+
   const value: NotificationCenterValue = {
     notifications,
     unreadCount,
diff --git a/resources/js/guest/lib/__tests__/badges.test.ts b/resources/js/guest/lib/__tests__/badges.test.ts
new file mode 100644
index 00000000..cb547d5d
--- /dev/null
+++ b/resources/js/guest/lib/__tests__/badges.test.ts
@@ -0,0 +1,52 @@
+import { afterEach, describe, expect, it, vi } from 'vitest';
+import { supportsBadging, updateAppBadge } from '../badges';
+
+const originalSet = (navigator as any).setAppBadge;
+const originalClear = (navigator as any).clearAppBadge;
+const hadSet = 'setAppBadge' in navigator;
+const hadClear = 'clearAppBadge' in navigator;
+
+function restoreNavigator() {
+  if (hadSet) {
+    Object.defineProperty(navigator, 'setAppBadge', { configurable: true, value: originalSet });
+  } else {
+    delete (navigator as any).setAppBadge;
+  }
+  if (hadClear) {
+    Object.defineProperty(navigator, 'clearAppBadge', { configurable: true, value: originalClear });
+  } else {
+    delete (navigator as any).clearAppBadge;
+  }
+}
+
+describe('badges', () => {
+  afterEach(() => {
+    restoreNavigator();
+  });
+
+  it('sets the badge count when supported', async () => {
+    const setAppBadge = vi.fn();
+    Object.defineProperty(navigator, 'setAppBadge', { configurable: true, value: setAppBadge });
+    Object.defineProperty(navigator, 'clearAppBadge', { configurable: true, value: vi.fn() });
+
+    expect(supportsBadging()).toBe(true);
+    await updateAppBadge(4);
+    expect(setAppBadge).toHaveBeenCalledWith(4);
+  });
+
+  it('clears the badge when count is zero', async () => {
+    const clearAppBadge = vi.fn();
+    Object.defineProperty(navigator, 'setAppBadge', { configurable: true, value: vi.fn() });
+    Object.defineProperty(navigator, 'clearAppBadge', { configurable: true, value: clearAppBadge });
+
+    await updateAppBadge(0);
+    expect(clearAppBadge).toHaveBeenCalled();
+  });
+
+  it('no-ops when unsupported', async () => {
+    delete (navigator as any).setAppBadge;
+    delete (navigator as any).clearAppBadge;
+    expect(supportsBadging()).toBe(false);
+    await updateAppBadge(3);
+  });
+});
diff --git a/resources/js/guest/lib/badges.ts b/resources/js/guest/lib/badges.ts
new file mode 100644
index 00000000..5fc44c91
--- /dev/null
+++ b/resources/js/guest/lib/badges.ts
@@ -0,0 +1,46 @@
+type BadgingNavigator = Navigator & {
+  setAppBadge?: (contents?: number) => Promise<void> | void;
+  clearAppBadge?: () => Promise<void> | void;
+};
+
+function getNavigator(): BadgingNavigator | null {
+  if (typeof navigator === 'undefined') {
+    return null;
+  }
+  return navigator as BadgingNavigator;
+}
+
+export function supportsBadging(): boolean {
+  const nav = getNavigator();
+  return Boolean(nav && (typeof nav.setAppBadge === 'function' || typeof nav.clearAppBadge === 'function'));
+}
+
+export async function updateAppBadge(count: number): Promise<void> {
+  const nav = getNavigator();
+  if (!nav) {
+    return;
+  }
+
+  const safeCount = Number.isFinite(count) ? Math.max(0, Math.floor(count)) : 0;
+  if (!supportsBadging()) {
+    return;
+  }
+
+  try {
+    if (safeCount > 0 && nav.setAppBadge) {
+      await nav.setAppBadge(safeCount);
+      return;
+    }
+
+    if (nav.clearAppBadge) {
+      await nav.clearAppBadge();
+      return;
+    }
+
+    if (nav.setAppBadge) {
+      await nav.setAppBadge(0);
+    }
+  } catch (error) {
+    console.warn('Updating app badge failed', error);
+  }
+}