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2FA adds a second step to signing in, on top of your password — usually a one-time code from an authenticator app. An attacker then needs more than just your password to get into your account.

An authenticator app generates time-based one-time passwords (TOTP) on your device. You scan a QR code once, and it produces a fresh 6-digit code every 30 seconds — no internet required.

Even if your password is leaked or guessed, your account stays protected because the attacker can't produce your one-time code. It's one of the most effective ways to prevent account takeover.

Open the security settings of the service, choose “Authenticator app”, then scan the QR code with the Authenticator App to start generating codes. See the per-service guides in our Guides section.

When enabling 2FA, the service shows a QR code plus a “can't scan / manual entry” option that reveals a text secret key. Enter that key in the app if you can't scan.

Use Settings → Import/Export to import from another app, or re-add each account by disabling and re-enabling 2FA on each service.

Add your accounts to the app, verify a generated code works, then remove SMS as the default 2FA method in each service's security settings.

In Facebook → Settings → Security → Two-factor authentication, choose “Authentication app”, then scan the QR code with the Authenticator App.

In Instagram → Accounts Center → Password and security → Two-factor authentication, pick “Authentication app” and scan the QR code.

Your vault is end-to-end encrypted and backed up to your private iCloud, then synced automatically to your other devices.

Install the app, sign in with the same Apple ID, and your encrypted iCloud backup restores automatically.

Make sure iCloud sync is enabled and you're signed in with the same Apple ID on each device. Sync can take a moment after adding a new account.

Go to Settings → Import/Export to export an encrypted backup file, or import codes from another authenticator app.

In Settings → Security, turn on Auto-Lock and choose how quickly the app should lock.

If you enabled iCloud backup you can restore after reinstalling. Otherwise the encrypted vault can't be opened without the password — by design, for your security.

Manage it from the App Store: Settings → your Apple ID → Subscriptions → Authenticator App → Cancel Subscription.

Long-press your Home Screen, tap +, search “Authenticator App”, and add the widget.

Install it via the Watch app; once synced, your codes appear right on your wrist.

In macOS System Settings → General → Login Items, add the Authenticator App.

Sign out and back into iCloud, make sure you have a network connection, then relaunch the app.

This means too many sync requests in a short time. Wait a few minutes and try again, or check your iCloud storage.