Most phones and computers let you lock individual apps, but the method depends on your device

You can add a password, PIN, or biometric lock to apps on iPhones, Android phones, Windows computers, and Macs. The steps differ by device and operating system, and some apps have their own built-in locks separate from your device's security settings. On most phones, you use your device's native security tools rather than the app itself. On computers, the process varies more widely — some apps lock themselves, others require third-party software, and some cannot be locked at all.

The reason to lock an app is straightforward: if someone picks up your phone or sits at your computer, they cannot open that app without the password. This matters most for banking apps, email, messaging, photo galleries, or anything containing sensitive information.

Key Takeaways

  • iPhones running iOS 16 or later can lock individual apps using Face ID, Touch ID, or a custom password through Settings > Face ID & Passcode.
  • Android phones use the built-in app lock feature (called App Lock or similar, depending on manufacturer) found in Settings > Security or Biometrics.
  • Windows computers do not have a native app-locking feature; you must use third-party software like 7-Zip with password protection or rely on the app's own security settings.
  • Mac computers can lock apps using third-party tools, but most users instead rely on FileVault full-disk encryption or the app's native password feature.
  • Some apps like banking and email clients have their own password or biometric lock built in, separate from your device's security system.

Locking apps on iPhone

On iPhones with iOS 16 or later, you can lock any app using Face ID, Touch ID, or a custom password. Open Settings, tap Face ID & Passcode (or Touch ID & Passcode on older models), enter your device passcode, scroll down to Apps, and toggle on the apps you want to lock. You can choose whether each app uses Face ID, Touch ID, or a password you create yourself.

When you open a locked app, your iPhone will ask you to authenticate before showing its contents. If you use Face ID or Touch ID, the unlock happens in seconds. If you choose a custom password, you type it each time. You can change which apps are locked at any time by returning to the same Settings menu.

If your iPhone runs iOS 15 or earlier, you do not have this feature built in. Your options are to upgrade your phone, use the app's own password feature if it has one, or use a third-party app locker from the App Store (though these are less secure than the native iOS feature).

Locking apps on Android

Android phones have an app lock feature, though the exact name and location depend on your phone's manufacturer. On Samsung phones, go to Settings > Biometrics and Security > App Lock, then toggle on the apps you want to protect. On Google Pixel phones, the feature is called App Lock and is found in Settings > Security & Privacy > App Lock. Other manufacturers like OnePlus, Motorola, and others have similar features in their security settings.

Once you enable app lock, you can choose whether to unlock with your fingerprint, face recognition, PIN, or pattern. Most Android phones default to the same biometric method you use to unlock your phone, but you can set a separate PIN or pattern for apps if you prefer.

If your Android phone does not have a built-in app lock feature, you can download a third-party app locker from the Google Play Store. Popular options include AppLock and Norton App Lock, though these are less secure than a manufacturer's native feature because they have fewer system-level permissions.

Locking apps on Windows

Windows does not have a built-in feature to lock individual apps with a password. Your main options are to use the app's own security settings, use third-party software, or rely on Windows user account passwords and file encryption.

If the app itself has a password feature — like Outlook, Gmail, or banking apps — use that. Many modern applications include their own biometric or password lock. For apps without built-in locks, you can use third-party tools like 7-Zip (which can password-protect files) or specialized app lockers like Folder Lock or AppGuard, though these require installation and may slow your computer.

A simpler approach for many users is to set up separate Windows user accounts: one for yourself with full access, and a guest or limited account for others. This prevents anyone without your password from logging in to your account at all, which locks them out of all your apps at once.

Locking apps on Mac

Macs do not have a native app-locking feature like iPhones do. Your options are to use the app's own password feature, enable FileVault full-disk encryption, or use third-party software.

If the app has a built-in password or biometric lock — like banking apps or email clients — enable it. For apps without their own locks, FileVault encrypts your entire Mac hard drive and requires your password to start the computer. This locks all your apps at once rather than individually, but it is effective if you are the only person who uses your Mac.

If you want to lock specific apps without encrypting your entire drive, third-party tools like Bluetooth Lock or Folder Lock can password-protect individual applications. These are less common on Mac than on Windows, and most require a subscription or one-time purchase.

Using an app's built-in password feature

Many apps — especially banking, email, messaging, and photo apps — have their own password or biometric lock separate from your device's security system. This lock applies only when you open that specific app, even if someone else has unlocked your phone or computer.

To learn about an app has this feature, open the app and look for Settings, Security, or Privacy in its menu. Common names include "App Lock", "Require Password", "Biometric Authentication", or "Face ID". If the option exists, turn it on and follow the app's instructions to set a password or enable your fingerprint or face.

Using an app's built-in lock is often more secure than your device's app lock because the app controls its own authentication. However, if you forget the password, you may need to contact the app's support team or reset your account — the app cannot unlock itself for you.

What happens if you forget the password

If you forget a password you set for an app lock on your phone, the recovery process depends on whether it is your device's lock or the app's own lock. On iPhone, if you forget a custom app password, you can disable the lock by entering your device passcode in Settings. On Android, the process varies by manufacturer, but you can usually disable app locks through your device settings if you can unlock your phone.

If you forget a password that the app itself set — not your device — you will need to reset it through the app. Most apps offer a "Forgot Password" option or will let you reset it using your email address or phone number. Some banking apps require you to call customer support to reset an app-specific password.

Frequently Asked Questions

Can I lock an app with a different password than my phone's lock?

Yes. On iPhone, you can set a custom password for each app that is different from your device passcode. On Android, you can set a separate PIN or pattern for app locks. On computers, if you use third-party software, you can set unique passwords for each app. However, most people use the same biometric method (fingerprint or face) for both device and app locks for convenience.

Does locking an app slow down my phone?

No. Using your device's native app lock feature — Face ID, Touch ID, or a PIN on iPhone or Android — has no measurable impact on performance. Third-party app lockers on Android or Windows may use slightly more battery or memory, but the difference is usually not noticeable.

Can someone bypass an app lock?

A device's native app lock (iPhone's Face ID/Touch ID or Android's biometric lock) is as secure as your device's main lock. Third-party app lockers are less secure because they have fewer system-level permissions. An app's own built-in password is only as secure as the password you choose — use a strong, unique password if the app allows it.

Will locking an app prevent notifications from showing?

No. Notifications from a locked app will still appear on your lock screen or notification center. The lock only prevents someone from opening the app itself and seeing its full contents. If you want to hide notifications too, you must adjust your notification settings separately in your device's settings.

Do I need to lock every app or just sensitive ones?

Lock only the apps that contain sensitive information: banking, email, messaging, photos, health data, or anything you would not want someone else to see. Locking every app is unnecessary and adds friction each time you use your phone. Focus on the apps that matter most to your privacy.