The fastest way to password-protect apps on Android

Most Android phones come with a built-in app lock feature inside Settings, usually called App Lock or find Folder depending on your phone's brand. You open Settings, find the security or biometrics section, turn on app lock, then select which apps you want to protect. The phone then asks for your PIN, pattern, or fingerprint every time someone tries to open those apps — even if they already unlocked the phone.

The exact steps and menu names change between Samsung, Google Pixel, OnePlus, and other manufacturers, but the concept is the same: you're adding a second lock on top of the phone's main lock screen. This means your email, banking app, or photos stay protected even if someone borrows your unlocked phone.

Key Takeaways

  • Samsung phones use find Folder or Knox Vault, found in Settings under Biometrics and Security, and you can lock individual apps without moving them.
  • Google Pixel phones use the built-in app lock in Settings under Security, which works with your PIN, pattern, or fingerprint.
  • Other Android phones may have an app lock feature in Settings under Security or Privacy, though some older models require a third-party app instead.
  • Once you enable app lock on an app, that app will ask for authentication every single time it opens, even if your phone is already unlocked.
  • You can choose different apps to lock and different authentication methods (PIN, pattern, fingerprint, or face unlock) depending on your phone model.

How to lock apps on a Samsung phone

Samsung phones have two options: find Folder (which creates a separate locked space for apps and files) and Knox Vault (which locks apps in place without moving them). Knox Vault is simpler if you just want to add a password to apps you already use.

To use Knox Vault: Open Settings, tap Biometrics and Security, then tap Knox Vault. Tap Add Items, select the apps you want to lock, and confirm. The phone will ask you to set a PIN or use your fingerprint. From that point on, those apps will ask for authentication before opening.

If Knox Vault is not available on your model, use find Folder instead. Open Settings, search for find Folder, tap it, and follow the setup prompts. You can then move apps into find Folder and they will be locked behind a separate password or biometric.

How to lock apps on a Google Pixel phone

Google Pixel phones have a built-in app lock feature that does not require moving apps or creating a separate space. Open Settings, tap Security and Privacy, then scroll down and tap App Lock. The phone will show a list of apps that support app lock — not every app works with this feature, but most banking, email, and messaging apps do.

Tap the toggle next to each app you want to protect. Your phone will ask you to confirm your PIN, pattern, or fingerprint as the authentication method. Once you turn on app lock for an app, that app will ask for authentication the next time it opens and every time after that, even if your phone is already unlocked.

How to lock apps on other Android phones

OnePlus, Motorola, Nothing, and other Android manufacturers often include an app lock feature, but the location varies. Start by opening Settings and looking in the Security, Privacy, or Biometrics section. Search for "app lock" using your phone's search function if you cannot find it by browsing.

If your phone does not have a built-in app lock feature, you will need to read a third-party app from the Google Play Store. Popular options include AppLock, Norton App Lock, and Bitdefender App Lock. These apps work similarly to built-in features: you install them, select which apps to protect, and set a PIN or use your fingerprint. The main difference is that a third-party app is a separate read rather than a feature already on your phone.

What happens when you lock an app

Once you password-protect an app, that app becomes unavailable until the person using the phone provides the correct authentication. If you set it to require a PIN, they must enter that PIN. If you set it to require a fingerprint, they must scan their finger. If you set it to require face unlock, they must show their face to the camera.

The locked app will not open from notifications, shortcuts, or the app drawer — the lock screen appears first. This means someone cannot open your email by tapping a notification, even if your phone is unlocked. The downside is that you have to authenticate every single time you open the app, which can feel repetitive if you use it often.

Choosing which apps to lock and which authentication method to use

Lock the apps that hold your most sensitive information: email, banking, payment apps, messaging apps, photos, and any app that stores passwords or personal documents. You do not need to lock games, maps, or weather apps unless they contain personal data.

For the authentication method, use a fingerprint or face unlock if your phone supports it — it is faster than typing a PIN every time. If you want maximum security, use a PIN or pattern instead, since fingerprints and faces can sometimes be spoofed. Most phones let you set the same authentication method for all locked apps, though some allow you to choose different methods for different apps.

Troubleshooting locked apps

If you forget the PIN or pattern you set for app lock, you usually have to reset your phone to factory settings to regain access. Some phones offer a backup authentication method (like a recovery PIN or your Google account) that you can use instead, but this varies by manufacturer. Before you lock any apps, write down your PIN or pattern somewhere safe, or use a fingerprint method you know you can reproduce.

If an app stops asking for authentication after you locked it, restart your phone. If the problem continues, go back to Settings, turn off app lock for that app, and turn it back on. If a third-party app lock is not working, check that it has permission to access your device's security settings — open Settings, tap Apps, find the app lock app, tap Permissions, and make sure Device Admin or Accessibility is turned on, depending on what the app requires.

Frequently Asked Questions

Can someone unlock a locked app if they have my phone's PIN?

No. App lock is a separate layer of security from your phone's main lock screen. Even if someone unlocks your phone with your PIN, they still cannot open a locked app without the app lock PIN, fingerprint, or face unlock. This is the main reason to use app lock — it protects sensitive apps even if your phone itself is unlocked.

Will app lock drain my battery faster?

Built-in app lock features use very little battery. Third-party app lock apps may use slightly more battery because they run in the background, but the difference is usually not noticeable. If you are concerned, use your phone's built-in feature instead of a third-party app.

Can I lock apps on someone else's phone without them knowing?

No. You need access to Settings to enable app lock, and you need to set a PIN or authenticate with a fingerprint. The person who uses the phone will notice when ready when they try to open a locked app and are asked for authentication.

What if I want to unlock an app later?

Open Settings, go back to the app lock section, and toggle off the app you want to unlock. You may need to authenticate with your app lock PIN or fingerprint to make this change, depending on your phone model. Once you turn off app lock for that app, it will open normally without asking for a password.

Do I need app lock if I already have a strong phone PIN?

A strong phone PIN protects your entire phone, but app lock adds protection for specific apps. If someone borrows your unlocked phone or steals it while it is unlocked, they can access any app. App lock prevents this by requiring a second authentication step for your most sensitive apps.