What app locking does and which Android phones have it built in
App locking restricts who can open a specific app on your phone — usually by requiring a PIN, pattern, fingerprint, or face recognition before the app will launch. Once locked, someone who picks up your phone cannot open that app without entering the correct unlock method, even if they know your phone's main password.
Most modern Android phones (Samsung, Google Pixel, OnePlus, Motorola) include app locking as a built-in feature. The exact name and location varies: Samsung calls it "Secure Folder" or "App Lock", Google Pixel uses "App Lock", and some phones hide it under Settings > Security or Settings > Privacy. Older Android phones or budget models may not have this feature at all — if you cannot find it in your settings, a third-party app from the Google Play Store is your alternative.
App locking is different from your phone's main lock screen. Your main lock protects everything on the phone; app locking protects only the apps you choose, so someone could still see your home screen, contacts, or photos unless you lock those apps too.
Key Takeaways
- Most Android phones have app locking built into Settings under Security or Privacy, though Samsung and Google Pixel phones have their own dedicated app lock features.
- You can lock individual apps with a PIN, pattern, fingerprint, or face unlock — the same methods your phone already uses.
- Locking an app does not hide it from your home screen; it only prevents the app from opening without your unlock method.
- If your phone does not have built-in app locking, third-party apps from the Google Play Store can lock apps, though they require permissions to monitor your phone.
- Forgetting your app lock PIN or pattern can lock you out of that app permanently on some phones, so write it down or use a method you use daily.
How to lock apps on Samsung phones
Samsung phones use either "Secure Folder" (for high-security locking) or "App Lock" (for quick per-app locking). Most people want App Lock because it is faster to set up.
Open Settings, then tap Security or Biometrics and Security. Look for "App Lock" or "App protection" — the exact name depends on your Samsung model. Tap it, then tap the toggle to turn it on. You will be asked to set a PIN, pattern, or biometric (fingerprint or face). Use something you remember; if you forget it, you may not be able to unlock that app without a factory reset.
Once App Lock is on, go back to the same menu and tap "Manage apps" or "Protected apps". Tap the plus icon or toggle next to each app you want to lock. The next time someone tries to open that app, they will see your unlock screen. You can lock as many or as few apps as you want.
How to lock apps on Google Pixel phones
Google Pixel phones have a dedicated App Lock feature built into Settings. Open Settings, tap Security and privacy, then scroll down and tap App Lock. You will see a list of apps that can be locked.
Tap each app you want to lock, then tap the toggle to turn it on. Google Pixel will ask you to confirm your phone's unlock method (PIN, pattern, or biometric). Once confirmed, that app is locked. The next time it is opened, the unlock screen will appear before the app launches.
Unlike some other phones, Pixel's App Lock uses your existing phone unlock method — you cannot set a separate PIN just for apps. This makes it simpler but means anyone who can unlock your phone can also open your locked apps.
How to lock apps on other Android phones
If your phone is made by Motorola, OnePlus, Nokia, or another manufacturer, check Settings > Security or Settings > Privacy first. Look for "App Lock", "App protection", "Protected apps", or "Locked apps". The feature may also be inside a folder called "Advanced security" or "Security and privacy".
If you find it, the process is usually the same: turn on the feature, set a PIN or pattern, then select which apps to lock. If you cannot find it after checking Security and Privacy, your phone may not have built-in app locking. In that case, move to the third-party app section below.
Using a third-party app to lock apps
If your phone does not have built-in app locking, download an app lock app from the Google Play Store. Popular options include AppLock, Norton App Lock, and Keepsafe. Search "app lock" in the Play Store and read the reviews before downloading — look for apps with at least 4 stars and recent updates.
After installing, open the app and follow its setup steps. You will be asked to set a PIN, pattern, or biometric unlock. Then select which apps you want to lock from the list shown. The app will now intercept those apps when they are opened and show your unlock screen.
Third-party app lock apps require permission to monitor your phone's activity, which is why they can intercept app launches. Only download from the official Google Play Store, not from other websites, to reduce the risk of installing malware. If an app lock app asks for permissions that seem unrelated to locking (like access to your contacts or messages), do not install it.
What happens when someone tries to open a locked app
When a locked app is tapped, the unlock screen appears immediately — before the app even loads. The person trying to open it will see your chosen unlock method: a PIN pad, a pattern grid, a fingerprint prompt, or a face recognition screen, depending on what you set up.
They have a limited number of attempts (usually 5 to 10) before the app lock temporarily blocks further attempts. On some phones, repeated failed attempts will lock the app for several minutes. If they enter the correct unlock method, the app opens normally and they can use it until they close it.
Closing and reopening the app will trigger the unlock screen again. The lock does not stay "open" — each time the app is launched, the unlock is required.
Common mistakes and how to avoid them
The most common mistake is forgetting your app lock PIN or pattern. Unlike your phone's main lock, many app lock features do not have a recovery option — if you forget it, you may be permanently locked out of that app. Write down your PIN or pattern somewhere safe, or use a method you enter every day (like your phone's main unlock code).
Another mistake is locking too many apps and forgetting which ones are locked. You will only discover this when you try to open an app and the unlock screen appears unexpectedly. Keep a mental note of which apps you locked, or check your app lock settings occasionally to remember.
Do not assume app locking hides the app from your home screen — it does not. The app icon stays visible; it just cannot be opened without your unlock method. If you want to hide an app completely, you need a different feature (usually called "Hide apps" or "Secure Folder" on Samsung phones).
Frequently Asked Questions
Can I lock the Settings app so someone cannot change my phone's settings?
Yes, most app lock features let you lock Settings, just like any other app. However, if someone knows your phone's main unlock code, they can usually bypass app locks by restarting the phone or accessing Settings through other routes. App locking is best for preventing casual access, not for stopping someone determined to change your phone.
What happens to a locked app if I restart my phone?
The lock stays in place. After you restart, the app will still be locked and will require your unlock method the next time you try to open it. The lock does not reset or disappear.
Can I use a different PIN for app lock than my phone's main lock?
On Samsung and most other Android phones, yes — you can set a separate PIN just for app locking. On Google Pixel, app lock uses your phone's existing unlock method, so you cannot set a different PIN. Check your phone's app lock settings to see which option applies to you.
Will app locking slow down my phone?
Built-in app locking has no noticeable effect on speed. Third-party app lock apps may use slightly more battery and memory because they run in the background, but the difference is usually too small to notice on modern phones.
Can I lock an app on someone else's phone without their knowledge?
No. App locking requires access to that phone's Settings and the ability to set a PIN or biometric. You cannot lock an app remotely or without physical access to the phone.