To lock gallery albums, use built-in features like Samsung's Gallery Labs for specific albums or Google Photos' Locked Folder for cross-device privacy; otherwise, third-party app lockers can secure the entire gallery app on any Android device, while iPhone users can use the Hidden Album in Photos for a simpler approach.
You can also choose to turn on backup for Locked Folder at this time.
Gallery Lock files are encrypted media files that can only be accessed through the Gallery Lock app. These files are hidden from the regular gallery and require a password to be unlocked. Gallery Lock files use advanced encryption techniques to secure your private photos and videos.
Locked Folder keeps items hidden and protected by your device screen lock or Google Account password. Archived items can still be accessible. Locked Folder items won't show up when you search in Google Photos, while archived items will show up.
Right-click (or press and hold) a file or folder and select Properties from the drop-down menu. In the General tab, click on the Advanced button on the right. Tick the check box next to Encrypt contents to secure data. Click OK to close the Advanced Attributes window.
Setting up a locked folder on Google Photos
To set up the folder, open the app, go to Library, and click on Utilities. You'll find a Locked folder option at the bottom. Once you tap on it, you'll be prompted to enter a password that is the same as your device password.
Protect your files with Safe folder
How do I Hide & Unhide Albums in my Gallery?
Open the Secure Folder app to view your protected files.
You'll find it in the app drawer. Once launched, you'll have to enter your security credentials to view the files inside. Nobody will be able to access these photos unless they have your PIN, Password, or other credentials.
Folder Lock® lets you password-protect your personal files, photos, videos, documents, contacts, wallet cards, notes and audio recordings in Android Phones.
This feature is integrated directly into the Google Photos app, and accessing the Locked Folder requires your device's screen lock (PIN, pattern, or password). The exact terminology and location of these features can differ slightly depending on your specific Android version and the manufacturer's custom interface.