Folder Lock

Folder Lock is an app to password-protect any type of folder on your Android. This way, you can protect your photos and videos and ensure you're the only one who can access them.

Of course, besides photos and videos (the most common files on Androids), you can also protect text docs and even audio files with sensitive content, including voice memos and also financial documents you may have stored on your Android.

You can choose from three different protection methods: a password, an unlock pattern, or a PIN.

Folder Lock is an interesting security app. With it, you can protect your most sensitive files from prying eyes.