A free program for Android, by Banix Studio.

Calculator Vault – Hide U is an app that allows you to securely hide photos, videos, and other files without anyone else knowing. It is a privacy protection app that lets you hide photos, videos, and other files and protects them with a PIN code.

The files are hidden in the app and can only be viewed after you enter the correct PIN code. The hidden files are protected by the PIN code and are not stored online.

You can use this app on your Android phone or tablet.

Calculator Vault – Hide U supports the Android 7.0 version and above.