A free app for Android, by NQ Mobile Security NYSE:NQ.

Vault Calculator is an easy-to-use, free, and secure way to hide your photos, videos, and personal information from others. It can also be used as a secure password generator for various online services.

Vault Calculator can be used to encrypt and decrypt your photos, videos, and personal information. This means that you can hide all the files on your device and keep them safe from prying eyes. 

To hide photos, videos, and personal information, all you have to do is input the Vault password on the calculator panel and tap “encrypt.”

Vault Calculator supports various formats and works on all Android devices.