Calculator Vault: Photo Locker is a free secure app that allows you to share personal information with friends and family and also protect your privacy. The calculator can generate a secure random password that you can use to access your hidden files. This tool has a built-in password manager. 

The app supports a variety of formats and will hide any type of file, including photos, videos, audio, and documents. The tool is capable of hiding data for a long time. The private files can be restored in the event of loss or theft. You can also recover your files in the event of a device failure.