Cryptomator

Cryptomator makes your cloud storage trustworthy. The app encrypts files on your mobile device before they are uploaded to your cloud. Even if a third party gained unauthorized access to your files (e.g., hacker attack), your files are secure from prying eyes. Cryptomator has been developed with a strong focus on user-friendliness. Cryptomator is compatible with the most commonly used cloud storages and available for all major operating systems. Cryptomator for Android is based on the solid open-source foundation of Cryptomator for Desktop.