Cryptomator is an open-source encryption tool that adds a layer of client-side encryption to cloud storage services like Dropbox, Google Drive, and OneDrive, allowing you to encrypt files before they're uploaded. Developers can use it to build privacy-focused applications, integrate encryption into cloud workflows, or understand how to implement secure file encryption in Java. It provides transparent, folder-level encryption so files remain encrypted on the cloud provider's servers while remaining accessible locally.

280 open issues · last updated Jul 22, 2026