Cryptomator

Cryptomator is a free, open-source client-side encryption tool that protects your files stored in cloud services like Dropbox, Google Drive, OneDrive, and others. It creates encrypted vaults on your local machine that sync to the cloud as encrypted files, ensuring that only you can access your data even if the cloud provider is compromised. The app works transparently by mounting encrypted folders as virtual drives, allowing you to work with your files normally while they remain encrypted in the cloud. Cryptomator is popular among privacy-conscious users, businesses handling sensitive documents, and anyone who wants an extra layer of security for their cloud-stored files.