Proton Drive encrypts files, names and folders before upload

Now the case for trust: Proton Drive is end-to-end encrypted by default, and that encryption covers file contents, file names, and folder structure, not just the file body, so Proton cannot read your files or even see what you named them.

Proton Drive emphasises security ... preventing unauthorised access. Zero-Knowledge Architecture – Proton cannot view your files, ensuring maximum privacy....

Our end-to-end encryption means no one, not even Proton, can access your files and folders or see their names without your permission. Proton Drive also supports end-to-end encrypted file sharing.

Cloud storage providers typically ... Drive security model below if you’re interested in the details. Proton Drive uses zero-knowledge encryption....

Your data remains completely opaque to them. Yes. Some secure cloud storage providers only encrypt the contents of your files, leaving metadata like file names, folder structures, and file sizes visible.

Proton Drive is genuinely zero-knowledge: files are encrypted on your device before upload, so Proton cannot read them.

The coding for this encryption is also entirely open-source, so anyone can verify these claims. Proton’s privacy policy reiterates its company model of collecting as little of your data as possible. The policy also details all third-party providers that could interact with your data and why this is necessary for the Proton service. ... Proton Drive customer support includes a help ticket system, a knowledge base and direct email support, but no live chat.

Proton Drive applies zero-knowledge encryption on the files stored in its vault.

The encryption keys are derived from your password and never transmitted to Proton. That is what people mean by "zero-access" or "zero-knowledge" encryption — Proton literally cannot read your files, even under subpoena.