factually
Index/Topics/Proton web and mobile clients

Proton web and mobile clients

Proton's web and mobile clients perform end-to-end encryption for message bodies between Proton accounts

Fact-Checks

2 results
Jan 27, 2026
Most Viewed

What specific account data does Proton retain and how long is it stored?

retains a narrow set of account metadata necessary to operate its services (message counts, storage usage, last login times), temporary verification data for anti-spam and security, limited payment tr...

Feb 4, 2026

What user-side forensic or metadata remains accessible after using ProtonMail Bridge?

Mail Bridge reduces server-side exposure by providing end-to-end encryption between Proton’s servers and a local desktop client, and Proton states it “never permanently store[s] your PGP keys or decry...