Proton Mail Desktop App Portable ✦ Direct & Verified

Third-party developers have created portable wrappers for Proton Mail, though these are not endorsed by Proton and should be vetted for security: ElectronMail

Disclaimer: This method is not supported by Proton. It works as of 2025, but may break with updates. Use at your own risk. Never plug a USB with decrypted Proton Mail data into an untrusted computer. proton mail desktop app portable

Currently, Proton provides official installers for Windows (.exe), macOS (.dmg), and Linux (.deb/.rpm). While they haven't released a "PAF" (PortableApps.com format) version yet, the community has found ways to make it work. Never plug a USB with decrypted Proton Mail

Uses Proton’s full web interface; perfectly secure; no third-party software. Cons: Slower than a native app; consumes more RAM. Uses Proton’s full web interface; perfectly secure; no

For true offline access or native notifications on your own machines, install the official desktop app. But for a clean, portable workflow—the browser is still king.