Proton Mail Desktop — App Portable

Because the entire browser profile—including cookies, cache, and local storage—is saved inside the USB folder, your session remains entirely on the drive. 2. Standard Electron App Virtualization (Advanced)

@echo off start "" "%~dp0Proton Mail.exe" --user-data-dir="%~dp0data" Use code with caution.

Install the official Proton Mail desktop app on a test machine. proton mail desktop app portable

No, Proton does not currently distribute an official portable executable ( .exe or .app ) for its desktop client.

Since no official portable app exists, here are the best alternatives — ranked from most to least portable. Install the official Proton Mail desktop app on

Potentially accessing stored emails without an internet connection. Alternatives for Portable Proton Mail Access

Do you need to your old emails while on the go? is an open-source

If you want a true standalone "app" experience, is an open-source, community-driven client for Proton Mail that is widely trusted.