Method 3: Advanced Command-Line Isolation (Chromium Sandbox)
Click the browser's three-dot menu (top right) and navigate to > Save and Share > Create Shortcut . Check the box that says Open as window and click Create .
As of now, Proton officially offers a desktop app for Windows, macOS, and Linux. However, they do not provide a standalone .exe or AppImage labeled explicitly as "Portable" in the traditional sense (like those found on PortableApps.com).
The demand for a arises from several use cases: proton mail desktop app portable
How is the data you are handling (e.g., basic privacy vs. high-security whistleblowing)?
The safest and most reliable way to use Proton Mail portably is combining the official Proton Mail web interface with a portable web browser like or Google Chrome Portable .
is a leading secure email service known for end-to-end encryption and privacy. While Proton officially offers a dedicated desktop application (currently in beta for Windows and macOS), many users specifically want a portable version —an app that runs from a USB stick or external drive without installation, leaving no traces on the host computer. However, they do not provide a standalone
Never leave your portable app on an unencrypted drive. Use VeraCrypt or Windows BitLocker To Go to encrypt the entire partition of your USB drive.
Third-party developers have created portable wrappers for Proton Mail, though these are not endorsed by Proton and should be vetted for security: ElectronMail
Install Firefox Portable directly into the mounted virtual drive (X:). The safest and most reliable way to use
Since Proton AG does not distribute an official .exe or .app designated as "portable," you must use reliable alternative methods to achieve this functionality.
Have you successfully run Proton Mail portably? Let the community know your method, but always prioritize encryption over convenience.