When using this method, you must manually redirect the application's data directory ( --user-data-dir ) to a relative path on your USB drive. Failure to do so will cause the virtualized app to write your encrypted local cache back onto the host computer's AppData folder. 3. Progressive Web App (PWA) via Chromium Portable
Proton Technologies currently offers two official desktop solutions:
In the modern era of digital privacy, stands as a titan. Known for its end-to-end encryption, Swiss privacy laws, and zero-access architecture, it has become the go-to email service for journalists, activists, and privacy-conscious professionals. proton mail desktop app portable
Faster than a web browser, with better handling of large inboxes.
Proton Mail has dedicated desktop applications for Windows, macOS, and Linux (Linux version is currently in beta). This app provides the full Proton Mail and Calendar experience. However, it requires a standard installation on your computer. It is not designed to be run from a USB drive. The app is available for paid Proton plans, with a 14-day free trial for free accounts. When using this method, you must manually redirect
If you need a true offline client that lives entirely on a USB drive, you must use a bridge. Note that this requires a .
The short answer is However, for power users who need a truly portable setup (running from a USB drive without installation), there are effective workarounds. This article breaks down the official options, the portable reality, and the safest way to achieve a "take-it-anywhere" Proton Mail client. Progressive Web App (PWA) via Chromium Portable Proton
Full access is reserved for paid subscribers; free users get a limited trial. as a portable alternative? How to get started with the Proton Mail desktop app
As of early 2024, Proton does not offer an official "portable" .exe or .app file. However, because the community and the demand for privacy are so strong, there are several reliable ways to achieve a portable Proton Mail setup.