This gives you full IMAP/SMTP access portably, but Bridge itself must be installed on each PC you use—defeating full portability.
| Method | Fully Portable | Offline Access | Official Support | |--------|---------------|----------------|------------------| | Official Desktop App | ❌ | ✅ | ✅ | | Portable Browser + Web App | ✅ | ❌ | ✅ | | Hacky portable .exe | ⚠️ Unreliable | ✅ | ❌ | | Bridge + Portable Thunderbird | ❌ (needs Bridge install) | ✅ | ✅ | proton mail desktop app portable
If you want the experience, you’ll have to stick to the standard installer for now. However, for a truly portable Proton Mail desktop app , the best move is to use ElectronMail or a dedicated Portable Browser setup. Both methods give you the "app feel" while keeping your data strictly on your own hardware. This gives you full IMAP/SMTP access portably, but
for Proton Mail. It is often available in portable formats (like or AppImage) on SourceForge and GitHub. Progressive Web App (PWA) Shortcut Both methods give you the "app feel" while