Proton Mail Desktop App Portable ((full))

It carries everything it needs to run without touching the host system. 3. The Windows Workaround

: Launch your browser from your portable drive (e.g., Brave Portable or Chrome Portable ). Log In : Navigate to mail.proton.me and sign in. Create Shortcut : Click the three-dot menu (top right). Select Save and Share → Create Shortcut . Check the box Open as window and name it "Proton Mail".

| Method | Portability | Ease of Use | Security | Official Support | |--------|-------------|-------------|----------|------------------| | Portable browser + web app | ✅ Full | ✅ Easy | ✅ High (if using private mode) | ✅ Yes | | Bridge + portable Thunderbird | ⚠️ Partial | ❌ Complex | ✅ High | ✅ Yes | | Unofficial repack | ⚠️ Risky | ⚠️ Medium | ❌ Unknown | ❌ No |

| Method | Portability | Security | Effort | |--------|-------------|----------|--------| | | ✅ Excellent | ✅ High (with master password) | Low | | Hacked desktop app on USB | ❌ Unreliable | ⚠️ Medium (risk of leaks) | High | | Official desktop app (installed) | ❌ Not portable | ✅ Very high | Zero |

For years, the community has filled the gap with unofficial projects. These are often built using the Electron framework to wrap the web interface into a standalone executable.