Where Does Proton Bridge Store Data?
Proton Bridge local data folders on Windows, macOS and Linux; mail itself stays on Proton servers.
Last updated
Proton Bridge translates ProtonMail for IMAP clients, caching mail locally under a protonmail folder. Accounts and bridge settings share the tree.
Cache is disposable; credentials are not. Re-authenticate on new machines and let the cache rebuild from the server.
Where Proton Mail Bridge stores this, by platform
%APPDATA%\protonmail\bridge
Holds bridge data and cache. Exact inner layout shifts between Bridge versions; copy with Bridge stopped. Re-authenticate after migration.
~/Library/Application Support/protonmail/bridge
Same role. Use Go to Folder in Finder.
Frequently asked questions
Where are my emails stored?
They stay on Proton servers. Bridge caches locally for IMAP clients; the cache rebuilds on reinstall. Export via your mail client for offline archives.
Notice an outdated path? Let us know.