End to end means that your computer is the only one that can read your gmail email, because the key is stored on your computer and not in the cloud. The whole

End to end means that your computer is the only one that can read your gmail email, because the key is stored on your computer and not in the cloud. The whole reason we all moved to webmail from pop3 is to have access to our mailboxes on any device. If you put the key in the cloud and make it decryptable by some user-known data (like a password), there's very little point in having the key - brute forcing a user's key becomes very simple. Also, any legitimate service provider is going to provide a backup way to "recover your password", which means they have a shortcut to decrypting your data. So you can have one or the other, not both. Either you have simple, easy access to your data from multiple devices, or you have secure end to end encryption.