Data is encrypted on the client side using an encryption key that we do not have access to. Zero Access to User Data Your encrypted data is not accessible to us ProtonMail's zero access architecture means that your data is encrypted in a way that makes it inaccessible to us. Let us know if you do something cool with our code.

As a nod to our CERN and MIT roots, we are releasing under the permissive MIT license. ProtonMail 2.0 can be viewed online on Github at the link below. As we continue to expand our private email service with mobile apps, you can look forward to more open source announcements as our code base matures. By open sourcing ProtonMail 2.0, we are open sourcing the future of ProtonMail. While it would have also been possible to open source ProtonMail 1.x, we felt that such a move was not appropriate given that the code was intended to be deprecated. Our move to open source has actually been coming for a long time. We hope that by opening up our platform, we will encourage additional contributors to help us make ProtonMail the world’s most secure email service. This means all the ProtonMail code that runs on your computer is now available for inspection. Today, we are happy to take the next step and completely open source our webmail interface. We are happy to announce that we are also releasing ProtonMail 2.0 as open source software! From the beginning, we have been strong proponents of open source software and the core cryptography libraries that we develop and use have been open source from day one.

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