ProtonMail Themes

We’ve added built in themes so you can customize your ProtonMail experience with themes made by our team and our world-wide community.  The other exciting news is that we are now approaching the ProtonMail 2.0 release which will contain some major enhancements. We are also happy to report that our iOS app has now been submitted for App Store approval!


ProtonMail Themes

To find our new themes, go to the Settings page and then click on the Themes tab.

Screen Shot 2015-07-13 at 6.15.18 PM

ProtonMail currently supports 4 themes, including a dark green theme from ProtonMail user _csalmeida.

Screen Shot 2015-07-13 at 6.15.30 PM

Anyone can submit a theme if you know CSS at our official Theme Tumblr page here:

Note that themes are still an experimental feature and only the default theme is supported 100%. Custom themes might not work on all browser and all operating systems and platforms (like mobile and tablet).

Stay tuned for more updates!

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Inbox Design Poll

  • Even though ProtonMail 2.0 has not yet launched, we are already looking towards version 3.0. As part of our 3.0 redesign, we are considering two major styles.

    The following diagrams are for illustration purposes only. Design and aesthetic details such as colors, icons, button locations, etc should be ignored. Our focus is on the layout.

    Earlier polls sent out to ProtonMail Lifetime, and then Visionary supporters were both inconclusive so we are now polling our entire user community. Let us know what you prefer!

  • This style shows the sidebar menu, message list, and also message content all in one view. Apple Mail, Outlook, are some examples which use this style.
  • This is the existing ProtonMail style with most of the space used for the message list. Yahoo Mail, and Gmail are examples which use this style.


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ProtonMail Open Source Cryptography

Over the past year, we’ve had a number of people ask us about our approach to Open Source software. The reality is that the most critical parts of ProtonMail have actually been open source from day one. This is not something that we have made a special effort to point out, and as a result it is not widely known.

ProtonMail’s front end encryption is completely open source and uses the OpenPGPjs library. All of the source code can be downloaded and viewed here:

In addition to using the OpenPGPjs library, our developers have also audited the library and we regularly contribute our fixes and improvements. In the past few months, we have also made extensive overhauls to the library in order to resolve a couple of major performance bottlenecks and when these changes are completed, we will be making a major OpenPGPjs release which we will detail in a future blog post.

ProtonMail’s approach to open source revolves around two core philosophies.

1.  Standards Compliant

We believe in compatibility and interoperability. Thus, ProtonMail’s encryption complies fully with the OpenPGP standard. This brings a number of benefits. Because we are using an open standard, you as the user can know exactly how we are applying end-to-end encryption to secure your emails. In the future, we will be adding to ProtonMail the ability to import and export PGP keys. By complying with OpenPGP, it will be possible to do things like, download ProtonMail messages and decrypt them locally using your own PGP software.

2.  Peer Review

As former scientists from CERN, MIT, and elsewhere, we are firm believers in the peer review process. Open source without peer review is just not sufficient. Because of this, we are committed to helping foster and maintain a strong community around OpenPGPjs. Today, OpenPGPjs has become the most well known Javascript PGP library with by far the largest user community. This translates to many developers from around the world reviewing and auditing the code with us to ensure that it is free of security flaws. Simply put, no other JS PGP library has undergone the same level of peer review.

The Future

We are committed to keeping ProtonMail’s cryptography open source for the long run. As time goes by, we will be continuing to open source more and more software packages as they mature. Recently, we completed the first native OpenPGP libraries for both iOS and Android which will be launched in our upcoming encrypted email mobile apps. These native libraries will allow for unparalleled performance and the best possible user experience for secure email on mobile. We look forward to continuing to support open source on mobile and beyond.

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Summary of HSTS Support in Modern Browsers

This a guest blog post by Mazin Ahmed, an external security expert who has helped test and audit ProtonMail. We hope it will educate our readers about web security.

HTTP Strict Transport Security (HSTS) is a web security policy that is made to protect secure HTTPS websites against downgrade attacks that is used to perform Man in the middle attacks. “Once a supported browser receives this header that browser will prevent any communications from being sent over HTTP to the specified domain and will instead send all communications over HTTPS. It also prevents HTTPS click through prompts on browsers”[1]. (more…)

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ProtonMail at Swissnex San Francisco

Earlier this week, we were invited to speak about our free encrypted email service at Swissnex San Francisco’s “Ensuring Safety for the Future of Cyberspace” event.  As some of you may know, Swissnex is a part of Swiss embassies and consulates worldwide and has the mission of connecting Swiss technology and innovation with local communities.  At the event, one of our team members, Bart Butler, explained why and how we utilize end-to-end encryption to provide email privacy to ProtonMail users. (more…)

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We’re upgrading all ProtonMail accounts to 1GB of storage!

Click Here to get a Free Account

One year ago, we launched ProtonMail Beta to bring easy to use private email to the world. We never imagined that our project would gather so much support from all around the world. Thanks to you, ProtonMail has grown incredibly in the past year. To celebrate our first anniversary and to thank all of our early supporters, we are making a big change to our free encrypted email service.

We’re excited to announce that we are upgrading all existing ProtonMail accounts to 1GB of storage within the next couple days, up from the current limit of 500MB.

Furthermore, any ProtonMail accounts requested by June 17, 2015 will have 1GB of storage when activated. If you have not signed up for a free email account, you can get one here.


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ProtonMail BETA v1.16 Release Notes

ProtonMail BETA v1.16 is finally here! We’ve added encrypted attachments so you can send and receive attachments from ProtonMail users in a fully end-to-end encrypted way. We are also excited to showcase one of the most widely requested features for productivity: archive folder and custom “folders”. You will also notice a fresh look on our homepage and UX improvements on your inbox throughout. Finally, we’ve added a number of new settings including a way to customize ProtonMail’s theme if you know CSS. As usual, if you encounter any problems, please clear your browser cache or log out and log back in. Here’s a quick introduction to the new features:


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