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An illustration demonstrating Proton Mail's end-to-end encryption and zero-access encryption.

An illustration demonstrating Proton Mail's end-to-end encryption and zero-access encryption.

Strong encryption at all times
Open source and transparent
Unique defenses against attacks
Better security through privacy
Built by and for our community

A screenshot of a Proton Mail email showing our end-to-end encryption and enhanced tracking protection.

Proton Mail is protected by multiple layers of security and trusted by journalists, security experts, and millions of people around the world.

Strong encryption at all times

Proton believes your data belongs to you. That’s why we use end-to-end encryption and zero-access encryption to ensure that only you can read your emails. We cannot read or give anyone else access to your emails. And this encryption happens automatically — no special software or tech skills required.

End-to-end encryption

With Proton Mail, emails are encrypted at all times, so we can never access your messages. The content of your emails is encrypted on your device before being sent to our servers, meaning only you and your intended recipient can decrypt it.

You can also use our Password-protected Emails feature to quickly send end-to-end encrypted emails to any email address, not just Proton Mail accounts.

The Proton Mail app uses end-to-end encryption.

Encrypted contacts

Proton Contacts uses zero-access encryption and digital signatures to ensure no one can tamper with your contacts or see any details you add, including your contact's phone number or address.

This lets you add and organize all your contacts' details in one convenient location while knowing that no one, not even Proton, can access that information but you.

Password-protected Emails

The easiest way to send end-to-end encrypted emails is if both the sender and recipient use Proton Mail. However, you can use our Password-protected Emails feature to send secure emails to people who don’t use Proton Mail.

Simply select a password in the composer before you click send, and your email will be inaccessible to both Proton and your recipient’s email provider.

Self-destructing messages

Emails no longer need to be permanent. You can set an optional expiration time on Proton Mail’s encrypted emails after which they will automatically delete themselves from your recipient’s inbox.

This technology works for emails sent to other Proton Mail accounts and Password-protected Emails sent to non-Proton Mail email addresses.

Enhanced tracking protection

Your emails belong to you, which is why Proton Mail lets you read them without letting advertisers watch you, build a profile on you, or serve you ads based on your mail activity. Our web app automatically blocks tracking pixels and hides your IP address, so you can read your emails without exposing any personal information.

Zero-access encryption

Proton Mail’s zero-access architecture means we can never access your emails. Emails from other service providers are instantly encrypted on our servers using your public key, meaning we do not have the technical ability to decrypt your messages.

As a result, we cannot hand your emails over to anyone.

PCMag

CNET

PCMag

Open source and independently audited for transparency

Founded by scientists, we believe transparency and peer review lead to better security for our community. All our apps are open source so that anyone can use and improve them. They have also been audited so that anyone can trust them.

Open source

Every app you use to access your Proton Mail inbox is available for inspection. Open sourcing our code increases the security of our apps because it allows us to leverage the global security community to search for vulnerabilities.

Audited

All Proton Mail code has been independently audited by third-party security experts. The results of those audits are publicly available on our website.

View audit report

Hardware-level security

We have invested heavily in owning and controlling our own server hardware at several locations within Switzerland, so your data never goes to the cloud. Our data centers are located at highly secure sites that require biometric access. This provides an extra layer of protection by ensuring your encrypted emails are not easily accessible to third parties. On a system level, our servers utilize fully encrypted hard disks with multiple password layers, preserving data security even if our hardware is seized.

Built-in PGP support

Proton Mail users are more secure when they can use end-to-end encryption to communicate with everyone, not just other Proton Mail users. This is why we offer PGP support, which automatically encrypts messages using the public key of your recipient. In fact, you can use Proton Mail to replace your existing PGP client.

Address verification and key pinning

Proton Mail provides a seamless email experience in part because we manage encryption keys behind the scenes. Address verification and key pinning perform independent client-side verification of encryption keys. This optional control over key management protects against man-in-the-middle attacks and makes it so that you don’t have to blindly trust us.

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Unique defenses against attacks

People are the weakest link in any security system, which is why we have added several layers of defense against social engineering attacks and human error. Best of all, these features don’t require any extra steps. Your inbox is secured by default.

Better security through privacy

Better privacy often leads to better security. Proton Mail offers both, empowering you with policies and tools to take control of what information about you is available online.

Based in Switzerland

Proton Mail is based in Switzerland, which means all user data is protected by some of the world’s strictest privacy laws.

Switzerland is politically neutral and is not a party to any foreign intelligence-sharing surveillance networks. Due to the encryption we use, we do not have access to your inbox, and we only respond to official requests from Swiss authorities, which are subject to strong Swiss privacy laws.

Proton is based in Geneva, Switzerland, home to strong data privacy laws.

Onion address

Proton Mail offers encrypted email over Tor through our onion site.

Connecting to Proton Mail over Tor helps prevent anyone monitoring your network from knowing you are using Proton Mail and provides access to your encrypted email account even if Proton Mail is blocked by your government.

Alternative routing

Sometimes governments attempt to force their citizens to use less secure forms of communication by blocking access to encrypted services.

Alternative routing is another of our anti-censorship features that help ensure you can always access your email. If your connection is being blocked, Proton Mail apps will automatically seek alternative paths to establish a connection with our servers.

Built by and for our community

Thanks to our user-focused business model, Proton is able to work collaboratively to build products that put privacy and security first. This is reflected in the many ways we participate in the security community.

OpenPGP.js

We are the maintainers of the world’s most widely used open-source OpenPGP library in JavaScript.

GopenPGP

We developed and maintain an easy-to-use wrapper library written in Go as well as a fork of the original golang crypto library.

Bug bounty

Because our code is open source, the Proton community benefits from security researchers around the world who participate in our bug bounty program.

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