Proton Mail - Encrypted Email 4+

Fast, private & secure mail

Proton AG

    • Free
    • Offers In-App Purchases



Keep your conversations private. Proton Mail is encrypted email from Switzerland. Used by millions worldwide, our all-new email app protects your communications and has everything you need to easily manage your inbox.

The Wall Street Journal says:
“Proton Mail offers encrypted email, which makes it virtually impossible for anyone to read it except the sender and the recipient.”

With the all-new Proton Mail app, you can:
• Create a or email address
• Send and receive encrypted emails and attachments with ease
• Switch between multiple Proton Mail accounts
• Easily manage your email with conversations
• Keep your inbox tidy and clean with folders, labels and simple swipe-gestures
• Receive new email notifications
• Send Password-protected Emails to anyone
• Enjoy your inbox in dark mode

Why use Proton Mail?
• Proton Mail is free — We believe everyone deserves privacy. Upgrade to a paid plan to get more done and support our mission.
• Easy to use — Our all-new app has been redesigned to make it easier to read, organize, and write your emails.
• Your inbox is yours — We don’t spy on your communications to show you targeted ads. Your inbox, your rules.
• Rigorous encryption — Your entire inbox is secured, on all your devices. No one can read your emails but you. Proton is privacy, guaranteed by end-to-end and zero-access encryption.
• Unmatched protection — We offer strong phishing, spam, and spying/tracking protection for all your communications.

Industry Leading Security Features
Messages are stored on Proton Mail servers using end-to-end encryption at all times and are transmitted securely between Proton servers and user devices. This largely eliminates the risk of message interception.

Zero Access to Your Email Content
Proton Mail's zero access architecture means that your data is encrypted in a way that makes it inaccessible to us. Data is encrypted on the client side using an encryption key that Proton does not have access to. This means we don't have the technical ability to decrypt your messages.

Open-Source Cryptography
Proton Mail's open-source software has been thoroughly vetted by security experts from around the world to ensure the highest levels of protection. Proton Mail only uses secure implementations of AES, RSA, along with OpenPGP, while all of the cryptographic libraries used are open source. By using open-source libraries, Proton Mail can guarantee that the encryption algorithms used do not have clandestinely built-in back doors.

Proton Mail in the press:
“Proton Mail is a Gmail-like email system which uses end-to-end encryption, making it impossible for outside parties to monitor.” Forbes

“A new email service being developed by a group who met at MIT and CERN promises to bring secure, encrypted email to the masses and keep sensitive information away from prying eyes.” Huffington Post

Follow Proton on social media for all the latest news and offers:
Facebook: /ProtonMail
Twitter: @ProtonMail
Reddit: /ProtonMail
Instagram: /ProtonMail

For more information, visit:
Our open-source code base:

What’s New

Version 4.0.0

Introducing Proton's refreshed look.
As we continue to make privacy accessible to everyone, we've updated our apps to provide you with an even better experience with our services.
Proton - Privacy by default

Ratings and Reviews

4.1 out of 5
3.1K Ratings

3.1K Ratings

Against Goggle ,

Excellent Service Great For Privacy!

I am a ProtonPlus paid user, I started with a free account but I actually paid 2 years in advance I like it so much. I really am not cool with advertisers having the ability to read my emails which often contain much personal info. The ONLY reason I am giving 4 stars instead of 5 (which is not really protons fault) is because there are some companies that will either not accept your email address from proton or some online stores that will cancel your order when you give them as your email. It has only happened a couple times so far. I’m pretty sure the reason they don’t accept is because they are assuming your are some kind of criminal or scammer because you have a private email. When in actuality it’s because people are starting to realize what are huge problem we are facing with these tech companies knowing every detail of our life and mind. Anyways I’m hoping as more people start to use Proton, the stigma will be erased. Also if you notify proton of this they contact the company that is denying your email. Other than that it’s great! Some great features for filtering your emails into different folders too

Developer Response ,

Thank you very much for your feedback! Please note that the vast majority of online services, including all major websites, allow you to use your ProtonMail email address when registering your account. Some, however, don’t, which is why we provide you with guidelines on what to do in such situations:

Murdock85 ,

Proton Fail

I’ve been using the app off and on since August 2021, but not as my primary. Then one day out of the blue it logged me out and said “Your session has expired because you have been inactive for awhile or because it has been revoked”. Great. I tried my password, but it no longer works, I guess they erased it with their recent update and or reset it? I do not have MFA or another security email associated with it. When I reached out to them for help they asked me many questions and I answered to the best of my ability. One of which was what was in my sent folder, I told them and another was what time I last logged into the app. Very odd questions, I have no clue the last time I logged into the app, I would not have the precise time and further more I don’t logon into it, I just touch the app! They refused to help me. They stated, “We regret to inform you that the answers you provided were insufficient to validate your account ownership”. I get it, it’s a security thing and in some ways my fault for not setting up more security measures, but I’ve given them a lot of details, what’s in my inbox, deleted and sent folder, also when I downloaded the app for the first time. Still nothing, with no way to help me. Now I have to change my email on a lot of my accounts yet again which you can see in my email box that they asked about. One of which, Dominos I won’t be able to, goodbye to my points for a free pizza and good bye Proton unless you can assist a hungry man out.

Developer Response ,

We are sincerely sorry for the inconvenience this might have caused you. Please note that we have certain security procedures when it comes to account recovery. We need precise answers to the security questions so we can confirm the ownership of the account. Please try to provide the correct answers in the support request so we can help you regain access to your account.

Milzc ,

Can’t send important emails/inconsistent

I’ve been using Prtnmail for a while, and it has recently been brought to my attention that I haven’t been able to send emails to specific secure emails, namely to my Credit Union Financial Operations (finops) and to the Claims Adjuster of my insurance company. Additionally, I can’t use my ProtonMail email address as my primary email address for my bank account, as they don’t allow anonymous email addresses to be used by their customers.

Is/are there ways to get around my issues I’m experiencing? These are important emails, and I wasn’t aware that they didn’t go through until I had contacted the aforementioned companies to follow-up with my emails. Had I not contacted my Credit Union, I would not have known that my email message didn’t get received by the finops department of my Credit Union. On the other hand, I did receive an email alert immediately after attempting to send my message to the Claims Adjuster stating that my message failed to deliver.

Can somebody at ProtonMail lend me assistance or explain the reason(s) as to why my messages aren’t going through? How can I resolve this issue? This is a deal-breaker for me, and I’ll need to find a secure email server that I can use for more consistency/reliability. It makes me wonder whether or not other important email messages I had “sent” were actually sent to the recipient(s).

Developer Response ,

Thank you for reporting this issue to us. To help you we need more information. We suggest contacting us via with the following information:

- the list of entities that have rejected, or have not received emails you have sent from your Proton address, with dates and times of those emails, if possible.
- the reason/error message provided, indicating that the mail was rejected, if you have received any
- non-delivery notice emails, in case you received any (please attach email headers)
- replies from the entities' support teams, in case you have contacted any, and heard back from them (screenshots of their replies would be best)

If you would allow us to mention your name in our communication with the entities in question, we would also need the name under which you communicate to the said entities, and the Proton e-mail address you use to communicate with them.

Thank you very much in advance.

App Privacy

The developer, Proton AG, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Linked to You

The following data may be collected but it is not linked to your identity:

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