Proton Mail: Encrypted Email

In-app purchases
4.3
85.4K reviews
10M+
Downloads
Content rating
Everyone
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About this app

Proton Mail's all-new encrypted 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 @proton.me or @protonmail.com email address
• Send and receive encrypted emails and attachments with ease
• Switch between multiple Proton Mail accounts
• 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 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.

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 Easy Switch
Migrate from Gmail, Outlook, Yahoo, iCloud Mail or AOL to Proton Mail in just a few taps. Your messages, calendars and contacts are transferred automatically, so you’re up‑and‑running in moments—without any manual exporting or importing.

Gmail Auto‑forwarding
Enable auto‑forwarding from any number of Gmail accounts and funnel all the emails that matter into your Proton Mail inbox. Preserve Gmail’s convenience while adding an extra layer of privacy protection.

Proton Mail in the press:

“Proton Mail is an 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 from MIT that met at 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: /proton
Twitter: @protonprivacy
Reddit: /protonmail
Instagram: /protonprivacy

For more information, visit: https://proton.me/mail
Our open-source code base: https://github.com/ProtonMail
Updated on
Mar 13, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
This app may collect these data types
Personal info, Contacts and 3 others
Data is encrypted in transit
You can request that data be deleted

Ratings and reviews

4.3
81.9K reviews
Benjamin Sims
March 19, 2026
I've been using Proton Mail for a few years, but I'm considering dropping it. This app fails to show me all of my emails. After I open them in the browser, they become visible in the app. That's very annoying. Reliably receiving emails is the main job of an email app. Update 3/19/25: After about five months, the app continues to fail to display all inbox emails.
99 people found this review helpful
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Proton AG
November 12, 2025
That doesn't sound right! Please share your app logs with us via the in-app 'Report a problem' option, so our team can look further into this. Thank you in advance!
Aster F
February 12, 2026
EDIT: by version 7.7.2, these are all fixed/implemented! Great! PREVIOUS REVIEW: The search doesn't work at all for me on 4.13.0. You also can't select all emails, or edit folders/labels on the app while you can on the mobile website. I also wish you could edit filters like on the desktop site, and swipe left and right between emails like you can with most mobile email clients.
66 people found this review helpful
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Proton AG
February 19, 2026
Thank you for your 5-star review! We're happy to hear that everything is in order.
Siri *
March 15, 2026
it's stressful. when you type an email in the phone app if you backspace it changes the font size so you have an email with two very different font sizes which is difficult to fix on a phone so you send emails looking like you're crazy what appears to be an 12-point and a 14 point Arial font there's not enough time to fix them when you're in a hurry and have a million other things to do so you just send these strange emails to friends and businesses. I asked Claude AI. Said it's a known bug.
1 person found this review helpful
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Proton AG
March 16, 2026
Hello! Can you clarify if this behavior occurs when replying to a message from your inbox? Please reach out to us via the "Report a problem" feature so we can look into this.

What’s new

We've significantly improved synchronization performance in this release. In most cases, your mailbox will now sync much faster, helping new messages, changes, and updates appear more quickly across your devices.