Proton Mail

Web Client
Web Client
Written in	TypeScript and Go
License	GNU GPLv3
Website	mail.proton.me; mail.protonmailrmez3lotccipshtkleegetolb73fuirgj7r4o4vfu7ozyd.onion ;
Repository	github.com/ProtonMail

Proton Mail
	Screenshot of the Proton Mail website, showing the conversation view of a message in a user's inbox
Available in	List English, ; Catalan, ; Chinese, ; Dutch, ; French, ; German, ; Hungarian, ; Italian, ; Japanese, ; Polish, ; Romanian, ; Russian, ; Spanish, ; Turkish, ; Portuguese, ; Ukrainian ;
Headquarters	Plan-les-Ouates, Switzerland
Owner	Proton AG
Website	proton.me/mail; protonmailrmez3lotccipshtkleegetolb73fuirgj7r4o4vfu7ozyd.onion/mail ;
Commercial	No
Registration	Required
Users	100 million (April 2023)
Launched	16 May 2014
Current status	Online

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Proton Mail is an end-to-end encrypted email hosting service. It was launched in 2014 by Andy Yen, Jason Stockman and Wei Sun. Proton Mail is headquartered in Geneva, Switzerland. It is owned by the non-profit Proton Foundation through its subsidiary Proton AG, which also operates Proton VPN, Proton Drive, Proton Calendar, Proton Pass, Proton Wallet, Proton Meet, and Lumo AI. Proton Mail uses client-side encryption to protect email content and user data before they are sent to company servers, unlike other common email providers such as Gmail and Outlook.com.

Proton Mail received its initial funding through a crowdfunding campaign, and initial access was by invitation only, but it opened to the public in 2016. There were two million users by 2017, almost 70 million by 2022, and 100 million users in 2024.

The source code for the back end of Proton Mail remains closed-source, but Proton Mail released the source code for the web interface, iOS and Android apps, and the Proton Mail Bridge app under an open-source licence.