Proton was started in 2014 by scientists who met at CERN and shared a vision of an internet that defends freedom and puts people first. Our transparency, open-source software, and rigorous …

Download Proton Mail, Proton Calendar, Proton VPN, and Proton Drive for your device (Android, iOS, Windows, macOS, or Linux).

Sign in to your Proton Account to access all encrypted Proton services such as Proton Mail, Drive, Calendar, and more. Don't have an account? Create one for FREE.

Proton Mail is the world’s largest secure email service with over 100 million users. Available on Web, iOS, Android, and desktop. Protected by Swiss privacy law.

Proton Mail is based in Switzerland and uses advanced encryption to keep your data safe. Apps available for Android, iOS, and desktop devices.

New to Proton? Create account. Trouble signing in? Proton. Privacy by default.

We launched Proton in the summer of 2014 after a successful public crowdfunding campaign in which over 10,000 individuals donated over $500,000 to bring our shared vision to life.

Get the Proton Mail app to send encrypted email and keep your communications private by default.

We believe privacy should be accessible to everyone, which means you can create a free Proton account and enjoy the essential features of Proton Mail, Proton Calendar, Proton Drive, and …

A proton is a stable subatomic particle, symbol p, H +, or 1 H + with a positive electric charge of +1 e (elementary charge). Its mass is slightly less than the mass of a neutron and …