Security and privacy

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The Proton Sentinel program protects your account and lets you monitor login attempts with detailed logs. We explain how to use it.

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Learn more about Proton Mail’s Infrastructure and Threat Model

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How to use the hash values of we publish to ensure APK files your download from Proton can be trusted

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We explain what anonymous usage statistics you share with Proton and how they help us improve our service. We also explain how to opt out.

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4. Mobile security

Set your Proton Mail Android app to automatically lock with a pin code

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4. Mobile security

Learn how to set Proton Mail on your iPhone to lock automatically with Face ID, Touch ID, or PIN code lock.

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4. Mobile security

Proton apps on Android use the Android Keystore system to encrypt your passphrase, but on less than 1% of devices there is an issue.

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4. Mobile security

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4. Encryption and keys

Proton Mail allows you to choose which kind of encryption keys to use for your accounts. Learn how to change your encryption keys.

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4. Encryption and keys

Key Transparency is an advanced blockchain-based security feature that lets you verify the integrity and authenticity of your Proton Mail contacts.

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4. Encryption and keys

You can use import your existing OpenPGP private key into Proton Mail and continue using it to encrypt and decrypt your emails.

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4. Encryption and keys

Learn how to download your encryption keys from Proton Mail to send PGP-encrypted emails to non-Proton Mail users or use another PGP client.

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4. Encryption and keys

Key import allows you to add existing PGP keys to one of your Proton Mail addresses or restore backed-up keys if you lose your password.

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4. Encryption and keys

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4. Encryption and keys

To keep your messages safe, Proton Mail will not allow you to import weak keys or keys that have not been standardized for use with OpenPGP.

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4. Encryption and keys

Proton Mail private key is stored encrypted on your browser using your mailbox password. Learn more about your private key.

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4. Browsers and cookies

JavaScript must be enabled in your browser for Proton Mail to work correctly,. In this article, we show you how to enable JavaScript in all major browsers.

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4. Browsers and cookies

Proton Mail has been fully tested and works well with most modern browsers. But we only recommend browsers that also respect your privacy.

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4. Browsers and cookies

Proton Mail requires a browser that supports the Web Cryptography API in order to secure your data. We explain what Web Crypto is.

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4. Browsers and cookies

Learn how to turn Private Browsing on and off in iOS Safari. Private Browsing can block cookies that are needed to implement Proton Mail's encryption.

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4. Browsers and cookies

Proton Mail provides email access over the Tor network through our onion site at https://protonirockerxow.onion. If you are connected to Tor and using Firefox, there is another step you may have to follow to be able to access onion sites.

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4. Browsers and cookies

Proton Mail uses Let's Encrypt as its certificate authority. This article describes the steps to verify our certificate for various browsers.

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4. Browsers and cookies

Both the browser cache and cookies can cause minor issues when using Proton Mail. In this article, we show you how to clean them in all major browsers.

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4. Browsers and cookies

Proton services use the time on your device to verify that keys and signatures are still valid. This helps ensure your files stay secure.

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4. Browsers and cookies

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4. Browsers and cookies

Learn how to use Private Browsing (also known as Incognito) mode in your browser to access Proton Mail more privately.

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4. Browsers and cookies

Allowing session storage on most used browsers Chrome, Firefox, Safari, IE

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4. Browsers and cookies

Troubleshooting errors using Proton Mail in iOS browsers (Safari, etc)

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4. Browsers and cookies

Proton Mail generates random numbers in several places to secure your account. Learn why you need PRNG to use Proton Mail.

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4. Browsers and cookies

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4. Browsers and cookies

Proton Mail and Proton VPN require JavaScript, sessionStorage, and cookies to ensure the security and privacy of your data.

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4. Browsers and cookies

One of the requirements for using Proton Mail on some browser is enabling cookies. Learn how to enable cookies for easy usage of Proton Mail