Protect your privacy with zero-access encryption

Your emails, calendar, photos, and files are your business. Proton’s zero-access encryption means no one but you can access them. Not even Proton.

What is zero-access encryption?

Zero-access encryption protects your data “at rest” when it’s stored in the cloud. With zero-access encryption, your data can’t be shared with third parties or leaked in the event of a data breach.

The key to your secure cloud

Encryption scrambles data (like your emails, photos, and files) into unreadable text to keep it private. Only those with the right encryption key can read it.

With Proton’s zero-access encryption, you control the key to your private, personal information. Only you can access it. Only you can share it.

Protect your privacy with zero-access encryption

Encrypted emails

With Proton Mail encrypted email, zero-access encryption keeps all your stored emails private on our servers. Send secure messages to anyone using end-to-end encryption and Password-protected Emails.

Encrypted files

Proton Drive secure cloud storage encrypts your files on your device before sending them to the cloud, so no one else can access them, not even Proton. But you can share files of any size with anyone using secure, shareable links.

Encrypted contacts

With Proton Contacts, your contacts’ personal details, like phone number and address, are automatically encrypted. Only you have access to them. All your contacts are digitally signed to verify they haven’t been tampered with.

Encrypted attachments

Proton Mail automatically encrypts and decrypts all your email attachments on your device just as it encrypts your emails. View your encrypted email attachments in the Proton Mail app without downloading anything to your device.

Encrypted events

With Proton Calendar, your events and contacts are encrypted, so no one but you can see your schedule. Invite someone to an event, and no one can know their identity. Calendar invites are digitally signed so those you invite can be sure they’re from you.


Millions of people worldwide trust Proton’s encryption to stay private

Get encrypted email, calendar, cloud storage, and a VPN.


Secure your email with an encrypted service that is private by default.


Your calendar is a record of your life. Keep it private and encrypted.


Secure your files with encrypted cloud storage that gives you control of your data.


Your gateway to online freedom. Access blocked content and browse privately.

Protect your privacy

No one but you can access your emails, photos, and files. Not even Proton.

Access anywhere

All your data is encrypted automatically with easy-to-use apps for all your devices.

Share securely

Share files of any kind and any size with anyone with secure, shareable links.

No ads

Proton offers tracking protection from advertisers and will never show you ads

Beat data breaches

Your data remains secure in the event of a data breach — hackers see only undecipherable ciphertext.

Swiss privacy

We’re based in Switzerland, so your data is protected by some of the world’s strongest privacy laws.

Open-source security

All our apps are open source and independently audited, so security experts check they’re secure.

Stay compliant

Proton’s encryption complies with strict local privacy regulations, like GDPR and HIPAA.

Your privacy is our first and only priority

The only people we’re obligated to are you. We are the privacy company, pure and simple.

Join the 70 million people and businesses that have entrusted Proton to keep their data private.


You get what you pay for. In the case of big tech, if you pay nothing, you get used. I quit using Gmail and switched to @ProtonMail

Jack Dorsey
Twitter co-founder

My favorite email service

Mark Ruffalo
American actor and producer

I love my ProtonMail


Thanks Proton for keeping us all safe in the complicated internet universe.

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Zero-access encryption FAQ