Send encrypted email and files. No keys, no setup.
Traditional email encryption makes everyone swap keys before the first message, and most people never manage it. PostGuard encrypts to a person's identity instead: send right away, and your recipient proves who they are with the Yivi app to open it.
How it works
- 1
Add your files
Drag in the files you want to share. Up to 5 GB, encrypted right in your browser.
- 2
Set the recipient's identity
Just their email address, no keys to exchange. Optionally add their date of birth or phone number.
- 3
Sign with your own identity
Confirm with the Yivi app, and your files are on their way.
Send large files. Without limits that get in the way.
Most encrypted file-sharing services cap free transfers at just a few hundred megabytes. PostGuard lets you share much more, completely free.
Send a single file or a whole batch, up to 5 GB in one encrypted transfer.
Up to 5 GB of encrypted file sharing per email address, over a rolling 14-day window.
No account. No payment. End-to-end encrypted, always.
Why PostGuard?
Encrypted email isn't new. But PGP and S/MIME are so hard to use that, in one study, only 1 in 10 pairs of people managed to exchange a single encrypted message. PostGuard was built so encryption is something anyone can actually use.
No keys to manage
No generating, exchanging or safeguarding public and private keys. PostGuard encrypts to your recipient's identity, and they just prove who they are with the Yivi app.
Nothing to set up first
You don't need anything from your recipient in advance. Send now; they verify their identity afterwards to read it, with no accounts or installs beforehand.
Free, open source & end-to-end
Files are encrypted in your browser, so only the intended recipient can open them. Free and open source, developed at Radboud University.