Seal
it in a
jar.

Amphra encrypts a file in your browser before it goes anywhere. The key travels inside the link you send, and the jar breaks after one opening.

Seal a file here Ask for early access

In development. Letting people in by email.

For a thousand years, the jar was the network.

Amphorae carried wine and oil across the Mediterranean, stoppered and sealed at the mouth, so nothing leaked out and nothing slipped in on the way. Whoever broke the seal was the one who was meant to.

Amphra is the same idea for files you'd rather not leave lying around in someone's inbox: contracts, IDs, keys, exports.

α
Sealed before it leavesFiles are encrypted with AES-256 on your device. What reaches us is noise.
β
The key rides in the linkIt lives after the #, the part of a URL browsers never send to a server.
γ
One openingWhen the recipient opens the jar, the stored copy is deleted. Unopened jars expire.
δ
No account to receiveThe person you send it to only needs the link.

How a jar is sealed

Three steps, painted in order — the way they'd run around a pot.

Fill

Drop in a file. It's encrypted right there in your browser with a fresh key.

Seal

You get a link with the key folded into it. Send it any way you like.

Break

The recipient opens it once. Then the jar is broken and the stored copy is gone.

Seal a file. Right here.

This runs entirely in this tab with your browser's built-in Web Crypto. Nothing is uploaded — close the tab and it's gone.

Choose a file or drop it here Any type, up to 100 MB

The jar is empty.

Amphra the service is still being built. This demo shows the part that matters most: the encryption happens on your side.

Three things it will never do

See inside your jar

Only ciphertext is stored. Without the link, the contents can't be read — by anyone, including us.

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Keep it around

A jar is deleted when it's opened, or when it expires unopened. There is no archive.

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Make recipients sign up

Receiving a file takes a link and a browser. Nothing to install, no account.

Questions

Can I use it today?

Not yet. Amphra is in development and we're letting people in by email as it gets ready.

What if I lose the link?

The key exists only in the link. Lose it and nobody can open the jar — that's the point.

How big can a jar be?

The demo on this page handles up to 100 MB. Limits for the service will be announced at launch.

Ask for a jar.

Tell us what you'd send with it. Early access goes out in small batches.

hello@amphra.xyz

Seal it in a jar.