Encrypted in this browser before it is sent. We store what comes out and cannot read it.
Longer windows are part of a subscription. See plans.
0 means it can be opened as often as you like, until it expires.
At least 6 characters. Send it by some other route than the link — a passphrase in the same message protects nothing.

How this works

Your secret is encrypted in this browser. The key that opens it becomes part of the link, after the # — and browsers never send that part to a server. We hold the encrypted bytes and nothing that can turn them back into text.

So send the whole link, keep it out of anywhere public, and know that if you lose it we cannot get the secret back for you. That is the point of it.

A passphrase adds a second gate: we check it before handing the encrypted bytes over, and after a few wrong tries the secret is destroyed.