No signature company to trust. Forward the document, type "I sign this document", and your email provider's DKIM signature, the one that already authenticates your mail, signs it. The proof is one self-contained file anyone can verify offline in a browser: no account, no app, it holds up even if we disappear. We never hold a key, so we can't forge or alter anything. Open source, Apache-2.0: self-host, or use the hosted version. Start with 4 free, then $0.25 a document, no subscription.

Hi PH, Barry here, from Kychee, the team behind kysigned. We kept overpaying to sign the occasional document and wanted to understand why. It comes down to trust: a signature is only worth something if it holds up later, and the big names charge a premium for the confidence they've spent years building. The trust is the moat, and the moat is the price. So instead of trying to out-trust anyone, we moved the trust to something the whole world already relies on: email. To sign, you forward the document and type "I sign this document" as the first line. Your email provider's DKIM signature, the same one that already proves your mail came from you, signs the document and your intent. We gather that proof and package it into one self-contained PDF anyone can verify themselves, offline, even if kysigned disappears. We never hold a key, so we couldn't forge or alter a signature even if we wanted to. One honest limit, true of every e-sign tool: it proves the mailbox signed, not that the human behind it is who they claim. Identity-binding is a separate layer. It's live at kysigned.com: the first 4 are free, then $0.25 a document, no subscription. It's also open source, so you can fork and self-host if you'd rather. Would genuinely love your feedback. I'll read everything and answer your questions.

Clever idea using DKIM keys for signing, and the self-contained verification file is a really nice touch. Forwarded a test doc and the whole flow took maybe 30 seconds, no account setup at all.

@mustafa884297 Thanks Mustafa! 30 seconds with no account setup is exactly what we were going for, so a real test holding up like that made my day.

Really cool - gonna try it with my agents!

Clever idea using DKIM keys for signing, and the self-contained verification file is a really nice touch. Forwarded a test doc and the whole flow took maybe 30 seconds, no account setup at all.

@mustafa884297 Thanks Mustafa! 30 seconds with no account setup is exactly what we were going for, so a real test holding up like that made my day.

Really cool - gonna try it with my agents!

kysigned

E-sign documents by forwarding an email. $0.25.

E-sign documents by forwarding an email. $0.25.