Polygnotos VerifySign in

Verify a drawing

Check that a PDF is exactly a drawing we issued, and who signed it. Have a printed sheet instead? Scan the QR code in its bottom-right corner with your phone's camera.

Drop the PDF here

Your file never leaves this browser. We work out its fingerprint (SHA-256), a short code that changes if even one byte of the file changes, and look up only that.