Verify a signed PDF

Check whether a PDF was completed on signround and is unchanged since. The file never leaves your browser: its SHA-256 is computed locally and only that hash is sent for the lookup. Nothing is stored.

Choose the signed PDFUp to 25 MB. The file stays in your browser; only its SHA-256 is sent.

Every completed PDF carries a signround certificate signature (PAdES, ETSI.CAdES.detached) as tamper protection and an audit-trail page listing the certificate fingerprint. PDF readers such as Adobe Acrobat show the signature panel; any edit after completion breaks the certificate signature. Without a login, this page shows only match or no match, the completion date and the status of the certificate signature.