Verify a signed document
Drop a signed PDF or a .p7m file. If it's a document signed with DataPDFEngine, we tell you whether it is identical to the original and who signed it; the digital signatures of any European provider we check against the EU trusted lists.
For DataPDFEngine documents the file is not uploaded: your browser computes its SHA-256 fingerprint and sends us only that. To check other providers' signatures we ask you before sending it.
For this check the file is sent to our servers, used only for the check and not kept. This check is for information only and is not a qualified validation service under Regulation (EU) 910/2014.
What this check covers
Integrity
We compare the SHA-256 fingerprint of the file with the one recorded when the document was completed. A single different byte changes the fingerprint.
Signatures
Each signature is a simple electronic signature (SES, art. 3 of the eIDAS regulation) with its record: date, method and email verification. The full record is the last page of the PDF.
Electronic seal
If the organization turned it on, once every signature is in DataPDFEngine seals the PDF (PAdES): Acrobat flags any later change. The seal attests the integrity of the file, not the identity of the signers.
The seal certificate
The seal is signed with a certificate issued by DataPDFEngine, not by an authority on Adobe's list: this is why Acrobat shows “Signature validity is unknown” with a yellow triangle, while confirming the document was not changed. To be sure the seal is ours, open the signature panel in Acrobat, show the certificate and compare its SHA-256 fingerprint with this one.
The check confirms that the file matches the one DataPDFEngine recorded. It is not legal advice and does not attest the content of the document or the identity of the signers beyond what the audit record states.