Signature validation

Is this signed PDF genuine? Check before you act on it.

Upload any signed PDF, including one you didn’t send through Documentas, and get a clear verdict on every signature and on whether the file changed after signing.

Book a 15-minute walkthrough

Documentas

A clear verdict

Four answers, in plain words.

Valid

Every signature checks out and the file hasn’t changed since it was signed.

Not valid

A signature fails, or the file was changed after signing, even when the certificate itself is fine.

Can’t be confirmed

The signature can’t be fully verified, for example when there’s no proof it existed before its certificate’s status could have changed. The technical details say why.

No digital signatures

The PDF carries no digital signatures to check.

Every signature, explained

Who signed, when, and with what.

Each signature with the signer’s name, signing time, certificate and issuer
Does the signature cover the whole document?
Does the file carry long-term validation?
Does it have document timestamps?
Technical details for experts: the AdES result and the reason in plain words, the timestamp authority, and both the signer’s claimed time and the authority’s time

Document signed on a phone, with the signature logged in the audit trail and every digital signature shown as valid

Checks you can trust

Changed after signing? You’ll see it.

Tamper detection

A file changed after it was signed shows as not valid, even when the certificate itself is fine.

Nothing is kept

The file is checked and then deleted from the check service.

Documentas documents too

Documents signed in Documentas are checked automatically once they are fully signed, and the result is stored with the document.

Who needs this

Anyone who acts on signed PDFs from others

Accounts payable

Check signed invoices and payment confirmations before you pay.

Legal

Check contracts signed by the other side before you countersign or file them.

Procurement

Check supplier agreements and certificates as they come in.

HR

Check signed documents candidates and employees send back.

Notaries and banks

Check signed PDFs from customers, authorities and courts.

Finance and compliance

Know a signed PDF is genuine and unaltered before acting on it.

For legal and finance

FAQ

Questions people ask

Can I check a PDF that wasn’t signed in Documentas?

Yes. Upload any signed PDF, from customers, suppliers, banks, authorities or courts.

What does “Can’t be confirmed” mean?

The signature couldn’t be fully verified. A common reason is that nothing proves the signature existed before its certificate’s status could have changed. The technical details give the reason in plain words.

What does “covers the whole document” mean?

A signature covers the file as it was when it was signed. If content was added afterwards, the signature doesn’t cover it, and the check says so.

Is my file stored?

No. The file is checked and then deleted from the check service.

Are documents signed in Documentas checked too?

Yes. Once a document is fully signed, Documentas checks its electronic signatures once and stores the result with the document.

See it with your own documents.

Book a 15-minute walkthrough and we’ll set up your first form or signing flow with you.