Free PDF tool

Verify a PDF digital signature

Upload a signed PDF to check its embedded digital signatures, signer certificates, claimed signing time, PAdES level, and whether the document changed after signing.

  • Check whether the PDF contains one or more digital signatures.
  • Review signer, certificate, timestamp, and validation details.
  • See cryptographic integrity and later revision information when available.

Your upload is processed only to verify the PDF and is deleted immediately afterwards.

Check a PDF digital signature online

A digital signature verifier helps you inspect whether a signed PDF contains a valid cryptographic signature and whether the document appears to have been changed after it was signed. Upload the original PDF to review the available validation evidence in one place.

How to verify a digital signature in a PDF

  1. Upload the signed PDF. Select a PDF file up to 25 MB.
  2. Run the check. Choose Verify signature to inspect its embedded signatures.
  3. Review the result. Check the signer, certificate status, signing time, integrity, and later revisions.

What the verification results mean

Cryptographic integrity: indicates whether the signed content remains consistent with the signature.

Certificate status: shows the available validation status for the certificate associated with the signer.

Claimed signing time: shows the signing time embedded in the signature when supplied by the PDF.

Later revisions: indicates whether changes or revisions were detected after a signature was applied.

When to verify a signed PDF

Use this tool before relying on an electronically signed contract, invoice, certificate, compliance record, application, or other document where signer identity and document integrity matter. It is useful for legal, finance, HR, procurement, real estate, and operations teams.

PDF digital signature verifier FAQ

What does a PDF signature verifier check?

It checks the embedded digital signatures in a PDF and reports signer details, certificate status, signing time, cryptographic integrity, validation status, PAdES level, and later revisions when those details are available.

How do I verify a digital signature in a PDF?

Choose a signed PDF, select Verify signature, and review the result. The verifier reports whether signatures were found and shows the available signer, certificate, timestamp, integrity, and revision information.

Can I check a PDF signature online for free?

Yes. This free online PDF signature verifier accepts PDF files up to 25 MB and returns a verification summary without requiring an account.

What is the difference between a digital signature and an electronic signature?

An electronic signature is a broad way to indicate agreement. A digital signature is a cryptographic signature tied to a certificate that can help verify the signer and whether the signed PDF changed afterward.

What happens to my uploaded PDF?

The file is sent to the verification service only for signature analysis and is deleted immediately after processing.

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