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Validate a PDF Signature

Validation checks a signed document and reports who signed it, whether the certificate was trusted, and whether anything changed after signing. It is the step people skip and then regret when a document turns out to have been altered.

How to Validate a PDF Signature

  1. Upload the signed PDF.
  2. Run the validation check.
  3. Read the report on signer, certificate and document integrity.

When you would use this

  • Verifying a signed contract received from a counterparty.
  • Checking a supplier's certificate has not expired.
  • Confirming an archived signed record is still intact.

Questions

What does an invalid signature mean?

Usually that the document changed after signing, or that the certificate had expired or was not from a trusted authority. The report distinguishes these.

Can a valid signature still be untrustworthy?

Yes. Valid means the maths checks out. Whether you trust the signer's identity is a separate judgement.

Does opening a signed PDF break the signature?

No. Only changing and saving the file does.

Need this at scale?

These tools handle one document at a time. When the job is thousands of files, Greenbooks handles document digitization as a managed service, including bulk scanning, OCR and metadata capture, with the output loaded into DocuVenta DMS. Talk to us about volume work.

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