Validate PDF Signature

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Your first check needs no account; after that a free account keeps you validating. Super Users can validate a whole batch — select multiple PDFs, or upload one ZIP containing them.
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Validating Signatures

Verifying digital signatures...

About Signature Validation

Check the digital signatures in a PDF:

  • Who signed it (from the certificate)
  • When it was signed
  • Integrity — whether the content is unchanged since signing
  • Trust — whether the certificate chains to a trusted root
Tip: Need to sign instead? Use the Sign PDF tool.
Tips for Best Results
  • "Intact" means the document has not changed since that signature was applied
  • A signature can be intact yet from an untrusted/self-signed issuer — both are reported separately
  • An incremental edit after signing can leave an earlier signature intact but no longer whole-document
  • Batch validation accepts multiple PDFs or a single ZIP of PDFs (Super User)
  • Validation runs entirely on our servers; your file is deleted automatically within 24 hours
  • To add a signature, use the Sign PDF tool
Frequently Asked Questions

For each digital signature it reports the signer (from the certificate), the signing time, any stated reason/location, and — most importantly — whether the signature is cryptographically intact, meaning the bytes it covers have not been altered since signing.

The signature is mathematically valid, but the signer's certificate does not chain to a certificate authority trusted by this server (for example a self-signed certificate). The signature can still be intact; trust is reported as a separate, informational status.

Your first signature check needs no account. After that a free account keeps you validating — it also downloads the PDF validation report instantly instead of emailing it, and keeps your checks in your file history. There is no charge and no card required; Super User is only needed for batch validation.

Yes — signed-in users (free account) can download a PDF validation report of each check: the signer, signing time, integrity and trust findings, and the file's SHA-256 fingerprint so a counterparty can confirm which exact file the report describes.

Yes — batch validation is a Super User feature. Select multiple PDFs, or upload a single ZIP containing them (up to 25 documents per run), and every document is checked in one pass with a consolidated validation report covering the whole batch.

Yes. Validation is performed on our own servers and the file is deleted automatically within 24 hours (7 days for subscribers). No third-party service is involved.

Working in Adobe Acrobat?

Signatures are usually applied and managed in Adobe Acrobat — the desktop standard for PDF signing.

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Processed on ISO 27001-certified UK servers.

Files are encrypted in transit and automatically deleted.

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