PDF Signature Checker

This tool only detects whether a signature field is present and reads its declared metadata. It does NOT cryptographically verify that the signature is valid, untampered, or from a trusted certificate — use Adobe Acrobat or a dedicated PDF signing platform for real verification.

How to use this PDF signature checker

  1. Select a PDF file.
  2. See whether it contains any signature fields.
  3. Review the declared signer, date, and reason for each signature found.

What does this actually check?

It scans the PDF's internal structure for signature dictionary objects and reads their declared fields (name, date, reason, location) as embedded by whatever tool created the signature — this confirms a signature field exists and what it claims, not that it's cryptographically valid.

Why doesn't this verify the signature is valid?

Real cryptographic verification requires parsing PKCS#7/CMS signature data and validating a certificate chain against trusted root authorities — a much deeper process that dedicated PDF software handles. This tool only reads the plain-text metadata fields, which can be misleading if forged.

Can a PDF have multiple signatures?

Yes, PDFs support multiple signature fields, often used for multi-party approval workflows — this tool lists each one it finds separately.