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Authorized use only. Use this tool solely on systems, tokens, and assets you own or are explicitly permitted to test — credential extraction, signature forging, and unauthorized access are prohibited by our Acceptable Use Policy.

PDF Signature Checker

Check PDF Signatures

About the PDF Signature Checker

Digital signatures in PDFs verify that the document has not been modified since signing and confirm the identity of the signer. Checking these signatures is essential for contracts, legal documents, and compliance.

Upload a PDF to check for digital signatures. The tool verifies certificate chains, checks for post-signing modifications, and displays signer information. Your document never leaves the browser.

How to use

  1. Upload or drag a PDF file.
  2. The tool scans for digital signatures.
  3. Review signer identity and certificate validity.
  4. Check whether the document was modified after signing.

Frequently Asked Questions

What does a valid digital signature mean? ▾

It means the document has not been modified since it was signed, and the signer identity matches the certificate. It does not guarantee the content is truthful — only that it is unaltered.

Can unsigned PDFs be verified? ▾

No — if the PDF has no digital signature, there is no cryptographic way to verify its integrity. The tool will report that no signatures were found.