PDF Signature Checker

Check PDF Digital Signature

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About PDF Digital Signatures

Digital signatures in PDF documents provide a way to verify the authenticity and integrity of the document. They ensure that the document has not been tampered with since it was signed and can confirm the identity of the signer.

Checking a digital signature involves complex cryptographic processes, including verifying the signer's certificate against trusted authorities and checking certificate revocation lists (CRLs) or using the Online Certificate Status Protocol (OCSP).

Note: This tool attempts to perform both document integrity verification and certificate validation. However, browser-based certificate validation has limitations:

Certificate chain validation is simplified and may not check against all trusted root CAs
Certificate revocation checking (CRL/OCSP) is limited in browser environments
Some PDF signature formats may not be fully supported

For legally binding verification, specialized desktop software or services are recommended.