Validate PDF Signature
Check whether a PDF contains a signature field and read any signer, reason, or date metadata inside it. Detection only, not cryptographic trust validation. Free, private, browser-based.
Click to select a PDF file, or drag and drop
Your file never leaves your browserHow to Check a PDF for Digital Signatures
- Upload the PDF you want to inspect.
- Click Check for Signatures — the tool looks for a signature dictionary in the PDF's form (AcroForm) structure.
- Review any signer name, reason, date, or location fields found inside each signature.
Example
A contract signed in Adobe Acrobat contains a signature field named "Signature1" with a signer name, the reason "I agree to the terms of this document", and a signing date. This tool surfaces that metadata so you can see who claims to have signed it and when — without needing a PDF reader with signature-panel support.
Common Use Cases
- Quickly checking whether a received PDF contains any signature fields at all.
- Reading the signer name, reason, or date embedded in a signature without opening desktop software.
- Spot-checking documents before routing them into a workflow that expects a signed PDF.
FAQ
- Does this verify the signature is valid or trustworthy? No. This is presence-and-metadata detection only. Verifying a cryptographic signature means checking the signed hash against the document, validating a certificate chain up to a trusted root, and checking revocation status — none of that is possible in a static, offline browser tool. Use a full PDF reader like Adobe Acrobat, or a dedicated PKI validation service, for actual trust verification.
- Why does it say a signature was found but shows no signer name? Not every signature dictionary populates the optional Name/Reason/Location fields — some signing tools only embed the cryptographic data itself, with signer identity carried entirely in the certificate rather than as plain metadata.
- Is my file uploaded anywhere? No — everything runs entirely in your browser.