T
ToolifyitDeveloper toolbox

PDF signature checker

PDF

Upload a PDF to check whether it carries a valid digital signature. The tool reports overall integrity, authenticity, and certificate expiry, and shows the full certificate chain including issuer, subject, validity period, and signer metadata such as name, reason, and location. Everything runs locally in your browser — the PDF is never uploaded to a server.

Choose a PDF file to check its digital signatures.

FAQ

What does a PDF digital signature verify?

It checks three things: integrity (the document content has not changed since signing), authenticity (the signing certificate is trusted), and expiry (the certificate was valid at signing time).

Is my PDF uploaded to a server?

No. Signature verification runs entirely in your browser using a local library; the file never leaves your device.

What if my PDF has no signature?

The tool reports that no digital signatures were detected. Unsigned PDFs are perfectly normal — most documents are not digitally signed.

Related tools

PDF electronic signatureDraw, type, or upload a signature and place it onto any page of your PDF.PDF mergeFree online PDF merger to combine multiple PDFs into one in the order you choose.PDF page organizerFree online PDF page organizer to rotate, delete, and reorder pages into a new file.