Check digital signatures
See who signed a PDF, whether it changed afterwards, and the certificate behind it.
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About this tool
Open any digitally signed PDF to check each signature: whether the signed content is unchanged, whether it was made with the signer’s key, what was added afterwards, and who issued the certificate.
- Does it check whether the certificate is trusted?
- It checks the signature, the document and the certificate chain the PDF carries. Whether a certificate authority is trusted, and whether a certificate was revoked, needs a trust list, which Acrobat applies.
- Is it free?
- Yes. Sign Veli’s PDF tools are free to use and need no account.
- Are my files uploaded?
- No. The tool runs entirely in your browser, so your file never reaches Sign Veli’s servers.