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Verify signatures

Check whether a signed PDF was changed after signing and who signed it.

Runs in your browser — files never leave your deviceInput: PDFOutput: ReportSee limitations

or drag and drop a file here

PDF

About Verify signatures

For each signature: checks that the signed bytes are unchanged, that the signature matches the signer's certificate, and whether content was added after signing. Certificate trust and revocation are not checked — this is stated in the report.

How it works

  1. Add your pdf — drag and drop or browse.
  2. Click the action button and wait a moment.
  3. Download the result. Nothing was uploaded.

Good to know

  • Does not check certificate chains against trusted roots, or revocation (OCSP/CRL).
  • Supports adbe.pkcs7.detached and ETSI.CAdES.detached RSA signatures.

Related tools

Digital signatureSign a PDF cryptographically with your certificate (.p12/.pfx).Validate PDFCheck a PDF for structural errors, broken pages, missing fonts and other problems.Protect PDFAdd a password with AES-256 encryption.Restrict permissionsPrevent printing, copying or editing while the PDF still opens without a password.