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Sign with certificate

Sign locally with a P12 or PFX certificate.

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A local P12/PFX signature. No timestamp or online validation service is contacted.

How to use Sign with certificate

Sign an exported PDF copy using a local PKCS#12 or PFX certificate. Create a cryptographic signature without uploading the PDF or certificate.

  1. Choose a PDF and your P12 or PFX certificate.
  2. Enter the certificate password and a reason for signing.
  3. Run Certificate sign and download the signed copy.

This creates a basic invisible digital signature. Encrypted or already signed sources are rejected. No online timestamp, certificate validation, or revocation service is contacted.

Files and passwords stay on your device. Download results to keep a copy.