Certificate PDF signing
Private signing workspace · no analytics or external scripts
Sign with a certificate
Create a cryptographic PDF signature using your own RSA P12/PFX certificate. The file, private key and password stay in this browser. No account or payment is required.
One unsigned PDF up to 4 MB / 200 pages. Existing signature fields are not supported. This adds an invisible signature shown in your PDF reader’s signature panel; it does not add handwriting.
Certificate trust depends on the recipient’s PDF reader. This tool does not check revocation or add a trusted timestamp, long-term validation, or a qualified electronic signature.