Sign PDF
Sign a PDF with a certificate you already own. Upload your PKCS#12 (.p12 or .pfx) file and its password, and the document is digitally signed so recipients can verify it has not been altered. You are responsible for your certificate's validity and trust.
Common questions
What certificate do I need?
A PKCS#12 (.p12 or .pfx) file containing your signing certificate and private key, plus its password.
Is this a real digital signature?
Yes. It applies a cryptographic signature using your certificate. Whether recipients trust it depends on the certificate's issuing authority, not on this tool.
Can I draw or type a signature, or add a timestamp?
No. This tool applies a certificate-based signature only. It does not place a drawn or typed signature image and does not add a trusted timestamp.