🔏

Digitally Sign PDF

Cryptographically sign a PDF with your certificate (.p12/.pfx) — tamper-evident PAdES-B-B. Signing happens in your browser; your private key is never uploaded.

Drop a PDF here or click to choose

Your PDF and private key stay in your browser.

Certificate file (.p12 / .pfx)

Certificate password

Signer name (optional)

Reason (optional)

No certificate? Generate a self-signed one for testing:

Name on certificate

⚠️ Self-signed certificates are cryptographically valid but appear as "untrusted" in PDF readers. For trusted or legal signatures, use a certificate from a Certificate Authority.