Add Certificate Digital Signature (P12/PFX)

Sign PDFs cryptographically using an authorized PKCS#12 (.p12/.pfx) certificate and private key (or test self-signed bundle).

Secure server processing

Encrypted upload, auto-deleted

Fast Processing

Results in seconds

Drag & drop your files here

Or click below to browse from your computer or phone (.pdf)

Tool Configuration

Use Ephemeral Self-Signed Test PKCS#12 Certificate (or uncheck to upload your own .p12/.pfx)

Certificate Passphrase

Signing Reason

Signing Location

About this tool

Generates a standard ISO 32000-1 / PAdES (`adbe.pkcs7.detached`) cryptographic digital signature over the document's `/ByteRange` using `pyHanko`. Private keys are unlocked strictly in ephemeral memory and never logged or stored.