PDF

Sign PDF

Cryptographically sign a PDF with a PFX/P12 certificate and add a visible signature field.

Input

File and output

PDF

Drag a PDF or click to choose it.

PDF. Limits depend on your plan.

File name

Pages Example: 1,3,5-8. Leave empty to use all. Password Only used when the PDF is protected or when you want to protect it. PFX/P12 certificate Cryptographic digital signature. Upload your .p12 or .pfx; the signature covers the full PDF and shows a visible field on the selected page.

Signer name Certificate password Signing reason Location Signer contact

Position

Result

File ready

PDF

Waiting for file

The result will appear here.

Format: -
Size: -
Pages: -

API

Also available by API

Use the mirror endpoint with multipart or base64 JSON. API balance stays separate from web NOX.

Billing validates balance before processing and only charges after a successful output.

POST /api/v1/tools/pdf-sign
Authorization: Bearer TU_API_KEY
Content-Type: application/json

{
  "pdf_base64": "data:application/pdf;base64,...",
  "certificate_base64": "data:application/x-pkcs12;base64,...",
  "certificate_password": "mi-clave",
  "signer_name": "Miguel angel",
  "reason": "Aprobado",
  "pages": "1",
  "position": "bottom_right"
}