What certificate formats are supported?

The tool accepts PKCS#12 certificate bundles in .p12 or .pfx format.

Can I sign a PDF that already has a signature?

No. PDFs that are already signed are rejected.

Is the signature visible on the PDF page?

Yes, by default. You can disable the visible signature block for an invisible certificate signature.

Which signer details can I add?

A signer name is required. You can also add a signature reason, location, and contact information.

Where is a visible signature placed?

Set the page number and the signature X, Y, width, and height values.

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PDF PAdES Certificate Signer

Sign PDFs with a PKCS#12 certificate using an ETSI CAdES detached signature.

Details

What this tool helps you do

Adds a certificate-backed ETSI.CAdES.detached signature, optionally with a visible block, and rejects already signed PDFs.

Execution

Run this tool

Fill in the form, run the tool, and review the result in one place.

Prepared example runs

Click an example to fill the form automatically. File inputs still need an upload.

2 examples

Create a visible PAdES signature

Sign an unsigned PDF with a PKCS#12 certificate and place a visible signer block on page one.

{
  "type": "file",
  "filePath": "/public/processing/pdf_pades_signed_example1.pdf"
}

Add an invisible certificate signature

Attach a certificate-backed detached signature without drawing a visual block over the page.

{
  "type": "file",
  "filePath": "/public/processing/pdf_pades_signed_example2.pdf"
}

Inputs

Options are grouped so long tools stay easier to scan.

14 options

FilesUpload source files for this workflow.2

PDF FilefileRequired

Single file max size: 100 MBSupported types: application/pdf

PKCS#12 CertificatefileRequired

Single file max size: 10 MBSupported types: application/x-pkcs12, application/pkcs12, .p12, .pfx

ContentPaste or type the main input values.5

Certificate PasswordtextOptionalSigner NametextRequiredSignature ReasontextOptionalSignature LocationtextOptionalContact InformationtextOptional

SettingsAdjust formats, ranges, numbers, and modes.6

Page NumbernumberOptionalSignature XnumberOptionalSignature YnumberOptionalSignature WidthnumberOptionalSignature HeightnumberOptionalPlaceholder LengthnumberOptional

TogglesEnable or disable optional behavior.1

Visible SignaturecheckboxOptionalEnabled when checked

Result

Ready for a run

Run the tool to preview files, text, structured data, or streamed output here.

Samples

PDF PAdES Certificate Signer

What this tool helps you do

Run this tool

Prepared example runs

Inputs

Result

Examples that match this tool

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Prepared example runs

Inputs

Result

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Overview

When to use

How it works

Use cases

Examples

1. Create a visible PAdES signature

2. Add an invisible certificate signature

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