How can I sign PDF on Windows PC without online tools?

Set-OfficePdfSignature can sign PDF free on a Windows PC, but it has an important limitation: it does not create a digital signature from scratch. It inserts externally generated signature data into a prepared PDF signature field.

It belongs to the PSWriteOffice PowerShell module.

How to sign pdf free on Windows:

1. Install the PowerShell module

Install-Module PSWriteOffice -Scope CurrentUser

2. Prepare the PDF for signing

$plan = New-OfficePdfSignature 
  -Path ".\Input.pdf" 
  -OutputPath ".\Prepared.pdf" 
  -FieldName "Approval" 
  -Name "Your Name" 
  -PassThruReport

3. Generate the digital signature

Use an external signing tool or service with the PDF's returned byte-range information to generate CMS or CAdES signature data.

4. Insert the signature

Set-OfficePdfSignature 
  -Path ".\Prepared.pdf" 
  -SignaturePath ".\signature.der" 
  -OutputPath ".\Signed.pdf"