Adding Digital Signature to PDF in C# (.NET Core)

Visible and Invisible Digital Signatures can be added to PDF using DynamicPDF Generator product.

How to add Visible Digital Signature to PDF in C#

Below are the steps and sample code to add Visible Digital Signature to PDF document using the Generator product.

Steps for Adding Visible Digital Signature to a PDF Document

  1. Create a Document object.
  2. Create as many Page object as needed.
  3. Create a Signature object and set the properties.
  4. Add Signature to the Page.
  5. Add Page to the Document.
  6. Create a Certificate object and set the properties.
  7. Sign the document with the Visible Digital Signature field name.
  8. Save the PDF document.

Sample Code - C#

Document document = new Document();
Page page = new Page(PageSize.Letter);
            
Signature signature = new Signature("SigField", 10, 10, 250, 100);
page.Elements.Add(signature);
document.Pages.Add(page);
Certificate certificate = new Certificate(@"C:\JohnDoe.pfx", "password");

document.Sign("SigField", certificate);
            
document.Draw(@"C:\Output.pdf");        

How to add Invisible Digital Signature to PDF in C#

Below are the steps and sample code to add invisible Digital Signature to PDF document using the Generator product.

Steps for Adding Invisible Digital Signature to a PDF Document

  1. Create a Document object.
  2. Create as many Page objects as needed.
  3. Add Page to the Document.
  4. Create a Certificate object and set the properties.
  5. Sign the document with a non existent field name and the Certificate.
  6. Save the PDF document.

Sample Code - C#

Document document = new Document();
Page page = new Page();

document.Pages.Add(page);
Certificate certificate = new Certificate(@"C:\JohnDoe.pfx", "password");

// Field name should not match any field names in the document 
document.Sign("NonExistingField", certificate);
document.Draw(@"C:\Output.pdf");         

Getting Started

NuGet Package

DynamicPDF Generator is available on NuGet and is part of the ceTe.DynamicPDF.CoreSuite.NET package. The Core Suite package includes Generator, Merger and ReportWriter.

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NuGet Package ID: ceTe.DynamicPDF.CoreSuite.NET

Example Project

An example project showing this functionality can be cloned or viewed from GitHub:

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Clone or View Example Project on GitHub

DynamicPDF Generator Information

More information can be found here:

Available in other platforms

DynamicPDF Generator is available for the following platforms. Refer to the respective product pages for more details.

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