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How to digitally sign an existing PDF document using C# and VB.NET

Syncfusion Essential PDF is a .NET PDF library used to create, read, and edit PDF documents. Using this library, you can digitally sign an existing PDF document using C# and VB.NET.

 Steps to digitally sign an existing PDF document programmatically:

  1. Create a new C# console application project.

Create a console application project

  1. Install the Syncfusion.Pdf.WinForms NuGet package as reference to your .NET Framework application from NuGet.org.

NuGet reference screenshot

  1. Include the following namespaces in Program.cs file.



  1. Use the following code snippet to digitally sign an existing PDF document.



A complete working sample can be downloaded from DigitalSignatureSample.zip.

By executing the program, you will get the PDF document as follows.

Output document screenshot

Take a moment to peruse the documentation, where you can find options like adding a digital signature using stream, adding a timestamp in digital signature and features like redacting PDF document and protect PDF document with code examples.

Refer here to learn more about PDF digital signature and timestamp in Essential PDF.


Starting with v16.2.0.x, if you reference Syncfusion assemblies from trial setup or from the NuGet feed, include a license key in your projects. Refer to link to learn about generating and registering Syncfusion license key in your application to use the components without trail message.




Article ID: Published Date: Last Revised Date: Platform: Control:
884 04/30/2011 11/21/2018 WinForms PDF
Did you find this information helpful?
Navneet Saraswat Nov 27, 2017


the sample download link Signature_753104ff.zip is not working, can you please check?


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