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How to digitally sign a PDF file in C#, VB.NET

PDF documents are digitally signed using x509 certificates such as .pfx files with private keys and support for Hardware Security Module (HSM), Online Certificate Status Protocol (OCSP), Certificate Revocation List (CRL), and Windows Certificate Store to offer authenticity and integrity.

Syncfusion Essential PDF is a .NET PDF library used to create, read, and edit PDF documents. Using this library, you can add digital signature to the PDF document in C# and VB.NET.

Steps to digitally sign a PDF document programmatically:

  1. Create a new C# console application project.

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

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

 

 

  1. Use the following code snippet to add a digital signature in the PDF document.

 

 

Download the work sample from CreateDigitalSignatureSample.Zip

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

Take a moment to peruse the documentation, where you can find other options like adding a digital signature using stream, signing an existing document, adding a timestamp in digital signature and features like PDF form filling, extract text or images from PDF, protect PDF documents etc., with code examples.

Refer here to explore the rich set of Syncfusion Essential PDF features.

An online sample link to generate Digitally signed PDF document

Note:

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:
9082 08/06/2018 08/28/2018 Windows Forms PDF
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