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How to compare two PDF documents

Two PDF documents can be compared using Essential PDF and Essential PDF viewer libraries. The following steps are involved in comparing PDF documents.

  1. Convert the PDF documents to images with the help of Essential PDF viewer.
  2. Compare the images using open source image Magick library.
  3. Save the difference images as PDF document with the help of Essential PDF.

Steps to compare PDF documents programmatically:

  1. Create a new Windows Forms application project.

  1. Install Syncfusion.Pdf.Base, Syncfusion.PdfViewer.Windows and Magick.NET as reference to your .NET Framework application from NuGet.org.







  1. Include the following namespaces in the Form1.Designer.cs file.



  1. Add a new button in Form1.Designer.cs to compare two PDF documents as follows.



  1. Add the following code in ComparePDF to compare the PDF files.



A complete working sample can be download from PDFComparisonSample.zip

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


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:
9232 08/31/2018 09/07/2018 WinForms PdfViewer
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