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How to merge PDF files in C#, VB.NET

Syncfusion Essential PDF is a .NET PDF library that allows you to combine or merge different PDF files into one file quickly and accurately. Merge PDF functionalities can be used in any .NET application, whether it is Windows Forms, WPF, ASP.NET (web forms, MVC, Core) or even UWP, Xamarin.Forms, Xamarin.Android, and Xamarin.iOS. It will help you combine, import, and append PDFs with just a few lines of code using C# or VB.NET.

Steps to merge multiple PDF files programmatically:


  1. Create a new C# console application project.


Create a console application in Visual Studio


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


NuGet package reference screenshot


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




  1. Use the Merge() method with source parameter that is an string array of PDF files to get the merged final PDF document in finalDoc.



  1. Use the following C# and VB.NET code snippet to merge multiple PDF documents from disk.




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

The inputs of the PDF document are as follows.

Input 1


Input file to be merged


Input 2


Input file to be merged


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


Ouput of Merged PDF file


Take a moment to peruse the documentation to merge the multiple PDF documents with string array and importing pages from multiple documents with Essential PDF. Also,  brief details about split, delete and rotate PDF pages are available with code examples.


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


An online sample link to merge PDF documents.



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:
9146 08/14/2018 12/14/2018 WinForms PDF
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