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

Syncfusion Essential PDF is a .NET PDF library used to create, read, and edit PDF documents. Using this library, you can merge multiple PDF documents from the disk or stream.


Steps to merge multiple PDF 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.



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




  1. Use the Merge() method with streams parameter that is an array of PDF file streams 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 stream.




A complete working sample can be downloaded from Merge-PDF-File.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 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 OCR processing and Image Extraction 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 09/25/2018 WinForms PDF
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