Open the site: PDF into PDF . Drag and drop PDF files to merge them online. Or just use a code sample in C# with a few lines of code. Install Aspose.Words for .NET. Add a library reference (import the library) to your C# project. Open the source PDF file in C#. Combine PDF files in a few seconds. Call the AppendDocument() method, passing an output filename with required extension. Get the result of merging PDF as a single file.

Why merge PDF together in C#?

Merging a group of PDF into one allows you to handle materials more effectively.

What output file formats can I use to combine PDF files?

We support a variety of output file formats for PDF merging, including PDF, DOCX, DOC, HTML, RTF, Markdown, XML, ODT, JPG, PNG, TIFF, TXT and many more.

What is the maximum PDF size supported by Aspose.Words for .NET?

There are no size limits to merge PDF files using Aspose.Words for .NET.

C# Merge PDF

Convert PDF in C#

C# library allows .NET developers to convert PDF files easily. PDF conversion engine analyses the original PDF layouts and styles, then exports the combined content to the required format.

PDF conversion may be tricky, unless you have a professional tool to do the job. Use C# to convert PDF files with maximum flexibility and speed. Run online live demo and check the highest quality of PDF conversion right in a browser. PDF Conversion API supports a bunch of useful options.

Merge PDF

Enhance PDF format capabilities with Aspose.Words for .NET. This is a simple way to combine PDF files with C# library that handles all low-level details.

Merge PDF and save the result as a single file. If you develop code in C#, this will be simpler than it sounds. See C# example that iterates through PDF documents and combines them:

Code example in C# to merge PDF files

Input files

Upload a file you want to merge

Run code

Upload a file you want to merge

Output format

Select the target format from the list

dotnet add package Aspose.Words

Copy

using Aspose.Words;

var fileNames = new List<string> { "Input1.pdf", "Input2.pdf" };

var output = new Document();
// Remove all content from the destination document before appending.
output.RemoveAllChildren();

foreach (string fileName in fileNames)
{
    var input = new Document(fileName);
    // Append the source document to the end of the destination document.
    output.AppendDocument(input, ImportFormatMode.KeepSourceFormatting);
}

output.Save("Output.pdf");

			

					Run code
				

You may freely download this code or copy it in any applicable purpose

How to merge PDF C#

Install Aspose.Words for .NET.
Add a library reference (import the library) to your C# project.
Open the source PDF file in C#.
Combine PDF files in a few seconds.
Call the AppendDocument() method, passing an output filename with required extension.
Get the result of merging PDF as a single file.

C# library to merge PDF files

There are three alternative options to install "Aspose.Words for .NET" onto your system. Please choose one that resembles your needs and follow the step-by-step instructions:

Install a NuGet Package. See Documentation
Install the library using Package Manager Console within Visual Studio IDE
Install the library manually using Windows Installer

System Requirements

Our product is fully cross-platform and supports all major .NET implementations:

.NET ≥ 5.0
.NET Core ≥ 2.0
.NET Standard ≥ 2.0
.NET Framework ≥ 3.5
MonoMac
MonoAndroid
Xamarin

As far as .NET code doesn't depend on the underlying hardware or operating system, but only on a Virtual Machine, you are free to develop any kind of software for Windows, macOS, Android, iOS and Linux. Just make sure you have installed the corresponding version of .NET Framework, .NET Core, Windows Azure, Mono or Xamarin.

We recommend using Microsoft Visual Studio, Xamarin, and MonoDevelop integrated development environments to create C#, F#, VB.NET applications.

Fore more details please refer to Product Documentation.

You can merge PDF to many other file formats: