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GroupDocs.Merger allows developers to merge PDF files when it’s needed to organize multiple PDF files into single document or send fewer attachments etc. And you can do this without any third-party software or manual work involved. With GroupDocs.Merger it is possible to combine PDF documents of any size and structure - all text, images, tables, graphs, forms and other content will be preserved.

The following example demonstrates how to merge PDF files with several lines of C# code:

• Create an instance of Merger class and pass source PDF file path as a constructor parameter. You may specify absolute or relative file path as per your requirements.
• Add another PDF file to merge with Join method. Repeat this step for other PDF documents you want to merge.
• Call Merger class Save method and specify the filename for the merged PDF file as parameter.

// Load the source PDF file
using (Merger merger = new Merger(@"c:\sample1.pdf"))
{
    // Add another PDF file to merge
    merger.Join(@"c:\sample2.pdf");
    // Merge PDF files and save result
    merger.Save(@"c:\merged.pdf");
}

Also, there is an ability to merge Pdf files with bookmarks, please see an according example below:

// Load the source PDF file
using (Merger merger = new Merger(@"c:\sample1.pdf"))
{
    // Init PdfJoinOptions with UseBookmarks flag
    PdfJoinOptions pdfJoinOptions = new PdfJoinOptions();
    pdfJoinOptions.UseBookmarks = true;
    // Add another PDF file to merge
    merger.Join(@"c:\sample2.pdf", pdfJoinOptions);
    // Merge PDF files and save result
    merger.Save(@"c:\merged.pdf");
}

You can read the following article: How to correctly merge PDF streams

Portable Document Format (PDF) is a type of document created by Adobe back in the 1990s. The purpose of this file format was to introduce a standard for representation of documents and other reference material in a format that is independent of application software, hardware as well as Operating System. PDF files can be opened in Adobe Acrobat Reader/Writer as well in most modern browsers like Chrome, Safari, Firefox via extensions/plug-ins.

Please find more use-cases and complete C# sources of our backend and frontend examples and try them for free!

GroupDocs.Merger for .NET provides an online PDF Merger App, which allows you to try it for free and check its quality and accuracy.