Combine Multiple PDFs in C# and .NET

Programmatically merging PDF files is a common requirement in various business scenarios, such as consolidating reports, merging scanned documents, or combining multiple PDF files into a single file for distribution. In C# and .NET this can be achieved using the SautinSoft.Pdf .Net library.

To combine PDF files using C# and .NET, follow these steps:

  1. Add SautinSoft.PDF from NuGet.
  2. Prepare a list with PDFs to merge.
  3. Use PdfMerger to combine PDFs.
  4. Save the document.

Output result:

Combining PDF files in C# and .NET is a simple task using the SautinSoft.Pdf .Net library. By following the steps described above, you can combine multiple PDF documents into a single file with minimal effort. This functionality is necessary for applications that need to perform document management tasks.

Complete code

using System;
using System.IO;
using System.Collections.Generic;
using SautinSoft;
using SautinSoft.Pdf;
using SautinSoft.Pdf.Content;
using SautinSoft.Pdf.Facades;

namespace Sample
{
    class Sample
    {
        /// <summary>
        /// Merge PDF files.
        /// </summary>
        /// <remarks>
        /// Details: https://sautinsoft.com/products/pdf/help/net/developer-guide/merge-pdf-files.php
        /// </remarks>
        static void Main(string[] args)
        {
            // Before starting this example, please get a free 100-day trial key:
            // https://sautinsoft.com/start-for-free/

            // Apply the key here:
            // PdfDocument.SetLicense("...");

            MergePdfFiles();
        }

        static void MergePdfFiles()
        {
            var inpFiles = new List<string>(Directory.GetFiles(Path.GetFullPath(@"..\..\..\"), "*.pdf"));
            string outFile = Path.GetFullPath(@"Merged.pdf");

            // Create a PDF merger.
            var merger = new PdfMerger();

            // Merge multiple PDF documents to the one.
            foreach (var inpFile in inpFiles)
                merger.Append(inpFile);

            merger.Save(outFile);

            // Show the result.
            System.Diagnostics.Process.Start(new System.Diagnostics.ProcessStartInfo(outFile) { UseShellExecute = true });
        }
    }
}

Download

In the example above, you can see that the source PDF file is combined and the pages cloned into a new PDF.Net, which is then saved to a PDF file.

If you need a new code example or have a question: email us at support@sautinsoft.com or ask at Online Chat (right-bottom corner of this page) or use the Form below:


Questions and suggestions from you are always welcome!

We are developing .Net components since 2002. We know PDF, DOCX, RTF, HTML, XLSX and Images formats. If you need any assistance with creating, modifying or converting documents in various formats, we can help you. We will write any code example for you absolutely free.