Divide PDFs in memory with C# and .NET

Splitting PDF documents into separate pages is a common task in software development. In this article, we will look at how you can split PDF documents directly in memory, without saving intermediate files to disk, using the C# programming language and platform .NET with a component PDF .Net from SautinSoft.

To complete the task, we will need the following steps:

  1. Add SautinSoft.PDF from NuGet.
  2. Read PDF files into memory.
  3. Split the PDF document using MemoryStream, specifying the page number.
  4. Save the document to show the result.

Output result:

Splitting PDF documents in memory using C# and .NET is an efficient way to process PDF without having to work with the file system. The SautinSoft PDF library .Net provides a simple and powerful API for performing such tasks. Using the above code example, you can easily integrate PDF splitting functionality into your applications.

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>
        /// Split PDF documents in memory using C# and .NET.
        /// </summary>
        /// <remarks>
        /// Details: https://sautinsoft.com/products/pdf/help/net/developer-guide/merge-pdf-documents-in-memory-using-csharp-and-dotnet.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("...");

            SplitPdfInMemory();
        }
        static void SplitPdfInMemory()
        {
            int page = 0;
            using var fs = new FileStream(@"..\..\..\005.pdf", FileMode.Open, FileAccess.ReadWrite);
            foreach (var stream in PdfSplitter.Split(fs, PdfLoadOptions.Default, 0, int.MaxValue))
            {
                using var output = new FileStream($"Page {++page}.pdf", FileMode.Create, FileAccess.ReadWrite);
                stream.CopyTo(output);
            }

            // Show the "Page 5.pdf"
            System.Diagnostics.Process.Start(new System.Diagnostics.ProcessStartInfo("Page 5.pdf") { UseShellExecute = true });
        }
    }
}

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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.