GroupDocs.Comparison

Document Comparison .NET API

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On-premise library to compare documents in applications based on .NET platform. Retrieve the list of changes in the desired format with a line-by-line comparison of content, paragraphs, characters, styles, shapes, and position.

Please note: our library implies the use of .NET programming languages, compatible with CLI infrastructure. For Node.js, Java and Python languages, we recommend you get GroupDocs.Comparison for Node.js, GroupDocs.Comparison for Java and GroupDocs.Comparison for Python, respectively.

Document Comparison Features

• Compare and detect differences among similar documents.
• Support for 55+ popular document formats from various categories.
• Visual separation of detected changes with the ability to accept or reject modifications.
• Generate document preview.
• Compare paragraphs, words and characters.
• Identify content styling and formatting changes.
• Set metadata from the source, target files or keep it user-defined.
• Make the resultant document password protected.

Supported Microsoft Office Formats

Microsoft Word: DOC, DOCM, DOCX, DOT, DOTM, DOTX
Microsoft Excel: XLS, XLT, XLSX, XLTM, XLSB, XLSM, XLSX, CSV
Microsoft PowerPoint: POT, POTX, PPS, PPSX, PPTX, PPT
Microsoft OneNote: ONE
Microsoft Visio: VSDX, VSD, VSS, VST, VDX

Other Supported Formats

OpenDocument: ODT, ODP, OTP, ODS, OTT
Fixed Layout: PDF
AutoCAD: DWG, DXF
Email: EML, EMLX, MSG
Images: BMP, GIF, JPG, JPEG, PNG
Web: HTM, HTML, MHT, MHTML
Text: RTF, TXT
eBook: MOBI, DjVu
Medical Imaging: DCM
Programming Language: CS, JAVA, CPP, JS, PY, RB

See the full list of supported formats.

Develop & Deploy GroupDocs.Comparison Anywhere

Microsoft Windows: Windows Azure, Microsoft Windows Desktop (x86, x64), Microsoft Windows Server (x86, x64)
macOS: Mac OS X
Linux: Ubuntu, OpenSUSE, CentOS, and others
Development Environments: Microsoft Visual Studio (2010 & up), Xamarin.Android, Xamarin.IOS, Xamarin.Mac, MonoDevelop 2.4 and later
Supported Frameworks: .NET Standard 2.0, .NET Framework 2.0 or higher, .NET Core 2.0 or higher, Mono Framework 1.2 or higher

Get Started

Are you ready to give GroupDocs.Comparison for .NET a try? Simply execute Install-Package GroupDocs.Comparison from Package Manager Console in Visual Studio to fetch & reference GroupDocs.Comparison assembly in your project. If you already have GroupDocs.Comparison for .NET and want to upgrade it, please execute Update-Package GroupDocs.Comparison to get the latest version.

Compare PDF Files in C# Code

// Specify the source document
using (Comparer comparer = new Comparer("source.pdf"))
{
    // Add one or more target documents
    comparer.Add("target.pdf");

    // Compare and save result
    comparer.Compare("result.pdf", options);
}

Compare JSON Files and get list of changes via C#

// Initialize the comparer with the source JSON file
using (Comparer comparer = new Comparer("source.json"))
{
    // Add the target JSON file for comparison
    comparer.Add("target.json");

    // Compare the files (changes are tracked internally)
    comparer.Compare();

    // Retrieve the list of changes between the source and target files
    ChangeInfo[] changes = comparer.GetChanges();

    // Iterate through each change and display its details
    foreach (ChangeInfo change in changes)
        Console.WriteLine("Change Type: {0}, Change ID: {1}, Text: {2}", 
            change.Type, 
            change.Id, 
            change.Text
        );
}

Get file info for the DOCX file with C#

// Initialize the comparer with the source DOCX file
using (Comparer comparer = new Comparer("source.docx"))
{
    // Retrieve document metadata such as page count and size
    IDocumentInfo info = comparer.Source.GetDocumentInfo();

    // Iterate through each page to display detailed information
    for (int i = 0; i < info.PageCount; i++)
    {
        Console.WriteLine("\n" +
            "Page number: {5}\n" +              // Current page number
            "File type: {0}\n" +                // Type of the file
            "Number of pages: {1}\n" +          // Total page count
            "Document size: {2} bytes\n" +      // File size in bytes
            "Width: {3}\n" +                    // Width of the current page
            "Height: {4} ",                     // Height of the current page
            info.FileType, 
            info.PageCount, 
            info.Size, 
            info.PagesInfo[i].Width, 
            info.PagesInfo[i].Height, 
            i + 1                               // Adjust page index to 1-based numbering
        );
    }
}

Compare PNG Files using C# and customize changes styles

// Initialize the comparer with the source PNG file
using (Comparer comparer = new Comparer("source.png"))
{
    // Add the target PNG file for comparison
    comparer.Add("target.png");

    // Define custom styles for inserted and deleted items
    CompareOptions compareOptions = new CompareOptions()
    {
        InsertedItemStyle = new StyleSettings()
        {
            // Highlight inserted items in green
            HighlightColor = System.Drawing.Color.Green,
            FontColor = System.Drawing.Color.Green,
        },
        DeletedItemStyle = new StyleSettings()
        {
            // Highlight deleted items in red
            HighlightColor = System.Drawing.Color.Red,
            FontColor = System.Drawing.Color.Red,
        }
    };

    // Perform the comparison and save the result with the customized styles
    comparer.Compare("result.png", compareOptions);
}

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