We’re happy to announce the release of GroupDocs.Comparison for .NET 26.8, available as of August 2026.
GroupDocs.Comparison version 26.8 focuses on the Side-by-Side comparison mode: the comparer now builds its result fully in memory instead of relying on temporary files, the detected change list is available for Side-by-Side PDF results, and a concurrency issue that caused crashes during parallel PDF comparison has been fixed.

Fixes and enhancements

  • [Enhancement] In-memory stream processing in Side-by-Side comparison. (COMPARISONNET-4828)
  • [Enhancement] Change list is now available for Side-by-Side PDF results. (COMPARISONNET-4728)
  • [Bug] Fix crashes during concurrent PDF comparison. (COMPARISONNET-4830)

Change list is now available for Side-by-Side PDF results

Previously, when the comparison result was generated in the Side-by-Side PDF mode, the list of detected changes was not returned. Starting from this release, Compare returns the full change collection in this mode as well, so the changes can be inspected, counted, or exported alongside the produced document.

using (Comparer comparer = new Comparer("source.docx"))
{
    comparer.Add("target.docx");

    var options = new PdfCompareOptions()
    {
        DisplayMode = PdfCompareOptions.ComparisonDisplayMode.SideBySide,
    };

    comparer.Compare("result.pdf", options);

    ChangeInfo[] changes = comparer.GetChanges();

    foreach (ChangeInfo change in changes)
    {
        Console.WriteLine($"{change.Id}: {change.Type} - {change.Text}");
    }
}

Fix crashes during concurrent PDF comparison

Running several PDF comparisons in parallel could lead to unexpected exceptions and process crashes caused by shared state inside the PDF processing pipeline. The affected components are now thread-safe, so multiple PDF comparisons can be executed simultaneously — for example, from a web service handling concurrent requests or from parallel batch processing.

How to get the update

You can get the latest version from NuGet or download it directly from the GroupDocs website.

NuGet

GroupDocs.Comparison for .NET 26.8

Direct download

Download assemblies for both .NET and .NET Framework from the GroupDocs.Comparison for .NET 26.8 page.

Learn more