In this step‑by‑step tutorial we show you how to compare Word documents using C# with a leading document‑comparison library. You’ll quickly learn to implement functionality that compares two Word documents and highlights differences in C#, following detailed instructions and a complete working example.

Steps to Compare Word Documents using C#

1. Install GroupDocs.Comparison for .NET package from the NuGet website in the .NET project
2. Add a reference to the GroupDocs.Comparison namespace to compare two Word files
3. Create an instance of the Comparer class and pass the source Word file to its constructor
4. Call Add method of the Comparer class and specify the target Word document
5. Finally, call the Compare method to save the resultant file to the disk

In the above section, we have listed the points to compare Word documents for differences using C#. These instructions can be easily implemented on any operating system like MS Windows, Linux, and Mac OS without installing any third-party software. Further, comparing Word documents functionality can be completed by consuming a couple of API calls of the document comparison library.

Code to Compare Word Documents using C#

By following the steps outlined above, we built a sample C# program that compares two Word documents for differences. You can easily expand this solution to handle any number of documents simply by calling the Add method of the Comparer class for each additional file. The same approach also works for a wide range of other formats—including PDF, DOC, XLSX, PPTX, VSDX, ODT, JPG, and many more—letting you perform quick, reliable comparisons across file types.