The [GroupDocs.Comparison for .NET][1] is a C# library which allows you to compare documents and find differences. Compare and merge Microsoft Word, Excel, PowerPoint, OpenDocument, PDF, Text, HTML and [many other documents][2], retrieve a list of changes between source and target document(s), apply or reject changes and save results with GroupDocs.Comparison API. In addition to this, GroupDocs.Comparison can identify styling and formatting changes - like bold, italic, underlines, strikethroughs, font types, etc.