GroupDocs.Comparison allows you to detect changes between source and target documents and get changes coordinates at document preview images. These coordinates can be useful to highlight changes at the document preview images.
To get the changes coordinates, follow these steps:
Instantiate the Comparer object. Specify the source document path or stream.
Call the Add method. Specify the target document path or stream.
Set the CalculateCoordinatesMode to CalculateCoordinatesModeEnumeration.Source or CalculateCoordinatesModeEnumeration.Target if you want to get coordinates from source or target document.