GroupDocs.Comparison allows you to detect differences between source and target files for changes at paragraphs, words, and characters levels. It can identify styling and formatting changes like bold, italic, underlines, strike-throughs, font types, etc. See Compare documents for a working example.
GroupDocs.Comparison allows obtaining basic information about source documents - file type, size, page count, etc. For example, you can use this to generate previews of compared documents. See Get file info.
Comparison summary report
Once the comparison process is complete, you can save a differences summary report that lists all changes in compared documents. See Get extended information on the summary page.