You can compare text from inside Microsoft Word and Excel using our Office add-in called "Compare Text With Selection Diff Tool". It uses the same powerful text difference algorithm as our desktop application Florencesoft TextDiff, although it is more limited in its user-selectable options. The Office add-in has more constrained results windows as it runs inside Microsoft Word and Excel.
This Microsoft Office add-in can be obtained from Microsoft using the web page https://appsource.microsoft.com/en-us/product/office/WA103863850
Our desktop application Florencesoft TextDiff, which is available for download on this website, will also compare the text parts of Microsoft Word documents. It will not compare graphics or tables though. Florencesoft TextDiff is a desktop application, which runs outside of Microsoft Word. TextDiff can compare whole folders (directories) of text (.txt), Rich Text Format (.rtf) and Microsoft Office Word files (both .doc and .docx) against each other, just like the older Windows application WinDiff.
Our other software application Florencesoft DiffEngineX is a full-featured compare tool for Microsoft Excel spreadsheet xlsx and xls files and is available from our other website https://www.florencesoft.com
Note the Office add-in "Compare Text With Selection Diff Tool" will compare large blocks of text inside Microsoft Excel and report the individual word and character differences. DiffEngineX compares all the cells for differences and reports differences as a list of differing cells. DiffEngineX has an option to hide matching Excel rows, which is a powerful way to see all the differences at once.
Screenshots Of The Microsoft Office Add-In Compare Text With Selection Diff Tool: