ComponentSoftware Diff (CSDiff) is a free, advanced file-difference analysis tool for Microsoft Windows. CSDiff is a great asset to anyone in need of analyzing changes which have been made between two revisions of the same file or folder. CSDiff is commonly used when analyzing program source files, HTML documents and MS-Word documents.
ComponentSoftware HTMLDiff (CS-HTMLDiff) is an advanced file-difference analysis tool for Microsoft Windows which analyzes & presents differences in HTML, XML, MS-Word and text documents.
Changes to HTML files may be viewed visually as they appear in your browser, or you can analyze the changes at source level.
CS-HTMLDiff even lets you compare online documents !!