Programmers have used diff utilities for years. In brief: A diff utility lets you input two files, then the program calculates exactly where the files contain changes. Diffing is the basis of such ...

Want to compare two identical documents and find out the differences between them? Use these free online document comparison tools. These online services enable you to check for changes made between ...

Editor’s note: The following review is part of Macworld’s GemFest 2012 series. Every weekday from mid June through mid August, the Macworld staff will use the Mac Gems blog to briefly cover a favorite ...