As a developer, sometimes there are situation that you have updated the wrong version of a program. To incorporate the changes you have made on the earlier version to the correct version, you have to compare the two and insert the difference to the correct program file. Doing it manually is a tedious task specially if you have already modified a lot of codes. To make it easier and automatic KDiff3 is here to help. KDiff3 is a free program that allows you to compare and merge difference of two or three text source files. It shows the difference line by line and character by character. Its usage is simple, just launch the application to specify files or folders (not more than 3) which you want to compare and merge. When your done setting the options, click OK to view the changes.
KDiff3 opens each file in separate window. Same color indicates no changes otherwise it indicates code difference. If you want to automatically merge the files, you can do so under Merge menu where there are multiple ways in which files can be merged together. You can also configure several options of the application such as color, font, comparison and merge settings and etc.
KDiff3 works on Windows XP, Vista and Windows 7. I tested it under Windows Vista.
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