a program that allows you to visually compare text files in order to find differences in them.

Winmerge

WinMerge is a program that allows you to visually compare text files in order to find differences in them. It will easily help determine what has changed between the versions of the project, and then, if necessary, to fusion of these changes.
WinMerge has Unicode support, flexible syntax illumination, and can be integrated into the Windows shell. The functionality of the program can be expanded by connecting additional plugins. (9.3 mb, free, Russian language: yes)

download WinMerge 2.16.42 64-bit | 32-bit | portable