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WinMerge is an Open Source differencing and merging tool for Windows. It can compare both folders and files, presenting differences in a visual text format that is easy to understand and handle. WinMerge is highly useful for determining what has changed between project versions, and then merging changes between versions. It can be used as an external differencing/merging tool or as a standalone application. File compare window is basically two files opened to editor into two horizontal panes. Editing allows user to easily do small changes without need to open files to other editor or development environment. Many times it is useful to see exact differences inside lines. WinMerge can highlight different areas between lines.