diff-ext

diff-ext is a Windows Explorer shell extension that adds advanced file comparison commands to the right-click context menu. Easily compare two or more selected files with your preferred external diff tool (such as WinMerge, Beyond Compare, or KDiff3) directly from Explorer. The extension keeps track of your most recently compared files for fast re-selection (MRU list).

Installation requires administrator privileges.

Designed for developers, power users, and anyone needing fast, convenient file comparison on Windows 10 or 11.