HexDiff is a compare tool for binary and/or text data files. The comparison can be done on both a pair of files and a pair of directories. User can view the file and get all of the file's modification information by this software. In comparing window, any change on the file will be marked with green or red in the vertical scroll bar and user can move to the changed spot quickly by hot keys. This new version of HexDiff 4.0 includes a new UI interface and a pair of shell browsers. The new fashion user interface is easy to use and user friendly. With the two shell browsers, user can select the compare targets much easier.