Unless you have a perfect memory or keep a well-organized list of your songs, you will end up with at least one duplicate file in your library. Finding duplicate files by listening to your entire music library is impractical. Duplicate file finders are great to use in this situation to clean up your music collection and reclaim lost hard drive space.

AllDup packs an impressive set of features for a free duplicate file finder. It seems to have options that are only seen in the premium versions of similar tools.

Some of the better features include the ability to search multiple folders or hard drives at once and compare files from all sources or just within the same folder. This level of precision sets it apart from other duplicate file finders.

In addition, AllDup can compare files byte by byte, as well as by file attributes and other normal criteria (such as name, extension, and size). Furthermore, it is possible to scan inside RAR and ZIP files, explicitly include or exclude file types and folders, and preview the music without leaving the software.