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Most people do not realize how many duplicate files are on their computer, or how much space they take. Doppelganger finds them and helps you remove extras safely. It uses the same duplicate-finder engine as FolderMatch, refined by millions of users. In our testing it has been the fastest duplicate finder we have compared. You can view those results.
Please note: Keep backups of important files. Be careful when removing duplicates so you do not delete a copy you still need.