Duplicate File Finder is an easy to use and powerful software utility able to search and find empty or duplicate files in any folder. It automatically searches all files in all subdirectories. Duplicate files are based on byte for byte comparisons (100% accurate), for comparing large files you can select "Fast Searching" which compares the first and last 10 megabytes of large files, to increase speed (99% accurate).
This program is great for cleaning up disk space in your picture folders, or documents folders, or download folders. You can also specify to only search for jpg files or mp3 files, or any other type of specific file type.
Warning: do not delete files if you do not know what they are. It is NOT recommended that you search your system directory and delete all the duplicate files it contains; since your operating system may need those files.