I also have a rather large amount of images on my pc, could well be over 30000 and I always had the impression that there have to be duplicates all over the place. Never had the time to manually check them and delete the duplicates, would take forever.

Therefor I decided to take a look at tools that compare and delete duplicate files automatically. I found two that suit my needs, one is more of a general duplicate finder and one is specifically for images.

Clonespy is able to locate duplicate files even if they have a different file name or size. Its freeware of course, simply unzip to a location and run the file. The program gives you some options how to handle the duplicate files, move them, delete them and exporting a list of the files without removing any.

The second tool which is unfortunately nagware is called Unique Filer. I have not found a freeware tool that is able to perform the same operations as Unique Filer. It is able to find images dupes even if the images have been resized, rescaled, resampled and color corrected. It also finds normal dupes of course, but that’s not what makes it so special.

If you have many images that you downloaded over the years I recommend Unique Filer to you, you can use all its functions without registering, but see a nagscreen all 10 files that you opt to delete. And those are a lot, from my 30000 files more than 5000 have been dupes..