Find Duplicate Images
Find exact copies and the same picture saved at another size or in another format.
Drop a folder of photos
Finds exact copies and the same picture saved in another size or format. Nothing is deleted.
About this tool
Drop a folder of photos. Interformat fingerprints every image twice: a SHA-256 checksum finds byte-for-byte copies, and a perceptual hash finds the same picture even after resizing, re-compressing or converting.
Pick which copy to keep in each group (the largest is chosen by default), then download the set without duplicates or a CSV list to clean up with.
It never deletes anything from your disk.