@picofarad@noauthority.social CCleaner, the old windoze crap cleaner has a dedupe file feature hidden in its menus. That should help you out. I saved MS's old FCIV.exe which can create MD5 & SHA1 checksums of whole dirs to a file or validate those dirs/files against said checksum file. Easy to use for deduping from. In Linux you can run a recursive find running a checksum cmd to a file & sort it to find dupes. Same images in diff formats will need eyeballing though.