binary diff — free browser tool | fatcousin

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compare two binary files byte by byte · visual change map · changed region list · runs locally

original file

drop the original file

unmodified ROM or binary

Select file

modified file

drop the modified file

patched ROM or modified binary

Select file

status

drop original file, then modified file

compare

notice

you supply your own files. fatcousin does not host, link to, or recommend sources for rom files, bios files, or copyrighted game data. this tool is for preservation, modding, research, and education with files you lawfully possess. all processing runs in your browser — files never leave your device.