patch applier — free browser tool | fatcousin

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apply ips · bps patches to a base rom · for retro game modding and translation patches · checksum validation · runs locally

source rom

Drop the base ROM

.nes .sfc .smc .gb .gbc .gba .z64 .md

Select file

patch file

Drop the patch

.ips .bps

Select file

options

skip CRC verification (apply even if source doesn't match)

status

drop a source rom and a patch file

apply

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.