Local verification
Gen1Recomp ROM Checker
Confirm whether your 1 MiB US Pokemon Red, Blue, or Yellow backup matches the hashes currently expected by Gen1Recomp.
Your ROM stays on your device. Nothing is uploaded.The checker reads the file locally and uses Web Crypto to calculate SHA-1.
Choose or drop a ROM backup
Accepted file types: .gb and .gbc. The file is never logged, saved, or sent to a server.