BPS Super Mario Bros. 2 Patcher vs EZ ROM Patcher

BPS Super Mario Bros. 2 Patcher is a free web page for applying a BPS patch to a Super Mario Bros. 2 ROM. It provides separate upload controls for an SMB2 ROM and a BPS patch, then an Apply patch button. The page validates both files and shows invalid-file messages when they are rejected. It supports only the NTSC version; the page says an invalid ROM may be a bad dump or the wrong region. During validation, the code checks iNES 1.0 and iNES 2.0 headers and can swap them as needed. It recognizes ROM and patch checksums for revisions 0 and A, and can apply a revision conversion patch. After patching, the script saves a .nes file named from the patch filename. The project links to GitHub source code containing BPS handling, ROM and hash code, revision patches, scripts and styles. The page credits Marc Robledo for Rom patcher JS.

EZ ROM Patcher is a free browser tool for applying patch files to game ROMs, producing modified games such as fan translations, ROM hacks, bug fixes, and restoration patches. The maker says patching runs on the user’s device and that ROMs and patches are not transmitted to a server. It supports IPS, BPS, UPS, APS, RUP, PPF, BSDiff, xdelta/VCDIFF, EBP, and Star Rod .mod patches. A patch creator compares an original ROM with an edited copy and can create IPS, BPS, UPS, APS, RUP, PPF, and EBP patches. A separate checksum tool calculates CRC32, MD5, and SHA-1 hashes and compares them with entered values or .sfv, .md5, and .sha1 files. ZIP archives can be unpacked, with a choice of patch when an archive contains several; RAR and 7z archives must be extracted first. The site says it works in mobile Safari and Chrome, although large disc images may exceed a phone browser’s available memory. Some patch formats include checksums the tool checks, while IPS, PPF, xdelta, and BSDiff do not record one. No account is required, and users supply their own ROM files.