BPS Super Mario Bros. 2 Patcher vs Delta 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.

Delta Patcher is a free desktop application for creating and applying xdelta patches to files on Linux, macOS, and Windows. Create mode records the differences between an original and modified file in a new patch. Apply mode takes the original file expected by that patch and its matching .xdelta file to produce a patched output. The application includes the xdelta3 engine, so a separate command-line installation is not needed. Checksum validation can flag a source file that does not match, and users may preserve a backup of the original. Creation settings include compression level, secondary compression, source window, checksum, and an optional description. Version 3.1.5 added support for files larger than 4 GB. Delta Patcher is open source under GPL-2.0. Downloads are ZIP archives hosted on GitHub, with no separate installer. The project directs users to GitHub for issues, discussions, source code, and releases.