rom-weaver is a free, open-source tool for patching, converting, and bundling ROMs and disc images. Its browser and command-line versions share an engine. It can apply patches, create them from ROMs, and assemble ordered patch workflows into reusable bundles; supported formats include IPS, IPS32, BPS, UPS, xdelta, PPF, and others, with some format-specific limits. It can probe and extract many archive and compressed image formats, including ZIP, 7z, RAR, CHD, RVZ, and Z3DS, though creation support varies. Supported cheat codes can be added to ROMs, or selected database cheats saved as patch files; runtime-memory cheats are unsupported. Save editing covers specified Pokémon save layouts and The Legend of Zelda: A Link to the Past SRAM, subject to game recognition limits. The browser uses on-device WebAssembly processing, and the CLI reads and writes local paths. The maker says files and results are not uploaded. The browser app can work offline after caching. It is available for Linux, macOS, Windows, web, and self-hosting, with no account required.
Who it is for
rom-weaver suits people working with ROMs or disc images who need patching, conversion, or reusable patch workflows. It is available through a browser or CLI, including self-hosted deployment.
What is good
- Browser and CLI share the same engine.
- Supports batch patching and checksum verification.
- Keeps an original backup.
- No account is required.
- Browser can work offline after caching.
What to know first
- Some patch formats have specific limits.
- Archive creation support varies by format.
- Runtime-memory cheats are unsupported.
- Save editing has game recognition limits.
Verdict
rom-weaver offers a broad set of patching and file-handling workflows with local browser and CLI processing. Check format-specific limits and save-game recognition before relying on a particular workflow.
rom-weaver plans and pricing
All plansCompared on ROM patching software
- Free plan
- Yes
- Patch formats
- IPS, IPS32, SOLID, BPS, UPS, VCDIFF, xdelta, GDIFF, HDiffPatch/HPatchZ, APS, APSGBA, RUP, PPF, PAT, EBP, BDF/BSDIFF40, BSP, MOD, DLDI, DPS, DCP
- Supported platforms
- cross_platform
- Batch patching
- Yes
- Checksum verification
- Yes
- Original backup
- Yes
- Command-line support
- Yes
