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rom-weaver

B
B tier on ROM Patching SoftwareScore 7.2 · #3 of 20
Android app
Not listed
Free plan
Yes
Runs on
Linux, Mac, self-hosted, Web, Windows
rom-weaver.com
The rom-weaver homepage
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Summary

rom-weaver is a free, open-source tool for patching and converting ROMs and disc images, as well as assembling patch workflows into reusable bundles. Its browser and command-line editions use the same engine. You can apply patches, generate patches from ROMs, and order multiple patch steps into a bundle. Supported formats include IPS, IPS32, BPS, UPS, xdelta, PPF, and others, with some limits depending on format. The tool can inspect and extract a range of archives and compressed image types, including ZIP, 7z, RAR, CHD, RVZ, and Z3DS; creating these formats is not uniformly supported. It can bake supported cheat codes into ROMs or save selected database cheats as patch files, but runtime-memory cheats are unsupported. Save editing covers specified Pokémon save layouts and The Legend of Zelda: A Link to the Past SRAM, with recognition limits by game. Browser files are processed locally with WebAssembly, and the CLI uses local paths; the maker says files and results are not uploaded. The browser app can work offline once cached. No account is required.

Who it is for

It suits users who need to patch, convert, or bundle ROM and disc-image workflows on a computer or in a browser. It may also suit users who prefer local file processing or want to self-host the browser app.

What is good

  • Free and open source; no account required
  • Browser and CLI share the same engine
  • Supports many patch formats
  • Browser processing uses WebAssembly on-device
  • Can work offline after the app is cached

What to know first

  • Runtime-memory cheats are unsupported
  • Archive and image creation support varies
  • Save recognition has game-specific limits
  • Remote workflow sources must allow the app origin through CORS

Verdict

rom-weaver covers patching, conversion, and reusable workflows across browser and CLI versions. Review format-specific limits and supported save layouts before relying on it for a particular file or game.

rom-weaver plans and pricing

All plans
Free and open-source Free No account required · browser and command-line versions rom-weaver.com · 29 Sept 2026

Compared on ROM patching software

Free plan
Yesrom-weaver.com
Patch formats
IPS, IPS32, SOLID, BPS, UPS, VCDIFF, xdelta, GDIFF, HDiffPatch/HPatchZ, APS, APSGBA, RUP, PPF, PAT, EBP, BDF/BSDIFF40, BSP, MOD, DLDI, DPS, DCProm-weaver.com
Supported platforms
cross_platformrom-weaver.com
Batch patching
Yesrom-weaver.com
Checksum verification
Yesrom-weaver.com
Original backup
Yesrom-weaver.com
Command-line support
Yesrom-weaver.com

Facts

Purpose
rom-weaver patches, converts, and bundles ROMs and disc images using the same engine in its browser and command-line versions.rom-weaver.com · 29 Sept 2026
Patch workflows
It can apply patches, create patches from ROMs, and package ordered patch workflows as reusable bundles.rom-weaver.com · 29 Sept 2026
Supported patch formats
The support matrix lists formats including IPS, IPS32, BPS, UPS, xdelta, PPF, and others for applying or creating patches, with some format-specific limits.rom-weaver.com · 29 Sept 2026
File conversion
It supports probing and extracting many archive and compressed image formats, including ZIP, 7z, RAR, CHD, RVZ, and Z3DS; creation support varies by format.rom-weaver.com · 29 Sept 2026
Cheats
Users can bake supported ROM cheat codes into ROMs or save selected database cheats as patch files; runtime-memory cheats are marked unsupported.rom-weaver.com · 29 Sept 2026
Save editing
The Save Editor supports specified Pokémon save layouts and The Legend of Zelda: A Link to the Past SRAM, with recognition limits listed by game.rom-weaver.com · 29 Sept 2026
Local processing
The browser processes files with WebAssembly on the device, and the CLI reads and writes local paths; the maker says ROMs, patches, and results are not uploaded to its server.rom-weaver.com · 29 Sept 2026
Privacy details
The webapp says it has no analytics, advertising, or tracking scripts and sets no advertising or tracking cookies; it stores app data in browser storage.rom-weaver.com · 29 Sept 2026
Offline use
The maker says the browser app works offline after it has cached the app.rom-weaver.com · 29 Sept 2026
Integration
Hosts can preload browser workflows with bundle, ROM, and patch URLs or ingest files from same-origin OPFS storage; remote sources must allow the app origin through CORS.rom-weaver.com · 29 Sept 2026
Self-hosting
The webapp is a static app that can be self-hosted from a Docker image or static files, and requires HTTPS outside localhost.rom-weaver.com · 29 Sept 2026
CLI platforms
The CLI provides release binaries for macOS, Linux, and Windows, with architecture variants listed on its install page.rom-weaver.com · 29 Sept 2026
Support
The maker directs bugs, format requests, and questions to the GitHub issue tracker and says security reports have a separate process.rom-weaver.com · 29 Sept 2026
License and maker
The project is written by Brandon Casey and contributors and is licensed under GNU AGPL v3.0 or later.rom-weaver.com · 29 Sept 2026

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