NRO Studio

A private, browser-based editor for Nintendo Switch homebrew .nro files. Change an app's embedded icon, name, author, and display version, then download a rebuilt NRO without uploading it to a server.

Live site: https://mikey820.github.io/nro-patcher/

• The JPEG icon in the NRO ASET section
• Name and author in every populated NACP language entry
• NACP display version
• ASET's 64-bit icon size and shifted NACP/RomFS offsets

The executable portion of the NRO is copied byte-for-byte and its declared size is never changed.

The site has no build step or runtime dependencies:

python3 -m http.server 8000

Open http://localhost:8000. Run the binary fixture tests on macOS with:

/System/Library/Frameworks/JavaScriptCore.framework/Versions/A/Helpers/jsc -m tests/nro.test.mjs

Pushes to main deploy the repository through the GitHub Pages Actions workflow.

MIT