rom-weaver

Set up the browser app

Set preferences, enable beta tools, and prepare offline assets in Settings.

Change preferences

Open Settings from navigation, or Menu → Settings at the bottom-right on a phone. Change preferences, then select Save.

Settings covers language, byte units, output defaults, compression, and the practice-run links. Show practice-run links adds links such as Patch a practice ROM below empty drop zones for practice runs. Advanced exposes worker threads, codecs, and RVZ block size. Keep automatic thread selection unless limiting resources.

On phones, leave Settings with bottom-right Close, a right swipe from the left edge, or the browser's back gesture.

Navigation’s separate Theme (light, dark, or system) and Accent (highlight color) controls apply immediately, as do the Theme and Accent choices inside the Settings dialog. Optional ROM databases download or delete immediately, and Advanced changes persist as you make them. Every other setting waits for Save.

Enable beta tools

  1. Open Settings.
  2. Select Enable beta tools (Save Editor).
  3. Select Save.
  4. Open the required tool from the app's navigation.

Only Save Editor requires this setting; Trim, PPF Undo, and cheats in Apply, Create, and Identify do not.

Prepare for offline use

  1. While online, open Settings, select Keep an offline copy, then Save.
  2. Wait for the app's offline download to finish.
  3. Reopen Settings and select the Optional ROM databases you need. These choices download immediately.

Offline active confirms the app, every emulator core, and the Optional ROM databases you selected are cached. Keep ROMs and patches locally. Browser-menu installation does not verify these resources.

Before relying on offline use, disconnect, reopen rom-weaver, and run a small local job.

Remote weaves need network access unless their files are local. Browser storage eviction can remove cached assets.

Offline behavior explains these limits. Test a ROM covers emulator controls.

Back up saves and manage storage

Before clearing site data, export emulator saves.

Inspect saves in Saves & storage; enable Advanced to include working files. Clear an Optional ROM databases selection in Settings to remove that group's cached data.

Remove only unneeded data: browser site-data controls can erase the entire app cache.

See Privacy for stored data and Webapp status for version/offline labels.