MP3 to BRSTM Converter
Convert MP3 audio files to BRSTM format for Nintendo Wii games. Free online tool with visual loop point editor, multi-channel support. No download required.
Convert MP3 to BRSTM for Nintendo Wii Custom Music
Transform your MP3 music files into BRSTM format, the standard audio format used by Nintendo Wii games. With BGM Box, you can convert any MP3 song into a game-compatible BRSTM file in seconds — right in your browser.
BRSTM (Binary Revolution Stream) is the audio container format used by Nintendo Wii games. By converting your MP3 files to BRSTM, you can replace in-game music with your own custom soundtracks. Our tool handles the conversion entirely in your browser using WebAssembly — no uploads, no downloads of sketchy software.
Why Convert?
- Use your own music as background tracks in Wii games via USB Loader GX or Riivolution
- Create custom soundtracks for Super Smash Bros. Brawl mods like Project M / Project+
- Add custom music to Mario Kart Wii with CTGP Revolution or Wiimmfi
- Build custom BRSTM music packs for Dolphin Emulator
- Share your custom BGM creations with the Nintendo modding community
Supported Platforms
- Nintendo Wii (via USB Loader GX / Riivolution)
- Dolphin Emulator (Windows, Mac, Linux)
- Wii U (vWii mode)
- CTGP Revolution (Mario Kart Wii)
- Project M / Project+ (Super Smash Bros. Brawl)
How to Convert — 3 Easy Steps
Upload Your MP3 File
Drag and drop your MP3 file onto the upload area, or click to browse. The file is decoded locally in your browser.
Set Loop Points (Optional)
Enable looping to make your BGM play seamlessly in-game. Adjust the loop start and end sample positions using the number inputs.
Convert and Download
Click "Convert Now" and your BRSTM file will be ready in seconds. No sign-up, no waiting — download immediately.
BGM Box vs Traditional Tools
| Feature | BGM Box | Traditional Tools |
|---|---|---|
| Sign-up Required | No — use instantly | Often required |
| Installation | None — works in browser | Must download & install |
| Loop Point Editing | Visual waveform slider | Manual hex editing |
| Multi-format Support | BRSTM, BCSTM, BFSTM | Usually single format |
| Cost | 100% Free | Free but complex setup |
| Platform | Any device with a browser | Windows-only tools |
Supported Games
These games and emulators support custom BRSTM/BCSTM/BFSTM audio files:
Frequently Asked Questions
BRSTM is an audio file format used by Nintendo Wii games. It stores compressed or uncompressed audio with optional loop points, allowing game music to seamlessly loop during gameplay. It was developed by Nintendo as the standard audio container for Wii game discs.
Loop points define a range in the audio that repeats seamlessly. When playback reaches the loop end sample, it immediately jumps back to the loop start sample. This allows game music to play continuously without gaps or restarts. BGM Box provides a visual waveform slider for precise loop point editing.
Yes! Dolphin Emulator supports BRSTM files natively. Simply place your converted BRSTM files in the appropriate game directory (usually under User/Load/ or the game-specific folder), and Dolphin will use them as custom background music during gameplay.
Yes! BGM Box supports up to 8 channels. Multi-channel BRSTM files allow you to store multiple stereo tracks in a single file. This is commonly used in games with dynamic music systems that switch between different mixes depending on gameplay situations.
There is no hard limit, but very large files (>50MB) may take longer to process since everything runs in your browser. For best performance, we recommend files under 50MB.
No! All audio processing runs locally in your browser using WebAssembly technology. Your files never leave your computer. We value your privacy and security.