BRSTM Player — Listen to Nintendo Game Audio in Your Browser
Play BRSTM, BCSTM, BFSTM, ADX, HCA, FSB, and 100+ game audio formats in your browser with real-time FFT spectrum visualization.
Done listening? Convert your BRSTM to MP3 →
What is the BRSTM Player?
The BGM Box Online Player lets you play 100+ game audio formats directly in your browser — including BRSTM, BCSTM, BFSTM, ADX, HCA, FSB, WEM, and many more. Powered by vgmstream, the industry-standard game audio decoding engine. No downloads, no sign-ups — just drag, drop, and play.
Features
- Real-time FFT spectrum visualization with 40 frequency bands
- Automatic loop point detection and seamless looping
- Multi-track support for dynamic game music files
- CD-style rotation animation during playback
- Manual Loop toggle for custom looping control
- 100% browser-based — your files never leave your device
Supported Audio Formats
- BRSTM — Wii games (Mario Kart Wii, Super Smash Bros. Brawl)
- BCSTM — 3DS games (Animal Crossing: New Leaf, Pokémon)
- BFSTM — Wii U / Switch games (Mario Kart 8, Zelda: Breath of the Wild)
- ADX / HCA — CRI Middleware games (Persona, Yakuza, Sonic)
- FSB — FMOD games (Hollow Knight, Celeste, Undertale)
- WEM — Wwise games (Cyberpunk 2077, Elden Ring, Genshin Impact)
- XMA — Xbox 360 games (Halo, Forza, Gears of War)
How to Play BRSTM Files Online
- Drag and drop your file onto the player above
- Click the play button or CD icon to start playback
- Use the track button to switch between multi-channel audio tracks
- Watch the real-time FFT spectrum visualization
- Toggle Loop to enable seamless background music playback
Frequently Asked Questions
The BGM Box player supports BRSTM (Wii), BCSTM (3DS), BFSTM (Wii U/Switch), AST, MP3, WAV, and OGG files. Nintendo audio formats are decoded using WebAssembly for accurate playback with full loop support.
Yes! The player automatically detects and honors loop points embedded in BRSTM/BCSTM/BFSTM files. The audio will loop seamlessly just like it does in the original game.
The visualizer shows a real-time FFT (Fast Fourier Transform) frequency analysis of the audio. The left half shows the left channel and the right half shows the right channel, with lower frequencies at the center and higher frequencies at the edges.
Yes! Multi-channel BRSTM files often contain multiple stereo tracks. Use the "Track" button to cycle through available tracks.
No! All audio decoding and playback happens locally in your browser using WebAssembly. Your files are never uploaded anywhere.