Convert MP3 to BRSTM online for Wii music mods like Mario Kart Wii and Super Smash Bros. Brawl. Upload files up to 20GB and download the converted result in a few clicks.
Convert BRSTM to MP3Drag & Drop your MP3 file here
MP3 files, up to 20GB
Files stay private.
Automatically deleted after 24 hours.
Link
20GB upload limit.
4.8/5
Trusted for 1,827,796+ conversions
HOW IT WORKS
Three steps, no account, nothing to install.
01
Upload your MP3 file
Drag and drop an .mp3 file or select it from your device. Cover art and ID3 tags don't need to be removed first.
02
Convert to BRSTM
Keep BRSTM as the output format and start. The MP3 is decoded, its encoder padding is trimmed when it has a LAME or Xing header, and the audio is encoded as 4-bit DSP-ADPCM.
03
Download the BRSTM
Download one .brstm file per MP3 and play it in vgmstream or a player built on it.
MP3
MP3 is a lossy compressed audio format built for small files and broad playback compatibility. It works on almost every phone, browser, car stereo, media player, and editing application.
BRSTM
BRSTM is the Nintendo Wii's streamed audio format (RSTM), used for background music in games such as Mario Kart Wii and Super Smash Bros. Brawl. It usually holds 4-bit DSP-ADPCM audio, can store a loop and can group channels into several tracks. Music modders and vgmstream-based players use it.
FILE FORMATS
SOURCE
MPEG-1 Audio Layer III has been the universal music format since the 1990s. It compresses audio by removing sounds the ear is unlikely to hear, so a song takes a few megabytes instead of tens. ID3 tags carry the title, artist and album art, and every phone, browser, car stereo and editor plays it.
TARGET
BRSTM is the Wii's streamed music format, holding DSP-ADPCM or PCM audio with loop points so a track repeats without a gap. Mario Kart Wii, Super Smash Bros. Brawl and many other Wii games use it, and custom music mods replace game tracks with new BRSTM files.
| Feature | MP3 | BRSTM |
|---|---|---|
| Developed by | MPEG (Fraunhofer) | Nintendo |
| File extension | .mp3 | .brstm |
| Compression | Lossy | DSP-ADPCM or PCM |
| Size vs uncompressed WAV | About 1/7 to 1/10 | About 1/4 (ADPCM) |
| Tags and cover art | ID3 tags and cover art | Loop points, no tags |
| Best for | Music and podcasts everywhere | Wii game music and mods |
| Plays on phones and browsers | Yes | No, needs vgmstream |
USE CASES
Practical workflows where MP3 to BRSTM conversion is useful.
Try a song in a Wii mod before looping it
Hear how a song sounds as a BRSTM in your mod before you set loop points in a WAV for the final version.
Replace a fanfare or results jingle
Pieces that play once, such as a fanfare or a results jingle stored as a stream, don't need loop points, so an MP3 is enough.
Replace credits or ending music
Songs that play through once, such as credits or ending themes, convert straight from MP3.
Keep a sting starting on cue
When the MP3 has a LAME or Xing header, the encoder's silence at the start and end is removed, so a short sting starts right away.
Convert a long medley
Tracks up to 30 minutes convert. A 3-minute song takes about 4 seconds and a 10-minute medley about 12 seconds.
Make a mono BRSTM from a voice clip
A mono MP3, such as narration or a voice clip, stays mono in the BRSTM instead of being doubled to stereo.
Convert tagged MP3s from a music library
MP3s with cover art, ID3 or APE tags convert without cleanup. The tags and artwork are dropped, since the BRSTM holds only audio.
Add sound to a Wii homebrew project
Homebrew developers can turn MP3 music and sound effects into BRSTM streams for a Wii homebrew game or app, where each one plays once.
Make BRSTM test files for tools
Authors of BRSTM players and parsers can make mono and stereo test streams from everyday MP3s.
Convert a pack of jingles in one go
Add a set of jingles or sound effects to one job and download the BRSTM files together as a ZIP.
SUPPORTED FILES
MP3 files up to 30 minutes long are supported.
Mario Kart Wii, Brawl and other Wii custom music.
Channels are kept.
The BRSTM keeps the MP3's rate.
Longer audio is refused.
MP3 has no loop points. Use WAV to BRSTM with a looped WAV.
Only convert audio you own or have permission to use. Having a file doesn't automatically give you the right to put it into someone else's game.
TROUBLESHOOTING
Most problems come down to settings the game expects, not the conversion itself.
01
MP3 has no loop points, so the BRSTM plays once. Use our WAV to BRSTM converter with loop points in the WAV's smpl chunk.
02
The game probably expects a different sample rate. Check an original file from the game and match its rate before converting.
03
Some games limit stream size. Shorten the track or lower its sample rate.
04
MP3 and DSP-ADPCM are both lossy. Start from a WAV for better results.
05
Compare your track's loudness with the game's other audio and adjust it before converting.
06
Make sure the new file uses the exact name and folder of the one it replaces, then test it in the actual game or build.
VGAudio, LoopingAudioConverter and BrawlCrate encode Nintendo and CRI formats once installed. dragdropdo runs VGAudio in the browser, so you can turn MP3 into BRSTM on any device.
| What matters | dragdropdo | VGAudio and Desktop Tools |
|---|---|---|
| Nothing to install | ✓Yes. Runs in any modern browser. | ~Yes. Windows tools or the .NET command line. |
| Works on phones and tablets | ✓Yes. Desktop, Android, iPhone and iPad. | ~No. Desktop only. |
| Batch conversion | ✓Yes. Add many files and download one ZIP. | ~Yes, with LoopingAudioConverter or scripts. |
| Share finished files | ✓Yes. Send a unique link from the result page. | ~You upload and share the files yourself. |
| Pricing | ✓Free with daily limits. $2.99 or $6.99 passes for unlimited use, no monthly plan. | ~Free. |
| Setting loop points | ✓Read from a WAV's smpl chunk. MP3 sources play once. | ~Yes. Most let you type loop points directly. |
Other tools use different pricing, limits and workflows. This comparison describes dragdropdo's own features without assuming every other tool works the same way.
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WHY DRAGDROPDO
Convert MP3 to BRSTM in your browser, with nothing to install and nothing kept after 24 hours.
Private by default
Files are encrypted in transit and deleted from our servers automatically after 24 hours.
No install required
Convert in any modern browser on Windows, Mac, Linux, Android, iPhone or iPad. No app and no sign-up wall.
Big files and batches
Upload files up to 20GB each, add several at once, and download the results one by one or as a ZIP.
Share & download
Save finished files to your device or pass them on with a share link from the result page.
MORE MP3 TOOLS
MP3 is a popular audio file format known for its efficient data compression and relatively high quality, making it ideal for music and audio streaming. Widely used for music downloads and digital media, MP3 files maintain a balance between sound quality and file size, ensuring quick downloads and easy sharing across platforms and devices.
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FAQ
Answers to common questions about dragdropdo's MP3 to BRSTM converter.
