Convert Nintendo 3DS BCSTM streams to uncompressed WAV at the original sample rate. Upload files up to 20GB and download the converted result in a few clicks.
Convert WAV to BCSTMDrag & Drop your BCSTM file here
BCSTM files, up to 20GB
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Automatically deleted after 24 hours.
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20GB upload limit.
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HOW IT WORKS
Three steps, no account, nothing to install.
01
Upload your BCSTM file
Drag and drop a .bcstm music stream extracted from a 3DS game or theme, or select it from your device.
02
Convert to WAV
Keep WAV as the output format and start. The DSP-ADPCM or PCM audio is decoded to uncompressed 16-bit PCM.
03
Download the WAV
Download one WAV per BCSTM file. It opens in Audacity, any DAW and common media players.
BCSTM
BCSTM is the NintendoWare music stream format of Nintendo 3DS games, such as The Legend of Zelda: Majora's Mask 3D. It holds DSP-ADPCM or PCM audio, often with a loop point so the music can repeat during play. 3DS home menu themes also store their background music as a BCSTM.
WAV
WAV is a RIFF-based audio format commonly used for uncompressed PCM audio. It is easy to edit and broadly supported in recording, broadcast, and desktop audio workflows.
FILE FORMATS
SOURCE
BCSTM is the music stream format of Nintendo 3DS games and themes. Most use Nintendo's DSP-ADPCM codec at about a quarter of PCM size, some use PCM16, and many hold several stereo tracks the game mixes live. Loop points make the music repeat without a gap, often at the 3DS-native rate of 32728 Hz.
TARGET
Microsoft and IBM defined WAV in 1991. It normally stores plain PCM audio with no compression, which is why editors, DAWs, broadcast systems and speech tools accept it without question. The price is size: CD-quality stereo takes about 10 MB per minute, and tagging support is limited.
| Feature | BCSTM | WAV |
|---|---|---|
| Developed by | Nintendo | Microsoft and IBM |
| File extension | .bcstm | .wav |
| Compression | DSP-ADPCM or PCM | None (PCM) |
| Size vs uncompressed WAV | About 1/4 (ADPCM) | Same size (1:1) |
| Tags and cover art | Loop points, no tags | Basic text tags, no cover art |
| Best for | 3DS game music and themes | Editing, mastering, speech tools |
| Plays on phones and browsers | No, needs vgmstream | Yes |
USE CASES
Practical workflows where BCSTM to WAV conversion is useful.
Edit 3DS music in a DAW
Open the WAV in Audacity, Reaper, FL Studio or Ableton Live to cut, remix or master a 3DS track.
Keep the 3DS sample rate
The WAV keeps the 3DS-native 32728 Hz rate, so the audio is not resampled on the way out.
Split the layers of a multi-track song
A multi-track BCSTM becomes one WAV with every track kept as its own channel pair. Split the channels in an editor to hear or reuse each layer on its own.
Make an extended loop
Inner-loop tracks come out as the intro, two loop passes and a 10 second fade. Cut and repeat the loop in an editor to make a longer version.
Rework music for a 3DS theme or mod
Decode an existing BCSTM, edit it, then re-encode it with your usual BCSTM tool. The WAV has no loop points, so set them again when you re-encode.
Archive a 3DS soundtrack
Keep decoded WAV copies of a 3DS soundtrack that open on any computer, without game-specific tools.
Sample game music for production
Producers can sample 3DS music in WAV, which every sampler and DAW accepts.
Encode to another format yourself
Start from the WAV when you want to make a FLAC, AAC or OGG file with your own encoder.
Learn a melody by ear
Musicians can slow the WAV down in Audacity or Transcribe to learn a 3DS melody or write it out as sheet music.
Use music in a video edit
Video editors get a WAV that imports cleanly into Premiere Pro, DaVinci Resolve or Final Cut Pro.
SUPPORTED FILES
BCSTM streams from Nintendo 3DS games and themes are supported.
Decoded with vgmstream's reference decoder.
Come out bit-exact.
Each stereo track is kept as a channel pair in a 4 or 6-channel WAV.
The 3DS-native rate is kept in the WAV.
Upload many files and download the WAVs as a ZIP.
Only convert audio from games you own or have permission to use.
TROUBLESHOOTING
Game audio works differently from normal music files, which explains most surprises.
01
Looping game music is rendered the way the game plays it: the looped section plays once more, then fades out over 10 seconds. A loop covering the whole track plays once.
02
A file holding less than 97% of the audio its header describes was cut off while extracting or downloading. Upload the complete file.
03
The file is damaged, isn't really BCSTM audio, or was extracted with the wrong tool. Extract it again from the game files and retry.
04
WAV is uncompressed, about 10 MB per minute for 44.1 kHz stereo and more for higher rates or extra channels.
05
Multi-track WAVs have no speaker layout, so players treat 4 channels as quad and 6 as 5.1. Split the pairs in an editor.
06
Some apps don't accept 32728 Hz. Resample to 44.1 or 48 kHz in an editor.
vgmstream is the reference decoder for game audio, used through foobar2000 or the command line. dragdropdo runs the same decoder in the browser, so you can turn BCSTM into WAV on any device.
| What matters | dragdropdo | vgmstream and Desktop Tools |
|---|---|---|
| Nothing to install | ✓Yes. Runs in any modern browser. | ~foobar2000 plus the vgmstream plugin, or vgmstream-cli. |
| Works on phones and tablets | ✓Yes. Desktop, Android, iPhone and iPad. | ~No. Windows and command-line tools. |
| Batch conversion | ✓Yes. Add many files and download one ZIP. | ~Yes, with scripts or foobar2000's converter. |
| 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. |
| Choosing loop count and fade | ✓Fixed: an inner loop plays twice, then fades over 10 seconds. | ~Yes. vgmstream-cli sets the loop count and fade length. |
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 BCSTM to WAV 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 BCSTM TOOLS
BCSTM is the NintendoWare streamed audio format (CSTM) used for background music in Nintendo 3DS games and for the music of 3DS HOME Menu themes. It usually holds 4-bit DSP-ADPCM audio, sometimes PCM, and can store a loop point.
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FAQ
Answers to common questions about dragdropdo's BCSTM to WAV converter.
