4× / AVAILABLE NOW
Stem Splitter
Open up the mix. Separate vocals, drums, bass, and instruments into individual tracks.
4× / dedicated toolOne-time 172 MB model download
GUIDE / split music into stems online
What does stem splitter do?
Stem splitting predicts several sources that contributed to a finished mix. SoundTools processes overlapping 44.1 kHz stereo chunks through Demucs and rebuilds four continuous local WAV results.
FIELD NOTES / 01
A real local processor, not a decorative upload box
Demucs WebGPU runs after you choose a source and explicitly start the operation. The audio samples remain in browser memory; SoundTools does not send the selected media to an application endpoint.
Use a supported WebGPU desktop browser, load the model on demand, and keep the page open while all overlapping chunks are processed. Results remain available for preview and download only in the current tab. Closing or refreshing the page releases those temporary objects.
PROCESS / THREE STEPS
How to use stem splitter
- 01
Choose the local source
Open a compatible file in the dedicated workbench at the top of this page. The browser validates and decodes it without an upload step.
- 02
Set the useful controls
Use a supported WebGPU desktop browser, load the model on demand, and keep the page open while all overlapping chunks are processed.
- 03
Process, check, and export
Run the local processor, inspect the status and preview, then save Vocals · Drums · Bass · Other WAV when the result is ready.
SIGNAL NOTES / VERIFIED BEHAVIOR
What this tool actually does
Clear limits are part of a useful tool. These values describe the processor currently running in this page.
The work is executed in the page through browser workers, WebAssembly, Web Audio, or WebGPU as stated.
Runtime and model assets may be downloaded, but the selected file is not attached to those requests.
The dedicated workbench exposes only formats it can actually produce in the current browser.
USE CASES / 02
Useful reasons to open stem splitter
- Arrangement study
Hear the main source groups separately to understand a mix.
- Practice support
Mute or focus on one estimated part during rehearsal.
- Authorized remixing
Create local working stems for music you have permission to edit.
QUESTIONS / PRACTICAL ANSWERS
Questions about this tool
Answers based on the current browser processor—not promises about a future version.
01Is my audio uploaded for processing?
No. Audio samples stay in browser memory. The page may download a codec or model asset, but it does not send the selected file with that request.
02Why can the first run take longer?
This tool uses Demucs WebGPU. A browser may need to download and initialize that runtime before the first operation; later runs can reuse cached assets.
03Can I preview the result before saving?
Yes. Audio-producing tools expose local result players, while analysis and transcription tools show their detected data before download.
04What happens when the browser is unsupported?
The workbench reports the missing capability instead of uploading the media or pretending that processing is still running.