California craftMusic gear & services

Beta / Tool reference

Sattari Stem Separator: Formats, Privacy & Limits

Extract vocals, drums, bass and other instruments from one track or a batch, then preview and download your chosen parts.

Open Sattari Stem Separator
Sattari Stem Separator running in a web browser
Actual completed HTDemucs separation of the original Sattari synthetic demo into bass and drums. The audio below is the real output from this run, not hand-isolated source tracks.
Input
WAV, MP3, FLAC, M4A, AAC and OGG when the browser can decode the codec. Mono or stereo files only; no streaming links or DRM-protected audio.
Output
44.1 kHz, 32-bit float stereo WAV. Individual stems, per-track ZIP and batch ZIP. Instruments is the other source, excluding vocals, drums and bass.
Limits
20 tracks; 100 MiB per file; 300 MiB total source files; 10 minutes per track; 512 MiB of retained outputs. The queue processes sequentially.
Browser
Requires JavaScript, Web Audio, Web Workers and WebAssembly. Desktop recommended. WebGPU is attempted with CPU fallback during initialization; acceleration and speed depend on hardware.
Privacy
Source audio is not uploaded. An approximately 172 MiB model is downloaded from Hugging Face on first use and cached when available. The model host receives a normal download request, not your song.
Price
The current browser tool is free to use, with no sign-in or payment step. Your own internet and device costs still apply.
Storage
Results are temporary for this page session. Download before leaving or reloading. Model caching does not save your finished stems.
Limitations
AI estimates may contain bleed and artifacts. All four sources are computed even when fewer outputs are selected. This is not recovery of the original studio multitracks.

Try the same audio

An original eight-second synthesized A minor groove at 120 BPM: bass, chords and percussion, with no vocals. Free to download and use for practice. This is a workflow demonstration, not a commercial-song benchmark.

Download demo WAV
  1. Download the original eight-second demo below.
  2. Add it to Stem Separator and choose Bass and Drums, or all four stems.
  3. Run separation and compare the returned parts with the original. This synthetic sample tests the workflow, not vocal-isolation quality.

Your browser and your files

Start with a short file and verify a small export before a long session. Browser storage is not a backup. No all-device performance guarantee is implied by these screenshots.

Audio privacy and measurement choices

Hear the actual separated results

These are the unedited bass and drum estimates returned by HTDemucs for the demo above. They are not the clean synthesis sources. Compare leakage, attack and note length with the original; this sample contains no vocals.