Audio stem separation
Separate Vocals and Instrumental from a Song Online
Stem separation estimates the individual layers inside a finished stereo mix. It can create useful practice tracks, edits and production references, but it does not recover the untouched studio stems used during the original recording.
How to use it
- Choose the output
Use two stems for vocals and instrumental, or four stems when drums and bass need their own files.
- Upload a finished track
MP3, WAV and M4A files are accepted in the private beta.
- Preview and download
Listen to each generated stem in the browser, then save the files you need before they expire.
Two stems or four stems?
Two-stem mode is the direct choice for karaoke, acapella practice and a broad instrumental. Four-stem mode separates vocals, drums, bass and other, which is more useful for edits and production study but exposes more artefacts between neighbouring instruments.
Both modes use the same duration-based beta credits because the user-facing cost follows the uploaded audio length rather than an opaque job count.
Privacy and realistic quality
Jobs are processed by a private worker, belong to the authenticated user and expire after 24 hours. The public site does not index filenames, waveforms or generated stems.
Separation is an estimate made from a mixed master. Shared reverb, distorted guitars, backing vocals and frequency overlap can leak between stems; the result is useful audio, not access to the original multitrack session.
Common questions
Are uploaded songs public?
No. Separation jobs belong to the signed-in account and uploaded files plus generated stems are deleted automatically after 24 hours.
Why can I still hear part of the vocal in the instrumental?
Reverb, distortion and sounds occupying the same frequencies are difficult to untangle from a finished mix. Small artefacts are normal for source separation.