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About

Demucs.net exists for one reason: running Demucs should not require setting up Python, PyTorch and CUDA first.

What this site is

Demucs is an open-source music source separation model — it takes a finished song and pulls it apart into vocals, drums, bass and the rest. It is genuinely good, and it is free. What it is not is easy to install if you do not already live in a Python environment, and it wants a GPU to be quick about it.

This site hosts the model so you can skip that. You upload a track, it runs on a GPU somewhere else, and you get your stems back.

What this site is not

Demucs.net is an independent, unofficial web interface. It is not affiliated with, endorsed by, or sponsored by Meta Platforms, Inc. or the authors of Demucs. We did not write the model and we do not speak for the project.

The upstream project lives at github.com/facebookresearch/demucs. If you want to run it yourself, that is where to start, and we would rather you did that than pay us if your machine can handle it.

Note that the upstream repository states it is no longer maintained — its author has left Meta. The released models still work, and a community fork carries critical fixes.