Improved freemusicdemixer – AI music demixing in the browser
Hi HN, Last time I showed free-music-demixer, which people seemed to enjoy. It was a static website with a Javascript + WASM module to perform music demixing (or music source separation) using an AI model UMX-L (Open-Unmix) running client-side in the browser. Since then, I have overhauled the project and made several improvements: - The demixing/separation quality is higher now, since I implemented the missing post-processing step - Memory usage is lower now by performing a custom segmented inference with a streaming LSTM, which should allow larger tracks (or, dare I say,…
In plain words
Improved freemusicdemixer is a browser-based tool that separates music into individual stems—vocals, drums, bass, and other instruments—using AI. It runs entirely client-side with no uploads required, processing audio through the UMX-L model. The latest version offers improved separation quality, reduced memory usage for handling longer tracks, batch processing of multiple files, and progress indicators. It's designed for musicians, producers, and anyone needing to isolate specific instruments from songs.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
Hi HN, Last time I showed free-music-demixer, which people seemed to enjoy. It was a static website with a Javascript + WASM module to perform music demixing (or music source separation) using an AI model UMX-L (Open-Unmix) running client-side in the browser. Since then, I have overhauled the project and made several improvements: - The demixing/separation quality is higher now, since I implemented the missing post-processing step - Memory usage is lower now by performing a custom segmented inference with a streaming LSTM, which should allow larger tracks (or, dare I say, arbitrarily-large tracks) - There is a batch upload feature now to demix an entire folder of songs (and provide zip files of the stems) - There are now dev logs printed to the website to show the progress better
Does the same job
all alternatives →- FAFree AI-based music demixing in the browser2023 · sevag.xyz · ▲190
Hi all, I've spent some time working on music demixing or music source separation algorithms, which take in a mixed song and output estimates of isolated components (e.g. vocals, drums, bass, other). I took a popular PyTorch model with good performance (Open-Unmix, UMX-L weights), reimplemented the inference steps in C++, and compiled it to WebAssembly for a free client-side music demixer.
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