AI Stem Splitter, 4-Stem Separation
Extract vocals, drums, bass and other instruments from any song
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How to Split Any Song Into 4 Stems
What is a stem splitter? A stem splitter is an AI tool that separates a mixed song into individual instrument tracks called stems. Modern stem splitters use deep neural networks to isolate vocals, drums, bass and other instruments as separate audio files. Producers, remixers, DJs and vocal coaches use stems for sampling, mashups, karaoke, practice and vocal isolation. RemoveVocals extracts 4 high-quality stems for free, directly in your browser, with no upload.
RemoveVocals Stem Splitter uses a hybrid time-frequency neural network trained on a large dataset of multitrack recordings. Each 10-second window of the song is processed through two parallel branches: a waveform branch that learns directly from the raw audio, and a spectrogram branch that learns from the time-frequency representation. The two branches meet in a cross-attention bottleneck, then each decodes back into 4 stereo stems: vocals, drums, bass and other instruments.
Processing runs on Web Workers for maximum responsiveness, with the heavy DSP work moved off the main thread. The model is cached locally after the first download for instant re-use on subsequent songs. After splitting, transpose any stem, fine-tune the EQ or run stems through AI Mastering.
Everything runs 100% in your browser. No uploads, no signup, no limits.
Key Takeaways
- 4 high-quality stems from any song vocals, drums, bass and other instruments, separated by a hybrid time-frequency neural network in your browser.
- 100% local processing the AI model runs in your browser. Audio never leaves your device, never touches a server.
- Free and unlimited no signup, no credit limit, no watermark.
- All stems as WAV 16-bit PCM WAV ready to drop into any DAW (Ableton, Logic, FL Studio, Pro Tools, Reaper).
- Works on any genre pop, rock, hip-hop, R&B, electronic, metal, jazz, classical. Modern studio mixes give the cleanest stems.
- Use cases remixes, mashups, sampling, karaoke, vocal practice, cover versions, DJ edits, film/video sync.
Stem Splitter vs. Paid Alternatives
About the RemoveVocals Team
RemoveVocals is a suite of free, browser-based audio tools built by a small team of audio engineers, music producers and ML practitioners. We ship and maintain stem splitting, vocal removal lyrics transcription key detection BPM detection AI mastering and more, all running in your browser with zero retention of user data. Since 2024 we've served thousands of songwriters, producers, beatmakers and DJs every day. Learn more about us.
Frequently Asked Questions
What is a stem splitter?
A stem splitter separates a mixed audio track into individual components. RemoveVocals extracts 4 high-quality stems using a hybrid time-frequency neural network that runs locally in your browser.
How many stems can I extract?
4 stems: vocals, drums, bass and other instruments.
Is it free?
Yes, completely free. No signup, no watermarks, no limits. All processing runs in your browser using Web Workers.
How does 4-stem separation work?
A hybrid time-frequency neural network processes 10-second windows of the song in parallel waveform and spectrogram branches that meet in a cross-attention bottleneck, then outputs 4 separate stereo stems in a single inference pass.
What is HPSS?
Harmonic-Percussive Source Separation uses median filtering on the spectrogram to separate transient percussive content (drums) from sustained harmonic content (instruments).
Is my audio uploaded to a server?
No. All audio is processed directly in your browser using WebAssembly and Web Workers. Your files never leave your device, no uploads, no server-side processing, no storage, no logs, and nothing is used for training.
How is a stem splitter different from a vocal remover?
A vocal remover only produces two outputs: vocals and instrumental. A stem splitter breaks the track into more components: in our case 4 stems (vocals, drums, bass, other instruments). Use a vocal remover for karaoke; use a stem splitter for remixing, sampling, or isolating a specific instrument.
Does it work on all music genres?
Yes. The model is trained on a broad range of pop, rock, hip-hop, EDM, R&B, jazz, classical, metal, and acoustic material. Quality is best on modern, well-mixed productions and slightly lower on very dense mixes or heavily distorted guitars.
What audio formats are supported?
MP3, WAV, FLAC, OGG, M4A, AAC, and most common formats. Maximum length is 12 minutes per upload. Output stems are delivered as individual WAV files you can download one by one or all at once.
Can I use the stems commercially?
You can use stems from tracks you own or have the rights to (your own recordings, demos, royalty-free music). For copyrighted material, you are responsible for clearing sampling and derivative-work rights with the original rights holders, same rules as any DAW plugin.