Pro studio tools, free in your browser.
Split stems, find a song's key, measure loudness, test your mic and map your room's bass. No sign-up, no uploads: your audio stays on your device.
Split a song- Free
- No sign-up
- Runs on your device
- No watermark
Tools
All tools by job- Key FinderFind the musical key and Camelot code of any song in your browser. Nothing is uploaded.
- Loudness MeterMeasure LUFS, loudness range and true peak, and see if a track or podcast is too quiet, too loud or clipping. Nothing is uploaded.
- Vocal RemoverSeparate vocals from the instrumental in your browser. Nothing is uploaded.
- Room Mode CalculatorList a room's standing-wave modes up to 300 Hz, check how evenly they spread, and estimate the Schroeder frequency.
- Mic TestMeasure your mic's noise floor, plosive energy and sibilance frequency live. Nothing is recorded or uploaded.
- Voice RecorderRecord from your microphone, play the take back and download it as WAV or in the browser's own format. Nothing is uploaded.
- Tone GeneratorPlay sine, square, triangle and sawtooth tones from 20 Hz to 20 kHz, pick a note, set the channel or run a sweep.
- Pitch ChangerChange a song's pitch by semitones and cents, or its speed, without changing the other. Nothing is uploaded.
- Sound TestCheck speakers or headphones: left and right channels, stereo panning, polarity and a frequency sweep up to your browser's top frequency.
- Voice ChangerRecord your voice or open a file, apply a pitch or effect preset, and download the result as WAV. Nothing is uploaded.
- Slowed + Reverb MakerSlow a song down and add reverb, or make a nightcore or 8D audio version, then download it as WAV. Nothing is uploaded.
- Audio to MIDITurn a recording of one voice or one instrument into notes, check them on a piano roll and download a MIDI file. Nothing is uploaded.
- MP4 to MP3Extract the sound from an MP4, MOV or WebM video and save it as MP3 or WAV. Nothing is uploaded.
How it works
- 1
Drop your file.
Any MP3, WAV or M4A.
- 2
It runs here.
The model downloads once, then works on your device.
- 3
Download.
WAV, no watermark.
Your music stays yours.
Most online tools upload your song to their server. Ours don't: the processing happens in your browser, so unreleased tracks never leave your computer.
Questions
Is it really free?
Yes. There is no sign-up, no paid tier and no watermark on the files.
Do you upload my files?
No. Your file is decoded, separated and saved inside the browser tab. Only the AI model and the engine that runs it download, and they come to your device, not from it.
Why is the first run slow?
The first time, the browser downloads the AI model and saves it. The next song starts without that download.
Which browsers work?
Any modern browser, including on phones, for the Fast mode. The four-stem Studio mode is fastest in browsers with WebGPU and slower on your processor without it.
Can I use the stems commercially?
Only if you have the rights to the song. The tool does not change who owns the music.