Minus One Maker: Take the Vocals Out of Any Song
Turn any song into a minus one: the AI takes the singer's voice out and leaves the music, ready for videoke, a church or school performance, or practice. Pick an MP3 or a music video (MP4); it runs in your browser and the song is never uploaded. Free, no sign-up.
Your file never leaves your device. How?
Your media is processed in your browser and is not uploaded to our servers for conversion. Page assets (including the converter engine) still load over the network.
Select or drop a song
MP3, M4A, WAV, FLAC or a music video. The song is processed on your device.
Click, tap, or drop a fileHow to make a minus one
Choose the song
Pick an MP3, M4A or WAV, or the music video (MP4) saved on your phone or computer.
Let the model download once
The first time, about 43 MB downloads and is saved in your browser for next time.
Remove the vocals
The song is split on your device into the music and the voice. A full song takes a few minutes.
Download the minus one
Play the instrumental and download it as an MP3. The vocals-only track is there too.
Where people use a minus one
Videoke and birthday parties, church choirs and praise teams, school programs, recitals and singing contests: a minus one is what the singer performs over. Making your own means you can have one for any song, even one nobody has uploaded a minus one of.
The vocals-only track (an acapella) helps too: learn the melody and the words before you sing over the minus one.
How the AI separation works
The tool uses an MDX-Net model from the open-source Ultimate Vocal Remover project. The song is turned into a spectrogram a few seconds at a time, the model predicts which parts are voice, and those parts are turned back into audio. The instrumental is the original song minus the vocals. Everything runs in your browser with ONNX Runtime, on your graphics card through WebGPU where available, otherwise on the processor.
Results are best on studio recordings with a clear lead vocal. Heavy reverb, backing choirs, live recordings and instruments that sit in the same range as the voice (like a lead violin or saxophone) can leave faint traces. This is a compact model chosen so it can run on ordinary laptops; large server models separate a little more cleanly.
Features
Never uploaded
The song stays on your device, so unreleased music and private recordings are safe.
Both tracks
Download the instrumental (karaoke), the vocals (acapella), or both.
No limits
No account, no watermark, no songs-per-day cap.
Works offline after setup
Once the model is saved in your browser, separation doesn't need the internet.
Frequently asked questions
What is a minus one?
A song with the singing taken out and the music left: the instrumental you sing over. In the Philippines it's called a minus one; elsewhere a karaoke or backing track.
Can I make a minus one from an MP4?
Yes. Pick the music video and its soundtrack is used; the minus one comes out as an MP3 (or WAV).
Can I make a minus one of a song on YouTube?
Pick a song or video file that's on your phone or computer. This tool doesn't download from YouTube or other sites.
Does it take out the backup singers too?
It takes out the voices it hears, the lead and most backing vocals. Choirs, heavy echo or live recordings can leave faint traces.
Is my song uploaded?
No. Only the AI model is downloaded, once. The song is split in your browser and never leaves your device.
Is it free?
Yes: no sign-up, no watermark and no songs-a-day limit.
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