StemSplitterLab

StemSplitterLab is a practice tool disguised as a file converter. Open a song you already own and it separates into six stems — vocals, drums, bass, guitar, piano and other — each with its own fader, mute and solo. Mute the part you play and the rest becomes a backing track; the remover pages are the same split with a different stem muted by default.

The player is where it goes beyond splitting. Set an A-B loop around the bar you keep missing, slow it down without changing the pitch, shift the key without changing the speed, add a metronome or count-in once the drums are gone, and let the speed trainer raise the tempo after clean passes. Markers for verse, chorus and bridge make sections one click away. A mix or a single stem exports as WAV, and the mix can also go out as MP3.

The engineering choice is local processing. The audio is decoded in the browser and kept in that browser's storage, so the song is not uploaded and there is no account to attach it to; the first split downloads a separation file of about 136 MB once and later songs reuse it. Splitting, the practice tools and export are free. The site is candid about quality — vocals, drums and bass separate cleanest, distorted guitar and piano under pads are harder, and a printed reverb can leave a tail — and supports files up to 20 minutes.

Removing a vocal to sing over the backing track; muting the guitar or piano part while practicing; looping a difficult bar and slowing it down; changing the key before a rehearsal; exporting a drumless mix or a single stem.

The privacy page states that audio is decoded on the device, kept in browser storage so the library can reopen it, and never uploaded; deleting a song removes the local copy, and clearing site data removes the library. The separation model is a standalone file download that does not include the audio.

Official privacy policy