Isolate bass from song audio splitter, free

Last updated: September 2026

Free, no account. It's a way to isolate bass from song online free of any watermark, with no install needed first.

Your upload is deleted the moment the split is finished. Want WAV, play-along mixes or longer tracks? The full tool is on the home page.

Hear the bass line on its own

Bass is one of the cleanest stems our model produces, so you can finally hear exactly what the bassist is playing instead of guessing under the kick. StemGrab isolates it into its own MP3, along with the drums, vocals and everything else from the same upload.

• Learn a bass line note-for-note by ear
• Loop a section slowed down in your own player
• Transcribe the groove for tab or notation
• Sample a clean bass tone for production

How to isolate the bass

1. Open StemGrab and drop your song in (MP3, WAV, FLAC, M4A).
2. Let it separate on our GPU.
3. Download the bass stem as a 192 kbps MP3.
4. Grab the drums stem too if you want a rhythm-section-only backing to play over.

Practise with the isolated part

Once you've got the bass on its own, mute it and play along to the rest, or solo it to learn every note. Our practise any instrument with stems guide walks through both. Want a different instrument? Remove or isolate the drums uses the same one-upload flow. Rather read the line than transcribe it by ear? MP3 to MIDI turns the isolated bass into a MIDI track with the actual pitches and note lengths already written out.

Vocals, drums and bass come out remarkably clean on most modern, well-mixed tracks. Guitar and piano are newer, experimental stems and can be rougher, especially in dense mixes; lo-fi, live or heavily reverbed recordings are harder for any tool. Give the tricky ones a listen before you build on them.

Learning a bass line by ear

Working out a bass line from a full mix is mostly guesswork, because the kick drum sits on top of the bass in exactly the range you're straining to hear, and cheap speakers roll off the bottom two octaves entirely. Isolating the bass removes the guessing: you hear the actual notes, the actual slides, and the ghost notes that get buried under a snare on the record.

Start with the two numbers StemGrab shows next to the stems. The key tells you the root, which narrows the note choices from twelve to about seven before you've played anything, and it instantly explains why a line "sounds wrong" when you've been reading it in the wrong key. The tempo matters because the proper way to learn a fast line is to slow it down: any free audio editor or phone app will play a file at 70% speed without changing the pitch, and knowing the original BPM tells you what you're working back up to.

Then listen for the things a mix hides. Slides and glissandi between notes are usually inaudible in a full mix and obvious in isolation. So is note length, which is most of what makes a bass line feel like funk rather than a sequence of correct pitches. And on fingerstyle playing you can often hear where the player muted a string, which tells you the fingering as much as the notes do.

What bass separation gets wrong

Bass is one of the cleanest stems our model produces, but there are three predictable failure modes and all three are physics rather than bugs. Kick and sub-bass overlap. On modern productions, especially hip-hop and electronic music, the kick drum and the bass note occupy nearly the same frequencies, so a low sustained 808 sometimes lands partly in the drum stem and partly in the bass stem. If a note sounds shorter than it should, mute the drums as well and you'll hear the rest of it.

Synth bass with a bright edge can be split: the fundamental goes to the bass stem while the buzzy top of the waveform gets read as a synth and lands in "other". The line is still perfectly learnable, it just sounds duller than the record. And upright bass in jazz recordings is the hardest case, because the bow and finger noise share a lot with the room and the cymbals; expect the isolated part to be usable for transcription but not for sampling.

Use the mixer to work around all of this instead of re-uploading. Solo the bass to transcribe, then un-mute the drums to check your timing against the kick, then download selected to take just the bass and drum stems as a practice loop. That two-stem version, bass plus drums with nothing else, is the most useful practice file the tool produces and it costs you nothing extra.

The other six stems

This page is about the bass, but every upload returns all seven stems, so the same split isolates the drums, the vocal, the guitar or the piano too. Guitar and piano are the newer, more experimental stems: expect more bleed on a dense mix than on the bass, and treat piano as a best effort when it competes with a similar-sounding guitar. If you're after a guitar part, our practice guide covers pulling a guitar part free of the mix. For music in a video, pull the soundtrack out with our video-to-audio tool (extract audio from the file) first, then run it through here. Here is how to isolate tracks from a song beyond the bass: every upload returns all seven stems, so download the ones you want and ignore the rest. To extract stems from song material as lossless WAV instead of MP3, use the full tool on the home page. A free song splitter online like this one takes tracks up to 15 minutes on the free tier, with a daily limit on top. You can separate songs one after another: upload one, download its stems, then drop in the next. To separate tracks in a song longer than 15 minutes, cut it into parts first and upload them one after another; an optional one-time pass raises the limit for hour-long tracks.

The same trained model runs on every upload, whether you download only the bass file or all seven, so this is a song splitter first with a bass-focused page, not a separate bass-only tool. That's what a song splitter AI means here: one stem separator, one stem splitter run per upload, and every file from it, from the vocal stems to the bass. The plural stems splitter or a song track splitter name gets you exactly the same seven files. To remove bass from song material instead, keep the other six stems and leave the bass out when you combine them in an editor; there's no one-click bass-free file. The same goes for any instrument: download only the stems you want and skip the rest. If you want the drums or the guitar instead of the bass, download that stem from the same upload; there is no need to run the split twice. Seen that way, an AI song stem splitter is one model that returns every stem at once, and the bass is just the file you pick. Is the song splitter free? Yes, for tracks up to 15 minutes and 10 splits a day, with no account.

Odds and ends