W
Learning a line by ear
This is the main one. A bassline that is impossible to follow under a full mix becomes obvious the moment everything above it is gone.
FOUR-PART SEPARATION MODEL · 192 KBPS OUT · NOTHING TO INSTALL
Hear the bassline, on its own.
Drop in MP3 or WAV tracks and get the bass back. The model splits a song four ways — vocals, drums, bass and everything else — and hands you the bass. Bass is the part most worth isolating and the hardest to pick out by ear, because it sits under everything and shares its territory with the kick drum. Up to 50 at a time, nothing to install, no watermark.
Extract the bass
Up to 50 files
Drop your MP3 or WAV files here or browse
MP3
WAV
MP3
WAV
MP3
+45
Your basslines are ready
Extracted
Bass only · 192 kbps
MP3
MP3
MP3
MP3
MP3
MP3
+ 12 more queued
You upload a song, you get the bass. That is the whole app.
Every extraction is anonymous — we never track who uploads what
4.8 / 5
· 10,000+ paid
€1 day pass · €6 yearly · €30 lifetime · no ads, ever
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One account unlocks all 79 AppsCyborg tools
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How to extract the bass from a song — two steps
1
Upload your tracks
One song or 50 at once
2
Download the basslines
MP3
bass.mp3
192 kbps · bass isolated
Collect them within the hour. Download links expire 60 minutes after extraction. You get the bass; the other three parts are discarded. If you want the kit or the keys instead, Drum Cyborg and Piano Cyborg return those from the same four-way split.
Why the paid extractor is the one worth using
Free bass isolators are almost always a low-pass filter with a friendly name. They keep everything under a few hundred hertz, which means you get the bass, the kick drum, the low end of the piano and the rumble of the room, all glued together. A trained model recognises a bass by how it sounds and how it moves, not by how low it is, and that is a completely different result.
50 tracks in one pass
Queue a whole album instead of feeding songs in one at a time and waiting after each. Four-part separation is slow; batching is where you get the time back.
Anonymous and private
Your recordings stay yours. We do not track who uploads what, and files are never handed to third parties.
Not a low-pass filter
Cutting everything above 200 Hz is not isolation. The kick drum lives there, the low toms live there, and so does the bottom of every guitar chord. Splitting by what things sound like is the only way to get a track that is actually just the bass.
Try it for €1
A 24-hour pass is €1. No subscription, no auto-renewal — decide later.
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Day pass
€1
/ 24 hours
Just need a batch converted today? Unlimited conversions for 24 hours. No commitment.
- Unlimited conversions for 24h
- No subscription, no auto-renew
Yearly
€6
/ year
The price of a coffee, once — for a whole year of conversions.
- Unlimited for 365 days
- Best value if you convert often
Lifetime
€30
once
Pay once, own it forever. Every future format and update included.
- One payment, never again
- All future updates included
Every plan unlocks all 79 AppsCyborg tools — no ads, no watermarks, plus a 7-day money-back guarantee.
How €1 compares to “free”
| Bass Cyborg | Free online converter | Desktop app | |
|---|---|---|---|
| Files per batch | 50 | 1–2 | Many |
| File size limit | 200 MB, 30 min per track | Capped, often 10–50 MB | None |
| Output bitrate | 192 kbps | Often 128 kbps | Your choice |
| Nothing to install | Desktop app | ||
| Ad-free and no tracking | Ad-funded | ||
| Price | from €1 | Free (ad-funded) | €20–60 |
Free bass extractors exist because advertising pays for them, and most of them are low-pass filters rather than separators — they keep the bottom of the spectrum and call it a bassline, kick drum included. The ones running a real model cap your uploads, stop you after a track or two a day, and hand back 128 kbps. Bass Cyborg starts at €1 for a day, installs nothing, takes 50 tracks at once up to 200 MB and 30 minutes each, splits each one four ways, and returns 192 kbps.
The bass and the kick share a room
Bass separates well, but it has one characteristic problem, and it is worth knowing before you spend anything. The bass guitar and the kick drum occupy the same octave and often the same beat, and they were mixed to reinforce each other on purpose. The model tells them apart by how they behave over time rather than by pitch, which works most of the time — and when it does not, what you hear is a thump.
4
parts the model splits
192
kbps, on every file
50
tracks per batch
30
minutes per track
A four-way split, not a filter
4 partsThe song is separated into vocals, drums, bass and everything else, and you are handed the bass. That distinction is the whole product: a filter cannot separate two instruments that live in the same octave, and a model trained on real music can.
Sustain versus impact
timeA bass note holds and bends; a kick is a thud that is over in a moment. That difference in behaviour over time is what the model keys on, and it is why the result is far better than anything a frequency cut can manage.
Where it struggles
honestExpect some kick bleed — a soft thump on the beat that belongs to the drums. Heavily distorted or synth bass with strong upper harmonics can lose those harmonics to "everything else", leaving the line duller than the record. Sub-heavy electronic music, where the kick and the bass are deliberately one sound, is the hardest case of all.
You get the bass only
1 of 4The other three parts are produced and discarded. Drum Cyborg and Piano Cyborg return their own part from the same split, and Acapella Cyborg returns the voice.
Quality is preserved on the way out
192An MP3 upload comes back as 192 kbps rather than the 128 kbps most tools default to, and a WAV upload comes back as WAV. Low frequencies are cheap to encode, so the extra bitrate mostly protects the harmonics that tell you which note is being played.
The honest caveat: this is not the DI track
An extracted bassline is an estimate reconstructed from a finished mix, not the direct-input recording with everything else muted. For learning a line, transcribing it, checking your own low end or building a remix on it, that is plenty. Held against the real bass stem, with no kick anywhere near it, it is not the same object. Try one song before committing an album — the amount of kick bleed varies enormously by genre.
Want the song without the bass instead? That is not this tool — nothing here returns a bassless mix, and Vocal Remover Cyborg removes the singing, which is a different job.
See it in action
Bass Cyborg, start to finish · Watch the walkthrough →
A short walkthrough: drop the files, let the model work, download the basslines. That is the whole tool.
Ready to try it? Create your account above.
What people actually use it for
The bass is the part most often buried and most often worth hearing. These are the usual reasons:
R
Transcription
Writing out a part is far quicker when you can hear which note is actually being played, especially in the bottom octave where pitch is hardest to judge.
P
Working out the harmony
The root movement tells you what the chords really are. Isolating it settles arguments that listening to the full record never will.
F
Studying tone
How much pick attack, how compressed, how much of it is amp and how much is DI — none of that is audible until the guitars and drums are out of the way.
T
Sampling a line
An isolated line is far more usable than one with a kick glued to it. Clear the rights before you release anything built on it.
S
Checking your own low end
Run a reference track you admire through it and hear how loud, how clean and how compressed that bass really sits against the kick.
Whatever it is for, upload your tracks and get the bass back.
A different part?
The same four-way split feeds three other tools: Drum Cyborg for the kit and Piano Cyborg for the keys. For the voice, Acapella Cyborg; for everything except the voice, Vocal Remover Cyborg. Need the audio out of a video first? Extract Audio — all included in one account.
Common questions
Getting started
What is Bass Cyborg?
A web app that splits a song into four parts — vocals, drums, bass and everything else — and gives you the bass. It takes MP3 and WAV, runs a trained separation model on our servers, and returns the bassline at 192 kbps, up to 50 tracks at a time with nothing to install.
Does it work on a phone?
Yes. It runs on every Android phone and on iOS 12 or later. The separation happens on our servers, so a phone finishes as fast as a desktop — all you need is a browser.
How do I isolate the bass from a song?
Two steps. Drag your files onto the upload box at the top of this page — up to 50 at a time — then download the results individually or as a single ZIP. There is nothing to install and no settings to pick.
Quality, size and batches
How good is the result, honestly?
Good enough to learn a line from, which is what most people want it for. The characteristic flaw is kick bleed: the bass guitar and the kick drum share an octave and were mixed to reinforce each other, so a soft thump on the beat often survives into the bass track. How much depends heavily on the genre — a rock band with a clear pick attack separates well, while sub-heavy electronic music where the kick and the bass are deliberately one sound is the hardest case there is. Heavily distorted or synth bass can also lose its upper harmonics to "everything else" and come back duller than the record.
Do I get the drums and vocals too?
No. The model produces all four parts, but this tool returns the bass only. Drum Cyborg and Piano Cyborg return their own part, and Acapella Cyborg returns the voice. And if a track's name happens to contain the word "bass", you still get exactly one file per upload: the bassline.
How many files can I do at once?
Up to 50 per batch. Filenames are kept, and you can download the results individually or as a single ZIP. Splitting four ways is slower than the two-part tools, so a full batch of 50 takes real time.
Is there a size or length limit?
200 MB per file and 30 minutes per track. The length limit is the one that matters: separation holds the whole song in memory as it works, and a four-part split holds four output buffers rather than two, so a track longer than 30 minutes is refused outright rather than quietly returned with the end missing.
Which formats can I upload?
MP3 and WAV. An MP3 comes back as a 192 kbps MP3 and a WAV comes back as a WAV. If your file is FLAC, M4A or something else, run it through one of the converters first.
Can I give it a YouTube link?
No — this tool works on files you upload, not on links. If the song only exists to you as a video, get the audio first with MP3 Cyborg or Extract Audio, then bring the MP3 or WAV back here. Both are included in the same account.
Can I use an extracted bassline in something I release?
That is a licensing question, not a technical one, and separating a part does not give you any rights to it. The recording and the composition still belong to whoever owned them before. Isolating a line to learn or transcribe it is one thing; releasing or monetising a track built on it is another, and worth clearing properly.
Pricing, privacy & limits
How much does it cost?
A €1 day pass gives you 24 hours of unlimited conversions. Yearly (€6) and lifetime (€30) plans are also available (+ VAT). Every plan unlocks all 79 AppsCyborg tools, not just this one.
How long does my download link stay valid?
60 minutes. After that the link expires and the converted files are removed — just re-run the conversion if you need them again.
Do you track or store my files?
No. We do not apply advertising or analytics tracking to what you upload, and your files are never sold or shared for marketing. Uploaded audio is processed only to produce your bassline and removed when the 60-minute download window closes.
Is there a limit on how often I can convert?
No. While your day pass, yearly or lifetime plan is active you can run as many 50-file batches as you like — there is no monthly quota and no per-conversion charge.
Still have a question?
We usually reply within a day.
Your basslines are a few minutes away.
Create an account and upload your tracks — up to 50 at a time, 192 kbps out, and try one song first to hear how much kick your material lets through.
Free account
€1 day pass
Anonymous
Creating your account is free — you only pay when you convert
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