What does a bass booster do?
A bass booster turns up the low end of a song: the kick, the 808s, the sub bass, the bottom of a bass guitar. This one uses a low shelf, the same filter a studio equalizer uses, so everything below the point you choose comes up together and everything above it is left exactly as it was.
Boosting bass on a finished song is where most free tools fall apart: a modern master already sits near the loudest level a file can hold, so adding 12 dB of bass makes every kick clip and crackle. Here a limiter runs behind the boost and dips the whole track for the length of each bass hit instead. That dip is the "bass boosted" sound people know from car audio and YouTube edits.
Everything happens in your browser. The file is read, boosted and rendered on your own device and never uploaded, and the download is rendered through exactly the chain you heard.
How to bass boost a song online
- 1
Upload your song
Drag an audio file onto the box above, or click to browse. MP3, WAV, FLAC, M4A, AAC, OGG, OPUS and WebM all work, up to 250 MB.
- 2
Press play and move the slider
Pick Light, Medium, Heavy or Extreme, then move the boost while the song plays. Choose Deep for subs only, Punch for a club kick, or Warm for a fuller, rounder sound. Flip to Original any time to compare.
- 3
Boost and download
Press Boost the Bass to render the whole file with exactly what you heard, then save it as a 320 kbps MP3 or lossless WAV.
What people bass boost
Bass boosting started in car audio and lives on in headphones, phone edits and remix culture. Here is where it earns its keep.
Car and speaker playlists
A boosted copy brings up the low end that a car system or a party speaker is built to show off, without turning the whole track up.
Headphones and earbuds
Small drivers roll off the bottom. A few dB of Punch gives thin earbuds the weight you hear on a big system.
Edits, memes and "bass boosted" versions
The exaggerated Extreme setting is the classic bass boosted meme sound: the limiter squashing everything else each time the kick lands.
Beats and rough mixes
A producer's rough bounce often sits bass-light. Deep brings up the sub without muddying the mids, as a quick check before the real mix.
Thin recordings
Phone videos, voice memos and old rips can sound tinny. Warm fills out the bottom of a voice or an acoustic guitar.
What each control does
- Bass boost
- How many dB the low end comes up, from 0 to +15. The number is the gain at the very bottom; at the shelf frequency itself it is half that, which is how a shelf filter is defined.
- Where the bass sits
- The point below which the boost applies. Deep is 60 Hz (subs and 808s only), Punch is 100 Hz (the kick and the bass guitar), Warm is 150 Hz (a fuller, rounder sound that also lifts the low mids).
- The limiter
- Always on, with a ceiling just under the loudest level a file can hold. When the boosted bass would clip, it turns the whole track down for that moment instead. Heavy settings therefore sound a little more squeezed as well as deeper.
- Presets
- Light is +3 dB of Punch, Medium +6 dB of Punch, Heavy +9 dB of Deep, Extreme +12 dB of Deep. A preset shows as selected only while the slider and the range still match it.
Bass booster vs equalizer vs volume booster
Bass booster
One shelf, one slider, a limiter behind it. Turns the low end up and keeps the result from clipping. This tool.
Equalizer
Many bands, each up or down. More control, more ways to get it wrong, and usually no limiter, so a big low boost clips. Use it when the mids or highs need work too.
Volume booster
Turns everything up by the same amount. Louder, not deeper. If the song is simply too quiet, use Online Mastering, which raises loudness with proper limiting.
Frequently asked questions
Is this bass booster free?
Yes, completely. No sign up, no watermark, no paid tier; files up to 250 MB. The tool runs inside your browser, so there is nothing for us to meter.
Will the bass boosted song distort?
No. A limiter sits behind the boost with a ceiling just under full scale, and a safety stage behind that. Instead of clipping, heavy settings make the track dip for the length of each bass hit, which is the bass boosted sound rather than a broken one.
Is my song uploaded anywhere?
No. Your file is read, boosted and rendered by your own browser and never leaves your device. You can disconnect from the internet after the page has loaded and it still works.
Which setting should I use?
Medium (+6 dB, Punch) suits most songs on headphones or a car system. Use Deep when you only want the subs and 808s to come up, Warm for a thin recording or a voice, and Extreme when you want the exaggerated bass boosted edit sound.
Is this a bass boosted converter?
Yes, in practice: a "bass boosted converter" is a tool that takes a song in and gives a bass boosted file back, which is what this page does. Upload an MP3, WAV, FLAC or M4A and download MP3 or WAV.
Why does the boosted version sometimes sound quieter in the middle?
Because the limiter is doing its job. When a kick lands with 12 dB more bass, the limiter turns the whole track down for a few milliseconds so nothing clips, and the vocals and hi-hats dip with it. Lower the boost, or switch from Deep to Punch, if you want less of that pumping.
Keep going with your track
Boosted the bass? These tools pair well with it.