Bass Booster
Lift the low end with a low-shelf filter and adjustable crossover, then export a WAV.
Lift the Low End of a Track
A "bass boost" is a low-shelf filter: everything below a chosen crossover frequency is raised by a set number of decibels, and everything above it is left alone. Understanding that turns the effect from a magic button into a tool you can aim.
Where you put the crossover decides what gets louder. Around 80 to 120 Hz you are lifting kick drums and bass guitar. Push it up past 200 Hz and you start thickening voices and guitars, which is usually not what anyone means by more bass. This tool exposes both controls, renders the result with the browser’s own filter engine, and shows you the peak level so you know when the boost is about to clip.
Key features
- Up to +18 dB of low shelf — a genuine lift, applied by a proper biquad filter rather than a crude volume trick.
- Adjustable crossover from 60 to 320 Hz — decide exactly which part of the spectrum counts as bass.
- Optional treble shelf — add air at the top or pull it back, so a bass lift does not leave the track sounding muffled.
- Clipping warning — the peak level after EQ is shown, with a warning when the boosted signal reaches full scale.
- A/B against the original — render and play, then compare with the untouched file.
This tool runs entirely inside your browser using native Web APIs. Your files and text are never uploaded to a server, never logged and never shared with third parties.
How to use: Bass Booster
- Drop in the track
The file is decoded locally and rendered with the default boost so you have something to hear immediately. - Set the amount and crossover
Raise the bass control and move the crossover until the lift lands where you want it. Lower frequencies for weight, higher for warmth. - Watch the peak readout
If it reaches 100%, reduce the boost — the export would otherwise clip. - Render and download
Press Render to apply the settings, listen, then save the result as a WAV.
Technical specifications
| Processing location | Entirely in your browser — no server round trip |
|---|---|
| Data uploaded | None. Files and text never leave your device |
| Price | Free — no account, no trial, no usage cap |
| Category | Audio |
| Works offline | Yes, once the page has loaded |
| Browser support | Chrome 90+, Edge 90+, Firefox 90+, Safari 15+ |
| Interface languages | English, 中文, हिन्दी, Español, العربية |
Frequently asked questions
Will this add bass that was never recorded?
No. An equalizer can only amplify what is already in the signal. If a recording has nothing below 100 Hz, boosting that region raises noise rather than bass. No processing can recover content that was never captured.
Why does the track get quieter or distort when I boost?
Adding energy pushes the peaks towards full scale. Once they hit it, the file clips. Either reduce the boost or lower the overall level afterwards with our Volume Booster set below 100%.
What crossover frequency should I use?
Start at 100 to 150 Hz for most music — that captures kick and bass without touching vocals. Below 80 Hz you are affecting sub-bass only, which many speakers and all phone speakers cannot reproduce at all.
Can this damage my headphones?
Large bass boosts played loud make drivers work considerably harder, and sustained extreme settings can damage small drivers. Boost the file, then listen at a sensible volume.