Free Online Bass Booster
Boost the bass of any song with a low shelf from 30 to 250 Hz and up to 15 dB, with a built-in soft limiter so it never clips.
Source
Loops while you adjust. Match loudness sets the effect to the same average level as the original while previewing, so you judge the tone and not the volume. It does not change the export.
Bass booster
Drag a knob up or down, or focus it and use the arrow keys. Double-click or press Delete to reset one knob.
Meters
The safety limiter only protects the preview. The export is turned down as a whole if needed, so peaks stay under -1 dBTP.
Export
How to use the bass booster
How to use it
Boost raises everything below the frequency setting. Frequency moves the point where the boost starts. A built-in limiter catches the extra peaks, and the meter shows how hard it is working.
The level is lowered by part of the boost before the limiter, so the limiter only touches the loudest hits.
Sensible starting settings
- More weight on a thin song: boost 3 to 5 dB at 80 to 100 Hz.
- Sub bass for hip-hop or EDM: boost 4 to 6 dB at 50 to 60 Hz.
- Warmer voice: boost 2 to 3 dB at 150 to 200 Hz.
- If the bass limiter meter often shows more than 3 dB, lower the boost.
Listen on more than one system
Small speakers cannot play deep bass, and headphones can exaggerate it. Check the result on headphones and on a phone before you keep it.
Runs in your browser, exports a 24-bit WAV.
How it works.
- 1
Drop in a file
MP3, WAV, FLAC or M4A. It is decoded on your device.
- 2
Adjust while it plays
Turn the controls and hear the change live. Use bypass and loudness match to compare fairly.
- 3
Save a 24-bit WAV
Render the full file and download it with your plan access. Your original is unchanged.
Questions.
Will boosting bass make it distort?
A soft-knee limiter after the boost and a final level check keep the file from clipping. Very large boosts can still sound heavy or pumping, so use your ears and the meter.
Why does my song sound quieter overall?
To leave room for the extra bass, part of the boost is taken off the overall level. Turn on Match loudness to compare at equal volume.
What frequency should I pick?
50 to 60 Hz for sub bass, 80 to 100 Hz for kick and bass weight, 150 to 200 Hz for warmth.
Is this the same as mastering?
No. It is a single tone change. It does not set a loudness target or balance the whole mix.
Is my audio uploaded?
No. The file is decoded and processed in your browser with the Web Audio API. Nothing is sent to a server.
Can the export clip?
No. After rendering, the tool estimates the true peak between samples. If it would go above -1 dBTP, the whole file is turned down by the amount needed, and that amount is shown.