Audio / Effects
Bass Booster
Boost the bass of any song or audio file in your browser, up to 15 dB, with a limiter that stops it distorting, and download it as MP3 or WAV.
Bass Booster: The booster lifts everything below about 100 Hz with a low-shelf filter, the same kind of control as a bass knob, by up to 15 dB. Boosting bass raises the peaks, so a limiter catches them and the result is scaled to stay below full scale instead of clipping. Runs 100% locally in your browser with zero server file uploads.
- Category
- Video tools
- Runs
- In your browser
- Cost
- Free · no sign-up
- Availability
- Ready to use
Runs entirely in your browser
MP3, WAV, M4A, OGG, or FLAC · up to 20 minutes, nothing uploaded
Your file is processed in your browser and never uploaded. Changing the speed changes the pitch too, as in slowed and sped-up edits. MP3 files are encoded with LAME, free software under the LGPL, loaded as a separate file; its source is at lame.sourceforge.io. Only edit music you have the right to use.
Bass, headroom, and clipping
Digital audio has a ceiling, full scale, and most mastered music already sits close to it. Boosting the bass by 6 dB doubles the level of the low end, so without a limiter the loudest moments would be cut off flat, which sounds harsh. The booster limits those peaks and keeps the file below full scale.
The deepest bass, below about 60 Hz, is felt as much as heard and needs large speakers or good headphones. On phone speakers, boosting the 100 to 200 Hz region sounds fuller than boosting the sub-bass they cannot play.
Checking the result
Listen on the system you will play it on, and at moderate volume. To measure the finished track's loudness, use the LUFS meter, and the audio normalizer brings it to a standard level for streaming.
How to use it
- Choose an audio file.
- Raise the bass slider while the preview plays until it sounds right on your headphones or speakers.
- Download the boosted track as MP3 or WAV.
Privacy & limitations
The audio never leaves your device; everything is processed in your browser.
Related tools
Frequently asked questions
How much bass boost should I use?
Start around 6 dB and go higher only if it still sounds clean. Small speakers and earbuds cannot reproduce deep bass, so on them a large boost mostly adds distortion and makes everything else quieter.
Why does the song sound quieter overall?
Extra bass uses up headroom, so the limiter has to bring the peaks down. The rest of the mix ends up a little quieter relative to the bass, which is the trade-off of any bass boost.
Can a bass boost damage speakers?
Very large boosts played loudly can overdrive small speakers and car subwoofers. Raise the volume gradually and stop if you hear rattling or distortion.
Which formats can I use?
Any audio your browser can decode, such as MP3, WAV, M4A, OGG, and FLAC. The result is saved as MP3 at 192 kbit/s or WAV.
Free tool · runs in your browser · no account required