Bass Booster & Audio Equalizer
A bass booster and 10-band audio equalizer that you hear before you save: pick Bass boost or one of twelve other presets, or shape all ten bands yourself, and the live preview runs the same ten filters the download uses. Headroom and a peak limiter keep heavy bass from distorting. It works on MP3, WAV, M4A and FLAC in your browser, with no upload.
- Runs on your device
- Web Audio
- WebCodecs · GPU
- Works offline
Updated
How to bass boost a song
Step 1: Drop a song on the box above. The equalizer appears with its ten band sliders.
Step 2: Choose Bass boost (or another preset) and set Preset strength; pick Custom to drag the bands yourself.
Step 3: Press play to hear it live, and flip Hear the original to compare.
Step 4: Press Apply and download the bass-boosted file.
Good to know
Formats
Batch-friendly: add many files and they are processed one after another — if one fails, the rest still finish.
How it runs
- Web Audio
- Audio is processed with the browser’s built-in Web Audio engine, sample-accurate and fast.
- Hardware video engine
- Video is decoded and encoded by your device’s media hardware through WebCodecs — usually several times faster than real time.
What the presets do to each band
Every preset is a curve across the ten bands, scaled by Preset strength. At the default 70%, Bass boost adds about 5.6 dB at 31 Hz and 4.9 dB at 62 Hz, fading to almost nothing by 500 Hz, so kick drums and bass lines grow while voices stay clear. The table shows the full-strength curves of the most-used presets.
| Preset | 31 | 62 | 125 | 250 | 500 | 1k | 2k | 4k | 8k | 16k |
|---|---|---|---|---|---|---|---|---|---|---|
| Bass boost | +8 | +7 | +5 | +3 | +1 | 0 | 0 | 0 | 0 | 0 |
| Treble boost | 0 | 0 | 0 | 0 | 0 | 0 | +1 | +3 | +5 | +7 |
| Vocal clarity | −4 | −3 | −2 | 0 | +1 | +3 | +4 | +3 | +1 | 0 |
| Podcast voice | −8 | −6 | −3 | −1 | 0 | +1 | +2 | +3 | +1 | −1 |
| Loudness (smile) | +6 | +5 | +2 | 0 | −1 | −1 | 0 | +2 | +4 | +6 |
| Phone / small speakers | −6 | −3 | +2 | +3 | +2 | +1 | +2 | +3 | +1 | 0 |
How to increase the bass in an MP3
To bass boost an MP3, choose Bass boost and start at the default 70%. If the low end still feels thin, go to 85–100%; if the song starts to sound muddy or boomy, drop to 40–50%. Play the preview while you move the slider: the change is instant, and Hear the original switches the equalizer off for a direct comparison.
For more control, choose Custom and raise only 62 Hz and 125 Hz for punchy bass, or 31 Hz for deep sub-bass that small speakers cannot reproduce anyway. Each band moves up to ±12 dB.
Will boosting bass cause distortion?
Not in the file. Bass carries a lot of energy, so a big boost pushes peaks over the digital ceiling and they would clip. The equalizer first lowers the overall level by a little under half of the largest boost to leave headroom, then a true-peak limiter at −1 dBTP catches anything that still pokes through. The result card tells you when the limiter had to step in.
Speakers are another matter: a phone speaker or small Bluetooth speaker cannot move enough air for 31 Hz, and asking it to may make it rattle at high volume. Use the Phone / small speakers preset for those.
What EQ settings make a voice clearer?
Cut the low rumble and lift the presence range around 2–4 kHz, where consonants live. Vocal clarity does that for singing and voice-overs over music; Podcast voice cuts the lows harder (−8 dB at 31 Hz) for spoken word recorded on laptop or headset mics. If the voice is buried under background noise rather than dull, clean it first with the noise reducer; EQ cannot remove noise that shares the voice’s frequencies.
What is a 10-band equalizer?
A 10-band graphic equalizer, like this audio equalizer online, splits the sound into ten frequency bands an octave apart, from 31 Hz (sub-bass) to 16 kHz (air), and gives each its own volume slider. Raise a band to bring that range forward; lower it to tame it. Here the lowest and highest sliders are shelves: 31 Hz lifts or cuts everything below about 45 Hz, 16 kHz everything above about 11 kHz, and the eight bands in between are bell-shaped filters one octave wide.
Is bass boost good for headphones or a car?
Often, yes. Earbuds and many car systems lose low end, so 50–70% Bass boost restores it. Good headphones and cars with a subwoofer usually need less; above 70% the bass can mask vocals. For a car, boosting 62–125 Hz tends to translate better than 31 Hz.
Tips & troubleshooting
Whole song too quiet rather than thin? Use the volume booster instead of boosting every band.
Making a slowed and reverb edit? The slowed and reverb generator has its own bass control for that style.
After EQ, bring several tracks to one level with normalize audio.
Save as WAV or FLAC if you plan to edit further, so the boosted file is not re-encoded twice.
Equalizer & Bass Booster FAQ
How do I bass boost a song?
Drop the song here, choose Bass boost, set the strength (70% is a good start), check it with the live preview and press Apply. The bass-boosted file downloads in the same format as the original unless you pick another under Save as.
Will boosting bass cause distortion?
The file will not clip: the equalizer leaves headroom and a limiter catches the loudest peaks. Very small speakers can still rattle on deep bass at high volume, which the Phone / small speakers preset avoids.
Can I hear the result before saving?
Yes, which is the main difference from a one-click bass boosted song maker. The preview plays your song through the same filter curve the export uses, and updates as you move a slider. Only the peak limiter differs slightly, so very loud boosts can sound a touch different in the file. Switch on Hear the original to compare with the unprocessed sound.
What is the difference between a bass booster and a volume booster?
A bass booster raises only the low frequencies, making the sound fuller. A volume booster raises everything equally, making the whole file louder. Use the one that matches what is missing.
Is my music uploaded?
No. The preview and the export both run in your browser, so the song never leaves your device.