Add punch and warmth to any track with a low-shelf bass boost up to +15 dB and a selectable corner frequency. Live preview, free, no upload.
The bass booster adds weight to the low end with a single low-shelf filter: pick how much to boost (up to +15 dB) and the corner frequency where the lift begins (60–120 Hz). A low corner lifts only the deep sub-bass for rumble and power; a higher corner brings up more of the low end for a fuller, warmer body. The preview updates as you drag, and stereo is preserved on export.
It's the fast way to give a thin recording more punch or make a track hit harder on headphones and earbuds. The catch is restraint: past roughly +9 dB the low end can turn flabby or push the file toward clipping, so a moderate, clean boost beats a heavy one. If you want to shape the mids and highs too, reach for the full graphic equalizer — the bass booster is the same low-shelf filter, just focused on the bottom. More on the low end in what audio frequencies are.
The intensity slider goes up to +15 dB, but you rarely want it near the top. A boost of +3 to +6 dB adds noticeable weight without trouble; past about +9 dB you risk overloading the low end, muddying the mix, or pushing the file into clipping on loud passages. If it starts to sound flabby or distorted, back it off — a cleaner moderate boost almost always sounds better than a heavy one.
It sets where the boost begins. A low corner like 60 Hz lifts only the deep sub-bass, adding rumble and power without touching the punch of the kick. A higher corner like 120 Hz brings up more of the low end, giving a fuller, warmer body to the whole track. Lower corners are cleaner on bass-heavy music; higher ones add warmth to thin recordings.
It's a focused one — a single low-shelf filter, the same kind of filter the low band of the full equalizer uses, dedicated to the low end with a simple intensity and frequency control. If you want to shape the mids and highs too, the graphic equalizer gives you the whole spectrum; the bass booster is the fast way to just add low-end weight.
Small speakers can barely reproduce deep sub-bass, so a boost at the 60 Hz corner may be almost inaudible on a phone or laptop while sounding huge in a car or on good headphones. If the track will mostly be heard on small speakers, pick the 100 Hz or 120 Hz corner instead, which lifts the upper bass those speakers can actually play. Check on headphones too, since a boost that suits tiny speakers can be too heavy on a full system.
No. The intensity slider only goes up, from 0 to +15 dB, because the tool is built for adding weight. To tame a boomy recording or a muddy mix, use the equalizer instead: its 80 Hz low shelf cuts by up to 12 dB, and its 240 Hz band trims the low-mid buildup that often comes across as too much bass. Cuts of 2 to 4 dB are usually enough to hear a clear difference.