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Some songs sound thin on earbuds, in the car or at the gym. Pick a preset or dial in exactly how much low end you want and where it sits, hear it change live, and download the bass-boosted version without the file ever leaving your device.
Processing locally on your device
Overview
The booster uses a low-shelf filter, which lifts everything below a corner frequency by a set number of decibels, from 0 to +18 dB. Where you put the corner changes the character. Around 40–70 Hz it adds the deep sub-bass you feel through headphones and subwoofers; 80–120 Hz gives kick drums and bass guitar more punch; 120–200 Hz is the only bass small speakers can really reproduce.
Phones and laptops roll off steeply below about 150–200 Hz, so boosting 50 Hz on them mostly wastes headroom. The Warmth control solves this a different way: it saturates just the bass band to create overtones, filters out everything except those new harmonics, and mixes them back in. Your ear fills in the missing fundamental, so the bass seems stronger even on speakers that can’t play it. The Tighten lows switch removes inaudible energy under 25 Hz that would otherwise eat into the headroom.
Low frequencies carry most of the energy in modern music, and many tracks are already mastered close to 0 dBFS. A 10 dB bass boost can push peaks far over the limit, which sounds like crackling distortion. The presets lower the output trim as the boost increases, and the limiter catches any peaks left above −2 dB, so heavy settings stay clean. The same Web Audio chain plays the preview and renders the export, so what you hear is what you download.
| Preset | Boost | Frequency | Warmth | Good for |
|---|---|---|---|---|
| Subtle | +4 dB | 100 Hz | 0% | Thin recordings, acoustic music |
| Punchy | +7 dB | 90 Hz | 20% | Pop, rock, earbuds |
| Heavy | +10 dB | 70 Hz | 35% | Hip-hop, EDM, car audio |
| Extreme | +15 dB | 60 Hz | 60% | Bass-boosted meme edits |
Drop in a song or other audio file (videos work too).
Choose Subtle, Punchy, Heavy or Extreme as a starting point.
Press Preview and adjust Boost, Frequency and Warmth while it plays.
Keep the limiter on, or lower the output trim if you turn it off.
Pick a format and bitrate, then export the bass-boosted file.
Use cases
Road noise and big rooms mask the low end. A Punchy or Heavy boost around 70–90 Hz keeps kicks and bass lines audible over engine and treadmill noise.
Pre-boost a few favorite songs so they sound fuller on cheap earbuds without relying on an app’s EQ, which often isn’t available on every device or player.
The Extreme preset adds a big shelf boost with heavy drive for the exaggerated bass-boosted style used in memes and short videos, while the limiter keeps it from collapsing into noise.
Pro tips
Answers to common questions about the bass booster.
Bass has a lot of energy, so boosting it raises the peaks. When peaks pass 0 dBFS they clip, which sounds like crackling. The limiter and the output trim keep peaks below full scale, so leave the limiter on for big boosts.
Try 80–120 Hz for punch and 40–60 Hz for deep rumble on headphones or a subwoofer. On phone or laptop speakers, 120–150 Hz plus some warmth works better, because they can’t reproduce the lowest notes.
It adds harmonics, overtones at two and three times the bass frequency, by gently saturating only the low band. Your brain hears those overtones as bass, so the low end comes through on small speakers without pushing the level up much.
Very large low-frequency boosts played loudly can push small speaker cones too far. If you hear rattling or flapping, turn the playback volume down or use a smaller boost. Tighten lows also helps by removing sub-25 Hz energy speakers can’t use.
No. ToolEnhancer processes files on your own device inside the browser. They are never sent to, stored on or seen by our servers.
Yes. The bass booster is free to use with no sign-up, no watermarks and no daily limits.