Bass Booster
Boost the bass of any song online — deep sub-bass, punch and clarity from a single slider. Preview instantly in your browser, then export from the Audio Studio.
KeyPitch is a browser-based bass booster — no app, no plugin, no account. Drag the slider from Warm to Heavy and hear the low end come up straight away, without the distortion you get from cranking an EQ. Open the Audio Studio to keep going: change the key or pitch, slow the song down, add reverb or 8D audio, then export your bass boosted track as MP3, WAV, M4A or MP4.
Frequently Asked Questions
Everything you need to know about boosting the bass of a song or a video.
A bass booster raises the level of the low frequencies in a track — the kick drum, the bassline and the sub-bass you feel more than hear. KeyPitch boosts three bands at once: sub-bass around 80 Hz for weight, punch around 120 Hz for body, and a small cut in the low mids so the result stays clear instead of muddy.
Upload your MP3, WAV, M4A or MP4, then drag the Bass Boost slider from Off up to Warm, Punchy or Heavy. You hear the change instantly in the preview. When it sounds right, click Download and your track opens in the KeyPitch Audio Studio, ready to export as MP3, WAV, M4A or MP4.
Not when it is done properly. Bass boosting adds gain to the low end rather than removing anything, and KeyPitch runs a limiter after the boost so the track never clips or distorts. Extreme settings on an already bass-heavy song can sound bloated, which is why there are four calibrated levels instead of an unlimited slider.
At normal listening levels, no. What damages drivers is sustained high volume, not bass boost in itself. If you boost heavily, turn the overall volume down slightly to compensate. Small phone speakers and cheap earbuds cannot reproduce deep sub-bass at all, so they will sound louder rather than deeper.
Roughly 20 to 250 Hz. Sub-bass sits between 20 and 60 Hz and is felt more than heard, bass proper runs from about 60 to 250 Hz and carries the kick and the bassline, and the low mids from 250 to 500 Hz are where a track starts to sound muddy. KeyPitch lifts the first two and gently trims the third.
When the vocals start to sound buried, when the kick loses its snap, or when the track sounds boomy on a good pair of headphones, you have gone too far. Warm suits most songs, Punchy works well for hip-hop and electronic music, and Heavy is for when you really want the low end to dominate.
An equalizer gives you a band for every frequency and expects you to know what to do with them. A bass booster is a preset: it moves several bands at once in a way that is known to work. KeyPitch is the second kind — one slider, four levels, tuned so the bass comes up without the mud.
Yes. Upload the MP3, pick a level, preview, then export. The export keeps the format you started from, so an MP3 comes back as an MP3 — upload a WAV, M4A or MP4 instead and you get that same format back. The original file on your device is never modified.
Yes. Upload an MP4 and only the audio is processed — the picture stays untouched and you download the complete video with its new low end. Useful for gaming clips, trailers, edits and social videos that need more weight.
Yes. This page runs in any modern mobile browser on iPhone or Android, with nothing to install. Bear in mind that phone speakers cannot reproduce sub-bass, so plug in headphones or use a decent speaker to judge the result.
Uploading, boosting and previewing is completely free and needs no account. You only pay to export the finished file from the Audio Studio: per export, as a discounted pack of exports, or with a subscription that unlocks unlimited exports.
Exactly like this: a low-shelf boost on the sub-bass, a lift around 100–150 Hz for punch, and a limiter to stop the peaks from clipping. Many creators also slow the track down slightly. You can do both here — boost the bass on this page, then add speed and reverb in the Audio Studio.
Yes, that is what the built-in limiter is for. It sits after the bass stage and holds the peaks down, so even at the Heavy setting the track stays clean. If you still hear crackle, it is usually a source file that was already clipped, or a playback volume that is simply too high.
Yes, and it is one of the most common uses. Export a boosted version and play it from a USB stick or your phone. Car systems already emphasise the low end, so Warm or Punchy usually sounds better in a car than Heavy.
Not with this page, which works on files you upload. The free KeyPitch Chrome extension does add live pitch and speed control on YouTube, and for a permanent bass boosted copy you can process your own file here.
Everything else KeyPitch does: shift the key by up to ±12 semitones, fine-tune the pitch in Hz, change the speed without changing the pitch, add reverb, switch on 8D audio, or separate the vocals from the instrumental with AI. Preview it all free, then export as MP3, WAV, M4A or MP4.