Bass Booster

About Bass Booster

This free tool adds bass to a song. Drop in an MP3 or WAV, pick a preset from Light to Car subwoofer, and press Play. You hear the boosted bass at once, and every change while it plays.

Adding bass makes a song louder, and a song that is too loud distorts (it "clips" and crackles). The clipping guard stops that: it finds the loudest point of the boosted song and turns the whole song down just enough to keep it clean. The page tells you by how many dB.

Everything happens in your browser. Your music is never uploaded.

Features

• Boost from 0 to +20 dB — in half-dB steps
• Six frequencies — boost everything below 40, 60, 80, 100, 150 or 200 Hz
• Five presets — Light, Medium, Heavy, Extreme and Car subwoofer
• Clipping guard — measures the real peak and lowers the volume just enough, so the bass does not distort
• Live preview — you hear each change while the song plays, and that is the file you download
• MP3 or WAV — MP3 from 128 to 320 kbps, or lossless WAV, with one-click download
• Private — no upload, no sign-up, no watermark

The presets

Which frequency should I pick?

The boost is a low shelf: everything below the frequency you pick gets louder, and the rest of the song stays as it was.

• 40–60 Hz — sub bass. The deep rumble you feel more than hear. Good for car subwoofers and big speakers. Phone and laptop speakers cannot play it, so you may hear little change on them.
• 80–100 Hz — punch. The kick drum and the body of the bass guitar. This is the best choice for most songs and most headphones.
• 150–200 Hz — warmth. Makes a thin recording sound fuller. Too much makes it sound muddy.

How much is +6 dB? Every 6 dB doubles the strength of the bass. +20 dB is about ten times as strong — that is a lot, and it is why the clipping guard is on by default.

About the clipping guard

A sound file cannot go above full volume. When the bass pushes the song past it, the tops of the waves are cut off, and you hear crackle. With the guard on, the tool works out the loudest point of the boosted song, sample by sample, and lowers the whole song so that point stays 1 dB under the limit. The bass is still just as strong compared to the rest; the whole song is only a bit quieter.

With the guard off, the volume is not changed, and the page warns you how much of the song will distort. To make a quiet song louder afterwards, use Change Audio Volume.

Common uses

• Car audio — more sub bass for a subwoofer
• Small speakers and earbuds — a little more punch at 80–100 Hz
• Bass boosted songs — the loud, heavy versions people post on YouTube and TikTok
• Thin recordings — warm up a phone recording or an old song at 150–200 Hz
• Workout playlists — more kick drum for a gym speaker

Frequently asked questions

Is it free, and is my song uploaded?

It is free, with no sign-up and no watermark. The bass is boosted in your browser and the file is never sent to a server.

Why does my song get quieter when I add bass?

That is the clipping guard. More bass makes the song's peaks too loud, so the guard turns the whole song down just enough that it does not distort. The bass is still stronger than before compared to the rest of the song. You can turn the guard off, but the song may then crackle.

I cannot hear any difference. Why?

Phone and laptop speakers cannot play deep bass. Try headphones, or pick 100 Hz instead of 40 or 60 Hz.

Is what I hear the same as the file I download?

Yes. The preview and the file use the same bass filter and the same volume. When you change a setting, the file is made again in the background, and the Download button comes back when it is ready.

Can I boost a long song?

Yes. A 5 to 10 minute song works; the page shows the progress while the file is made. Very long files (an hour or more) may be too big for the browser's memory — cut them first with Trim Audio.

Which file types work?

Any audio file your browser can play: MP3, WAV, M4A (AAC), OGG and usually FLAC. The result is saved as MP3 or WAV. To change the format later, use the Audio Converter.

How to use it

• Drop a song on the box, or click it to choose one
• Press Play, then pick a preset — Medium is a good start
• Move the Bass boost slider and pick the frequency while you listen
• Keep the Clipping guard on so the song does not distort
• Choose MP3 or WAV, then press Download