Bass Booster & Equalizer

Boost the bass or shape the sound with a 10-band equalizer, hear it live, and save it. The file stays on your device.

How to boost the bass of a song

Three steps, in the browser.

Choose the song

Drop an audio or video file of up to 2 GB: MP3, WAV, M4A, FLAC, MP4 and more.

Set the bass and listen

Pick a preset or move the bass slider (up to +12 dB); open the equalizer for all 10 bands. Play the preview while you adjust.

Save it

Apply and download MP3, WAV or M4A, or send the result to the volume booster or the trimmer.

What each frequency range does

Where to boost or cut for the sound you want.

20–60 Hz	Sub-bass: the rumble you feel more than hear. Small speakers can't play it.
60–250 Hz	Bass: kick drum and bass guitar weight. The usual "bass boost" range.
250–500 Hz	Low mids: warmth, or muddiness if there is too much.
500 Hz–2 kHz	Mids: the body of voices and most instruments.
2–6 kHz	Presence: clarity of voices, attack of guitars and snares.
6–20 kHz	Treble and air: cymbals, breath and sparkle.

What the bass booster does

Bass in one slider

Up to +12 dB, shaped across 32–250 Hz so the low end grows without muddying the mids.

Full 10-band EQ

Bands from 32 Hz to 16 kHz, ±12 dB each, plus presets for bass, vocals, treble and loudness.

Hear it before saving

The preview plays the file through the same filters the saved file gets, live as you move the sliders.

No distortion

The volume is lowered by the biggest boost and a limiter holds the peaks, so heavy bass doesn't crackle.

MP3, WAV or M4A

MP3 at 192 kbps, 16-bit WAV up to 30 minutes, or M4A; video files give their sound.

Stays on your device

The file is processed in your browser. Nothing is uploaded and there is no account.

Bass booster FAQ

Bass, equalizer, distortion and privacy.

How do I boost the bass of a song?

Choose the song, pick a bass preset or move the Bass boost slider, play the preview, then press Apply and save. The file is processed on your device.

How much bass boost should I use?

+3 to +6 dB is noticeable and clean on most speakers; +9 dB and more is for car systems and headphones. Listen to the preview and stop when the kick and bass start to blur.

Will boosting the bass distort the sound?

Not with Avoid distortion on (the default): the volume is lowered by the biggest boost and a limiter keeps peaks below clipping. The result can sound a little quieter; the volume booster can bring it back up.

What does each equalizer band do?

32 and 64 Hz are sub-bass, 125–250 Hz the punch of the bass, 500 Hz–2 kHz the body of voices, 4 kHz clarity and 8–16 kHz treble and air. The table on this page explains each range.

Why can't I hear the extra bass on my phone?

Phone and laptop speakers barely play below about 100 Hz. Listen with headphones or a proper speaker, or boost 125 Hz a little more.

Can I use it as an equalizer for vocals or treble?

Yes. Use the Vocal or Treble presets or open the equalizer and set any of the 10 bands from −12 to +12 dB.

Which formats can I open and save?

Most audio and video files up to 2 GB open. You can save MP3 (192 kbps), WAV (up to 30 minutes) or M4A.

Is my file uploaded?

No. The audio engine (ffmpeg) runs in your browser and the preview uses your browser's own audio filters; the file never leaves your device.