About the Audio Equalizer
Shape the sound of any recording with a 10-band equalizer: boost the bass of a song, cut the boom from a voice recorded too close to the mic, add clarity to dull speech, or tame harsh treble. Move the bands from −12 to +12 dB or start from a preset, and download the result.
The equalizing runs in your browser, so the file is never uploaded. Any audio file works, as well as the sound of videos, up to 100 MB.
How it works
Each band is a peaking filter centred on its frequency, from 31 Hz (deep bass) to 16 kHz (air). A band set to +6 dB makes sound at exactly its centre frequency twice as strong in level, and affects neighbouring frequencies less and less within about an octave either side.
Bands left at 0 dB aren't applied at all, so they change nothing. Bands at or above half the file's sample rate can't hold any sound in that file and are skipped automatically.
Boosting can push loud peaks past the maximum level. With Prevent distortion on, a limiter holds those peaks just below −1 dB; everything quieter gets the full boost.
Assumptions and limits
- Ten fixed bands at 31, 62, 125, 250 and 500 Hz and 1, 2, 4, 8 and 16 kHz, each one octave wide.
- Each band from −12 to +12 dB in 1 dB steps.
- MP3, M4A and OGG are saved at 192 kbps; WAV and FLAC keep every detail.
Worked examples
More bass for small speakers
The Bass boost preset adds 6 dB at 31 Hz, sloping down to 2 dB at 250 Hz, so the low end comes through on phones and laptops.
A muddy voice recording
Clearer voice cuts 62 to 250 Hz and lifts 1 to 4 kHz, where the consonants that make speech easy to follow sit.
Mains hum
Pulling the 62 Hz band down to −12 dB reduces the 50 or 60 Hz hum from a nearby power cable.
How to use the Audio Equalizer
- Add the sound to shape. Any audio or video up to 100 MB.
- Move the bands. Or start from Bass boost, Clearer voice and more.
- Export the new sound. Listen on the page, then download.
Frequently asked questions
How do I boost the bass of an MP3?
Choose the MP3, pick the Bass boost preset or raise the 31, 62 and 125 Hz bands, leave Prevent distortion on, and press Apply the EQ. The new MP3 is made in your browser in a few seconds.
Which frequencies should I change?
31 to 125 Hz is bass and rumble, 250 to 500 Hz is warmth or muddiness, 1 to 4 kHz is presence and clarity of voices, and 8 to 16 kHz is brightness, hiss and sibilance. Small changes of 2 to 4 dB are often enough.
How can I make a voice recording clearer?
Use the Clearer voice preset: it reduces the low bands that make voices boomy and lifts the 1 to 4 kHz range where speech is most intelligible. If the recording is hissy, also lower the 8 and 16 kHz bands a little.
Why does boosting sometimes make audio distort?
Boosting raises the peaks too, and digital audio can't go above full scale. If they would, they are clipped and crackle. The limiter here holds such peaks just below −1 dB so the boost stays clean.
Does the equalizer change the volume?
Only in the bands you move. Boosting bands makes the file louder overall and cutting them makes it quieter; the volume booster or normalizer can bring the overall level back afterwards.
This tool runs entirely in your browser. What you enter or upload stays on your device and is never sent to our servers.