Audio Equalizer

How it works

1. Choose an audio file.
2. Pick a preset or move the band sliders.
3. Listen live and compare with the original.
4. Export and download.

What the ten bands do

The equalizer has ten bands, one per octave from 31.5 Hz to 16 kHz, each adjustable by 12 dB up or down. The low bands (31.5 to 125 Hz) carry rumble and the weight of kick drums and bass. The middle bands (250 Hz to 2 kHz) hold most of the body and the vowels of a voice. The upper bands (4 to 16 kHz) carry presence, consonants and air.

Each band is a peaking filter about an octave wide, so neighbouring bands overlap into one smooth curve. The chart shows that combined curve, and a text description of it is read out to screen readers.

Presets and how to use them

Presets are starting points: Bass boost and Treble boost for a quick tilt, Vocal clarity and Podcast voice to cut rumble and lift presence, Reduce rumble and De-mud to clear low frequencies that cloud a recording, Telephone and Radio for narrow-band effects, and Loudness smile for the familiar lifted lows and highs. After choosing one, move any slider and the preset name changes to Custom.

Small cuts usually sound better than big boosts. If something sounds muddy, cut around 250 Hz instead of boosting everything else. Every boost adds level, which is why the page estimates the loudest possible peak and warns when the result could clip.

Live preview and export

Play live runs two minutes of the file from the playhead through your browser’s own filters, built from the same formulas as the export, so you hear each change as you drag. Preview renders ten seconds through the exact export code and lets you compare it with the original.

The export applies the same ten filters to the whole file. WAV, FLAC and AIFF stay lossless; MP3, M4A and other lossy formats are encoded once more, so choose a high bitrate if you plan to keep editing.

Questions