Audio Equalizer (10-Band EQ Online)

Shape the sound of a song, podcast or recording with a 10-band graphic equalizer: lift or cut the bass, mids and treble in octave steps from 31 Hz to 16 kHz, or start from a preset such as bass boost, vocal clarity, rock, pop or loudness. The result shows the combined response at each band, and a limiter keeps boosted peaks from clipping. Everything runs in your browser; files are never uploaded.

How to use this tool

1. Choose one or more audio files.
2. Pick a preset, or keep "Use my settings below" and set each band from −12 to +12 dB.
3. Lower the output gain if you boost a lot, and keep the limiter on.
4. Choose the format and press Calculate; compare the RMS and peak before and after.

Formula

Peaking filter (Audio EQ Cookbook): A = 10^(gain ÷ 40), ω₀ = 2π f₀ ÷ fs, α = sin ω₀ ÷ (2Q), Q = 1.41 (about one octave)

The 31 Hz band is a low shelf and the 16 kHz band a high shelf; the eight bands between are peaking filters one octave apart, all Web Audio BiquadFilterNodes (gains in dB) run in an OfflineAudioContext. Neighbouring bands overlap, so raising two neighbours by 4 dB gives more than 4 dB between them; the table shows the real combined response from the filters themselves. If the result would peak above −1 dBFS the limiter (5 ms look-ahead) lowers just those moments; MP3, M4A and other lossy outputs are decoded again to make sure they do not clip.

Example

Raising only 1 kHz by +6 dB (at 44.1 kHz) lifts 1 kHz by exactly 6 dB, 500 Hz and 2 kHz by about 1.1 dB and 250 Hz and 4 kHz by about 0.2 dB. The Vocal / podcast clarity preset lowers 31–125 Hz by about 3–5 dB and lifts 2–4 kHz by about 4 dB, where speech consonants are; the table shows these combined values for your settings.