Shape the sound of any audio file with a 10-band graphic equalizer. Start from a preset such as Bass boost, Vocal boost or Podcast, fine-tune each band while it plays, compare with the original and download the result as MP3 or WAV. Your audio stays on your device.
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How to use the Audio Equalizer
Open your audio: drop an MP3, WAV, M4A, OGG or FLAC file on the box or click to choose one.
Pick a preset such as Bass boost or Vocal boost as a starting point.
Fine-tune: press Play preview and move the band sliders, or drag the dots on the graph, until it sounds right.
Compare: press the EQ on / Original switch (or the B key) to hear the difference.
Download: choose MP3 or WAV and press Download equalized audio.
Equalizer frequency guide
The ten bands sit one octave apart, so each band covers twice the frequency of the band to its left. Use this chart to find the slider that controls the sound you want to change.
Band
Range it affects
Boost to
Cut to
31 Hz
Sub-bass
Feel deep rumble and sub drops
Remove wind noise and rumble
62 Hz
Bass, kick drum
Add punch and weight
Clean up boomy recordings
125 Hz
Upper bass
Add fullness, best bass band for small speakers
Reduce boominess in voices
250 Hz
Low mids
Add warmth
Remove muddiness
500 Hz
Mids
Add body to thin instruments
Reduce a boxy or hollow sound
1 kHz
Mids
Push instruments forward
Soften a nasal tone
2 kHz
Upper mids
Improve speech intelligibility
Reduce harshness
4 kHz
Presence
Add clarity and attack
Tame piercing vocals
8 kHz
Brilliance
Add crispness
Reduce sibilance (“s” sounds)
16 kHz
Air
Add sparkle and openness
Reduce tape hiss and noise
How the equalizer works
Each band is a second-order peaking filter (the biquad “bell” from the Audio EQ Cookbook) centred on its frequency, with a quality factor Q = √2 ≈ 1.41, which corresponds to a bandwidth of one octave. The total response is the sum of all bands in decibels, shown by the green curve. A gain of +6 dB doubles the amplitude in that range; −6 dB halves it.
When you boost, the loudest parts of the file can exceed 0 dBFS, the digital maximum, which causes clipping distortion. With Prevent clipping on, the tool applies a preamp equal to minus the highest point of the curve, the same approach used by many software and car-audio equalizers, and also scales the final file down if any peak would still go over the limit.
Tips for better results
Cut before you boost. Lowering a problem frequency usually sounds more natural than boosting everything else.
Use small moves. 2 to 4 dB changes are often enough. Large boosts make audio louder, which our ears mistake for “better”, so use the A/B switch at a similar volume.
Listen on the target device. Bass that sounds great on headphones may be inaudible on a phone speaker.
Frequently asked questions
What does each equalizer band do?
Each slider raises or lowers a one-octave range around its frequency. 31 and 62 Hz are sub-bass and kick-drum thump, 125 and 250 Hz give warmth and body (too much sounds muddy), 500 Hz to 2 kHz hold most of the voice and instruments, 4 kHz adds presence and clarity, and 8 to 16 kHz add air and sparkle (too much sounds harsh or hissy).
How do I boost the bass?
Choose the Bass boost preset, which raises 31 to 250 Hz with the most lift at the lowest bands, or raise the 62 and 125 Hz sliders yourself. Keep Prevent clipping on so the boost does not distort. Small laptop and phone speakers cannot reproduce much below about 100 Hz, so boost 125 Hz for them.
What is the best EQ setting for voice or podcasts?
Cut the low end (31 to 125 Hz) to remove rumble and handling noise, and add 2 to 3 dB around 2 to 4 kHz for clarity. The Podcast / speech preset does exactly that. If the voice sounds harsh or sibilant, lower 8 kHz a little.
Why does the audio get quieter when I boost bands?
With Prevent clipping on, the tool lowers the overall level by the size of the biggest boost (the auto preamp). Without it, boosted frequencies can push the waveform above full scale, which causes harsh distortion. You can raise the Output gain slider if the result is too quiet, or use an audio normalizer afterwards.
Is my audio uploaded?
No. The equalizer uses the Web Audio API's filters in your browser, and the MP3 is encoded with a JavaScript build of the LAME encoder on your device. Nothing is sent to a server.
What kind of filters does this equalizer use?
Each band is a peaking (bell) filter with a Q of about 1.41, which gives a bandwidth of one octave, the same layout as a classic 10-band hardware graphic equalizer. The export is processed with exactly the same filters you hear in the preview.