Boost the bass, tame the treble or bring a voice forward with a 10-band equalizer
Processed in your browser. Nothing is uploaded. Checked against sources on 22 Oct 2026.Audio Equalizer changes the balance of an audio file across 10 bands from 31 Hz to 16 kHz, each up to 12 dB louder or quieter, with presets for bass, treble and voice. You hear the change live before saving, and the file is processed in your browser and saved as WAV, FLAC, M4A or Opus.
Press Choose an audio file or drop an MP3, M4A, WAV, OGG or FLAC; it is decoded on your device.
Pick a preset such as Bass boost or Vocal, or drag the ten band sliders from −12 to +12 dB.
Press Play and switch between Equalized and Original to hear the difference as you adjust.
Choose WAV, FLAC, M4A or Opus, press Equalize, then Download.
An equalizer turns some frequencies up and others down. A song that sounds thin on laptop speakers needs more bass; a voice recorded next to traffic needs less rumble; a podcast that sounds muffled needs a little presence around 2 to 4 kHz.
Ten bands, an octave each. The sliders sit at the standard octave centres: 31, 63, 125, 250 and 500 Hz, then 1, 2, 4, 8 and 16 kHz. Each one is a peaking filter one octave wide, so moving the 125 Hz slider by 6 dB changes 125 Hz by exactly 6 dB and its neighbours progressively less. The curve under the sliders shows the combined result.
Presets. Bass boost, Bass cut, Treble boost, Treble cut, Vocal, Loudness and Podcast voice set all ten sliders at once. Start from one and adjust.
Hear it first. Press Play and switch between Equalized and Original while you move the sliders. While you boost, playback is turned down by the largest boost, so the preview cannot distort and the comparison is about tone rather than volume.
No clipping. Boosting can push peaks past full scale, which sounds like crackle. If that would happen, the saved file is lowered as a whole just enough to peak at −0.3 dBFS, and the page tells you by how many dB.
Formats. WAV is exact and large. FLAC is exact at about half the size. M4A and Opus are small and are encoded by your browser; Safari has no Opus encoder, and the page says so rather than guessing.
Private. The file is decoded and filtered inside this page on your own device. Nothing is uploaded, and no account is needed.
Limits. Files up to 300 MB and one hour are accepted. The 16 kHz band is skipped for files sampled at 22,050 Hz or less, because they carry nothing that high.
Drop the song on Audio Equalizer and press the Bass boost preset, which raises everything below 250 Hz by up to 6 dB. Press Play to compare it with the original, raise the 31 and 63 Hz sliders for more, then press Equalize and Download. A boost that would clip is lowered automatically.
Low rumble from traffic, wind or air conditioning sits below about 125 Hz, so the Bass cut or Podcast voice preset removes most of it. Mains hum at 50 or 60 Hz is a narrow tone; the 63 Hz band reduces it, though a dedicated notch filter would remove it more precisely than an octave-wide band.
Playback is turned down by the largest boost so the preview never distorts. Without that, a 9 dB bass boost would crackle on loud passages and make the comparison about volume instead of tone. The saved file is only lowered if it would actually clip, by as little as needed.
Choose FLAC to keep the result exact at about half the size of a WAV, or WAV for the widest compatibility with editors. M4A and Opus are much smaller and fine for a phone or a podcast host. Opus needs Chrome, Edge or Firefox 130 or later; Safari cannot encode it.
No. The file is decoded by your browser and every filter runs inside this page on your own device, so nothing is sent to a server and nothing is kept. Closing the tab removes the decoded audio from memory. No account or app is needed.
Each number is the centre frequency of a band in hertz: 31 and 63 are deep bass, 125 to 500 are the body of most instruments and voices, 1k to 4k carry speech clarity, and 8k and 16k are air and sparkle. Every slider moves its band between 12 dB quieter and 12 dB louder.
Rates and rules change; check the source before you rely on a figure.
Still stuck? Ask about Audio Equalizer and anybody who knows can answer. No account needed.
Same job, other tools: Frequency Generator – Generate a steady test frequency for speakers, headphones or instruments · Sweep Tone Generator – Sweep smoothly between two frequencies over a time you choose · Audio Sweep Generator – Play a slow logarithmic sweep and hear every rattle in the room · Headphone Frequency Test – Hear where your headphones stop, by ear rather than by chart.
On the related tools: Mic Test – See your voice on a live waveform and hear it played straight back.