Audio Equalizer

How to equalize an audio file online

Three steps, in your browser.

1. 1

   Drop the file

   A song, a podcast or a voice recording: MP3, M4A, WAV, FLAC and other common formats up to 100 MB and 30 minutes.

2. 2

   Pick a preset and listen

   Start with a preset or move the bands yourself. Press play and switch between Original and Equalized while it plays; every slider move is heard at once, and both sides play at the same loudness.

3. 3

   Apply and download

   The whole file goes through the same filters, is lowered as a whole if it would clip, and is saved as an MP3 at the bitrate you choose or as a 16-bit WAV. The page tells you the peak and how much it lowered.

What each band does

These ranges are rules of thumb: real sounds spread over several bands, and sources draw the lines a little differently.

What the presets do

Each preset is a starting point. Its total effect at four frequencies, computed with the Web Audio filter formulas at 48 kHz:

What it does and what it does not do

• Ten bands an octave apart

  Each band is a peaking filter about one octave wide, up or down by 12 dB. Neighbouring bands overlap, so the curve under the sliders shows what they add up to.

• Clipping protection

  Raising a band adds level. If the loudest moment would go past the top of the scale and distort, the page lowers the whole file just enough to keep the peak at -1 dB and tells you by how much. That is why a file can come out a little quieter.

• A fair comparison

  Louder tends to sound better at first, so the player plays both versions at the same loudness by default. Turn Match loudness off to hear the file as it will be saved.

• Not a system equalizer

  This page changes one file you give it. It cannot reach the sound of YouTube, Spotify, a game or your whole computer. For one browser tab you need a browser extension, and for everything your computer plays, a system audio app.

When each preset helps

• Voice clarity

  For a talk or a phone recording: it takes out the lowest bands, dips a little around 250 Hz and lifts 2 to 4 kHz, where consonants sit. It helps words stand out; it does not remove background voices.

• Reduce rumble

  For the low hum of traffic, air vents or a hand on the phone. It cuts the bands below about 125 Hz and leaves the rest. If there is music with real bass in the file, the bass goes too.

• Reduce hiss

  It lowers the top bands where hiss is loudest, and any real treble goes with it, so the file also gets duller. For steady noise under a voice, the Audio Enhancer is the better tool.

• Use your own files

  Edit recordings you made or have the right to change. Copy-protected audio will not open here.