Use the free Audio Equalizer Exporter below: your data never leaves your browser — all work happens on your device, and nothing is uploaded to any server.
What an equalizer actually does to sound
Every sound you hear is a mix of low, middle and high frequencies played at once. A bass drum lives down low, a voice lives mostly in the middle, and the hiss of a hi-hat or the air in a recording lives up high. An equalizer is just a set of volume knobs, one for each slice of that range. Turn up the low slice and the bass gets stronger. Turn down the high slice and the harshness softens. Nothing is added that was not already in the recording. You are only deciding which parts of the existing sound get more room and which get less.
That is why EQ feels like magic the first time you use it well. A muddy voice recording often has too much low rumble from a desk or a fan. Cutting a little at 100 Hz clears it up without touching the voice itself. A dull music track often needs a gentle lift around 4000 Hz to bring back the sparkle. The changes are small, usually just a few decibels, but your ear notices them immediately, because it is very sensitive to balance between frequency ranges.
The five bands in this tool
This equalizer has five bands, which is enough to fix most everyday problems without overwhelming you. The 100 Hz band is a low shelf: it lifts or cuts everything below that point, so it controls rumble, boom and warmth. The 400 Hz band is a peaking band for low mids, where muddiness and boxiness live. The 1000 Hz band covers the core of most voices. The 4000 Hz band covers presence and clarity, the part that makes speech easy to understand. The 10000 Hz band is a high shelf for air and hiss. Move one slider at a time and listen. If you move all five at once, you will never learn which one fixed the problem.
Start from flat, meaning every slider at zero, and make one change, then play the result. A good rule is to cut before you boost. If a recording sounds boomy, cut the lows instead of boosting everything else. Cutting leaves more headroom, so the file is less likely to clip. Boosting is fine too, but a 15 decibel boost on a loud file can push peaks over the ceiling, which is why this tool warns you about it and shows the peak before and after.
How to use it on voice and on music
For a voice recording, try this order. First cut a little at 100 Hz if you hear rumble. Then add a small lift at 4000 Hz if the voice sounds muffled. Leave the middle bands alone unless something specific bothers you. For music, the same patience applies. A track that sounds thin may need a gentle low shelf lift. A track that sounds harsh may need a small cut at 4000 Hz. There is no universal preset that works for every file, because every recording was made in a different room with a different microphone. Your ears, listening to your file, are the preset.
Upload the file, move the sliders, press Apply EQ, and play both versions. The tool keeps the original and the processed version separate, so you can compare them honestly. When you are happy, download the WAV. That WAV really contains the EQ, because the filters run through an offline render of the audio, not just a preview trick. You can drop it straight into a video editor or a podcast project.
Mistakes beginners make with EQ
The most common mistake is boosting everything. If every band is at plus 10, you have not shaped the sound at all, you have just made it louder, and probably clipped it. The second mistake is EQing on bad speakers. Laptop speakers hide the bass completely, so people over-boost the lows and then wonder why the file booms in a car. Use headphones if you can. The third mistake is fixing a bad recording with EQ instead of re-recording. EQ can reduce rumble and tame harshness, but it cannot remove echo, and it cannot make a distant voice sound close. Use it for balance, not rescue.
Common questions
Does EQ change the file length or pitch? No. It only changes the balance of frequencies, so timing and pitch stay exactly the same. Can I use the exported WAV anywhere? Yes, WAV is the standard uncompressed format, and every editor accepts it. Is my file uploaded? No. Decoding, filtering and exporting all happen in your browser, on your device.