Equalizer
Equalizer gives you six bands from sub-bass to air, and plays the file through them as you move the sliders — so you hear the change before you commit to it. Export applies the same settings and saves the result.
Add your audio file
The file is read by your browser and stays on your device — there is no upload step.
Your audio
The work runs in this tab. Nothing is sent anywhere, and the download is generated locally.
Output —Load audio
Your audio stays on your device.
The live preview runs through your browser's own audio engine, and the export runs an encoder compiled to WebAssembly in this tab. The file is not uploaded at either stage.
Learn how files are processed →- Bands
- 60 Hz · 170 · 350 · 1k · 3.5k · 10k
- Range
- −12 dB to +12 dB per band
- Preview
- Live, matched to the export
- Output
- Same format as the source
How to use Equalizer
- 01Upload
Load a track
Drop in an MP3, WAV, M4A, OGG or FLAC file.
- 02Customize
Move the sliders and listen
Press play and adjust. The preview is live, so the sound changes as you drag.
- 03Process
Export
The exported file uses exactly the settings you heard.
What an equaliser is for
An EQ turns particular frequency ranges up or down. It is the right tool when something sounds boomy, boxy, harsh or thin — problems level control cannot touch.
Reducing the offending range almost always sounds more natural than boosting everything else. Cuts are forgiving; boosts add noise and can push the signal into clipping.
Which band for which complaint
- Rumble and thumpsbelow 80 Hz
Traffic, air conditioning, desk knocks. On a spoken-word recording almost nothing useful lives here — a high-pass filter is often a free improvement.
- Boxy or muddy200–500 Hz
The range that builds up in small untreated rooms. A gentle cut here clears up more voice recordings than any other move.
- Harsh and sibilant5–8 kHz
Where hard S sounds live. A narrow cut tames them; a broad one makes the whole recording sound dull.
Signs you have pushed too far
It sounds like a telephone — Too much cut at both ends leaves only the middle. Speech becomes clear but lifeless.
New noise appeared — Boosting a range raises whatever noise was already in it. A big treble boost brings up hiss you could not previously hear.
It only sounds right on your headphones — Heavy EQ tuned on one pair of speakers rarely travels. Check on a phone speaker before committing.
This is baked into the export
Frequencies cut hard are gone from the exported file. Boosting them back afterwards raises noise rather than restoring content.
EQ judgements change once you hear the result in context. Always work from the untouched recording.
Supported formats
- MP3
- WAV
- M4A
- OGG
- FLAC
- Maximum file size —
- bounded by your device's memory
- Processed by —
- FFmpeg (WebAssembly), on your device
Your file, and what the page does
Your file is never uploaded. Equalizer reads it into this browser tab and processes it with FFmpeg compiled to WebAssembly on your own device. There is no upload endpoint in the application and no copy on any server — closing the tab discards it.
That is also why processing takes longer here than on a site that uploads: your device is doing the work rather than a rack of servers. The trade is that the file never leaves it.
What the page does send or fetch
- The processing engine, once
- The first time you use any video or audio tool, the browser downloads the FFmpeg WebAssembly build (~30MB) from the jsDelivr CDN and reuses the cached copy afterwards. That is a file coming to you — no part of your own file is in the request.
- Ads on the page
- The site is funded by advertising, so the page loads Google AdSense. That carries the usual web basics — IP address, browser, referring page — as on any ad-supported site.
- An anonymous usage counter
- When Equalizer finishes we record that the tool ran, whether it succeeded and how long it took. No file data, no identifier, no cookie.
Your file is not on that list. How this works.
Frequently asked questions
Roughly: 60 Hz is weight and rumble, 170 Hz is bass, 350 Hz is warmth and — when overdone — mud, 1 kHz is body and the core of a voice, 3.5 kHz is presence and clarity, 10 kHz is air and sibilance.
Because both use a peaking filter at the same frequency with the same Q. The preview runs in your browser's audio engine, the export runs the same shape through the encoder — so what you hear is what you get.
Boosting adds level, and a track that was already close to maximum has no headroom left. Cut the band you dislike instead of boosting the one you want; it achieves the same balance without raising the peak.
It can improve balance, not add information. If a voice was recorded through a phone in a hard room, EQ can reduce the boom and lift the clarity, but it cannot recreate detail that never reached the microphone.
Yes. The audio has to be decoded, filtered and encoded again, so a lossy source loses a little more. Exporting to WAV or FLAC avoids further loss if you plan to keep editing.
A gentle cut around 350 Hz and a small lift around 3.5 kHz makes most voice recordings clearer. Start with 2–3 dB; EQ moves are usually smaller than people expect.
Yes — Equalizer is completely free. There's no account, sign-up, watermark or limit.
No. It runs in any modern browser — Chrome, Edge, Safari, Firefox, Brave — with nothing to download or install.
Not sure an equaliser is what you need?
- Muddy, boomy or harshEqualizer
- Simply too quietNormalize Audio
- You want the vocal goneVocal Remover
- Long silences between speechRemove Silence
Make it sound the way you meant it to
Load a track, move the sliders, and listen before you commit.
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