Audio Equalizer

The Audio Equalizer has ten bands, centred at 31, 62, 125, 250, 500, 1000, 2000, 4000, 8000 and 16000 Hz. Each one has its own gain slider, so the adjustment is a curve rather than a single tone control.

Bypass routes the file straight to the output without the ten filters, so the Audio Equalizer plays the untouched audio. Switching it on and off is the quickest way to check whether a band change helped.

The Audio Equalizer exports 16-bit PCM WAV. It does not export MP3, because no MP3 encoder is used in the browser page; WAV keeps the result lossless, and the exported file carries the current ten band gains.

No. The Audio Equalizer decodes and filters the file in the browser with the Web Audio API. Nothing is sent to a server, and no account or credits are needed for playback or export.

The export is rendered through the same ten bands at the same gains, offline, so the tone matches the preview. The volume slider is a monitoring control and is not applied to the export, so the saved file is not turned down by it.

Boosting several neighbouring bands at once can push the signal past full scale, and a digital file has no headroom above it. The Audio Equalizer applies the gains you set, so it helps to boost one band rather than four, and to pull down a problem band instead of lifting everything around it.

The Audio Equalizer accepts MP3, WAV, OGG, M4A, AAC and FLAC where the browser can decode them, up to 90 MB and 15 minutes. A format the browser cannot decode reports an error instead of failing silently.

The Audio Equalizer works on one file at a time, in the browser, and exports 16-bit WAV only. It cannot restore detail that a compressed source has already lost, its ten bands are fixed rather than free-form, and a browser that cannot decode the file reports an error instead of producing a result.

Audio Equalizer runs in the browser and draws zero credits.