Audio Equalizer Apply EQ adjustments to boost or cut frequency bands in audio.

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Audio Equalizer

Apply EQ adjustments to boost or cut frequency bands in audio.

Upload Audio

Drop your audio file or click to browse.

Adjust EQ

Move the sliders to boost or cut specific frequency bands.

Download

Download your EQ-adjusted audio file.

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What Is Audio Equalizer?

The Audio Equalizer lets you adjust the frequency balance of any audio file using a multi-band EQ interface. Boost bass frequencies for more punch, cut muddy mid-range, or enhance treble clarity — all from your browser. The tool provides a 10-band graphic equalizer using the Web Audio API's BiquadFilterNode, covering the full audible frequency spectrum from 32 Hz to 16 kHz. Preview your adjustments in real-time and download the processed audio. Includes preset EQ curves for common scenarios like bass boost, vocal clarity, and treble enhance.

Why Use Audio Equalizer?

10-band graphic equalizer covering 32 Hz to 16 kHz
Preset EQ curves for common adjustments (bass boost, vocal clarity, etc.)
Real-time preview of EQ changes
All processing in your browser — files stay private

Common Use Cases

Music Enhancement

Enhance the bass, mids, or treble of music recordings.

Voice Clarity

Boost speech frequencies and cut background rumble for clearer voice recordings.

Podcast Post-Production

Apply EQ to improve the tonal balance of podcast episodes.

Audio Restoration

Cut problematic frequencies like hum (50/60 Hz) or harshness.

Technical Guide

The equalizer uses a chain of BiquadFilterNodes from the Web Audio API, each configured as a "peaking" filter type. The 10 bands are centered at standard ISO frequencies: 32, 64, 125, 250, 500, 1k, 2k, 4k, 8k, and 16kHz. Each band has an adjustable gain parameter (±12 dB) and a fixed Q (quality factor) value that determines bandwidth. The filter chain is connected in series: source → filter1 → filter2 → ... → filter10 → destination. For processing, an OfflineAudioContext renders the full audio through the filter chain. Presets are implemented as predefined gain arrays for the 10 bands. The frequency response is visualized using BiquadFilterNode.getFrequencyResponse() to plot the combined EQ curve on a canvas.

Tips & Best Practices

1
Cut frequencies more than you boost — this generally produces cleaner results
2
Use the "Vocal Clarity" preset as a starting point for speech audio
3
The Bass Boost preset works well for music played on small speakers
4
Small EQ adjustments (2-4 dB) usually sound more natural than extreme changes

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Frequently Asked Questions

Q What is a graphic equalizer?

A graphic EQ provides sliders for fixed frequency bands, letting you boost or cut each band independently to shape the overall tonal balance.

Q What frequency range is covered?

The EQ covers 32 Hz to 16 kHz across 10 bands, spanning the full range of human hearing.

Q Can I save my EQ settings?

You can use the presets or remember your slider positions. The settings aren't persisted between sessions.

Q What does Q factor mean?

Q (quality factor) determines how wide each EQ band is. A higher Q affects a narrower frequency range.

Q Is the processing done locally?

Yes. All EQ processing happens in your browser. No audio files are uploaded.

About This Tool

Audio Equalizer is a free online tool by FreeToolkit.ai. All processing happens directly in your browser — your data never leaves your device. No registration or installation required.