Equalizer

How to Use

1. Click the area above to select a file, or drag and drop a file onto the page
2. Adjust parameters in the settings area
3. Click the process button and download the result when ready

Frequently Asked Questions

How It Works

The Equalizer uses Web Audio API BiquadFilterNode to implement a multi-band parametric equalizer that adjusts specific frequency ranges in audio. The tool creates a chain of filter nodes, each targeting a different frequency band.

Each BiquadFilterNode is configured with a filter type (lowshelf, peaking, highshelf), center frequency (Hz), gain (dB), and Q factor (bandwidth). The peaking filter boosts or cuts a specific frequency band, while lowshelf and highshelf filters affect all frequencies below or above their cutoff point.

The presets (Bass Boost, Treble Boost, Vocal, Rock, Pop) are pre-configured combinations of these filter parameters. The audio passes through the filter chain in real-time using the Web Audio API's AudioWorklet, which processes audio on a dedicated audio thread for glitch-free performance. The processed output is rendered to a new audio file using OfflineAudioContext.

Tips & Best Practices

• Subtle boosts are key: 3-6dB changes are usually enough. Larger boosts can make audio sound unnatural and introduce resonance.
• Bass Boost for voice: A gentle low-end boost (100-300Hz) adds warmth and presence to podcast and voice recordings.
• Treble Boost for clarity: Boosting 3-6kHz enhances speech intelligibility, making voices clearer and more present.
• Start with presets: The built-in presets are expertly tuned starting points — fine-tune from there rather than building from scratch.
• A/B comparison: Toggle the EQ on and off frequently to ensure your changes are actually improving the sound.
• Cut before boost: It's often better to cut problematic frequencies than to boost desired ones — this preserves headroom.

Use Cases

Podcast producers applying bass boost to add warmth to thin-sounding voice recordings and treble boost for enhanced speech clarity.

Music producers shaping the tonal balance of individual tracks in a mix — boosting snare punch at 200Hz, adding vocal presence at 3kHz. Video editors improving dialogue clarity in noisy field recordings by cutting low-end rumble and boosting speech frequencies. Audio engineers applying corrective EQ to compensate for room acoustics in untreated recording spaces. Live streamers enhancing their microphone audio in real-time for clearer, more professional broadcast quality. ASMR creators boosting high frequencies to enhance subtle texture sounds in their recordings.

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