Add a Chorus Effect to Your Audio Add chorus effect to audio for a thicker, richer sound.

🎵

Audio Chorus Effect

Add chorus effect to audio for a thicker, richer sound.

Upload Audio

Drop your audio file or click to browse.

Adjust Chorus

Set the depth, rate, and mix of the chorus effect.

Download

Download your audio with chorus effect applied.

Loading tool...

What Is Audio Chorus Effect?

The Audio Chorus Effect creates a thicker, richer sound by simulating multiple slightly detuned copies of the original audio played together. The effect works by mixing the original signal with one or more delayed copies whose delay time is modulated by a low-frequency oscillator (LFO). This creates subtle pitch and timing variations that make a single voice or instrument sound like multiple players. Uses the Web Audio API's DelayNode and OscillatorNode for the LFO modulation. Great for enriching vocals, guitars, synths, and any audio source.

Why Use Audio Chorus Effect?

Create rich, thick sound from a single audio source
Adjustable depth, rate, and mix controls
Real-time preview of the effect
Completely browser-based and private

Common Use Cases

Vocal Enhancement

Make solo vocals sound fuller and more present with subtle chorus.

Guitar Effects

Add classic chorus shimmer to guitar recordings.

Synth Pads

Thicken synthesizer pads and lead sounds.

Sound Design

Create lush, animated textures from simple audio sources.

Technical Guide

The chorus effect is implemented using a modulated delay line. A DelayNode is set to a base delay of 20-30ms. An OscillatorNode (LFO) generates a low-frequency sine wave (rate: 0.5-5 Hz) connected to the delay's delayTime parameter via a GainNode (depth: 1-10ms). This modulates the delay time, creating pitch variations as the delay time increases and decreases. The modulated signal is mixed with the dry signal using wet/dry GainNodes. For a stereo chorus, two delay lines with different LFO phases (0° and 180°) are used, one per channel. The processing is rendered through an OfflineAudioContext. The depth parameter controls the modulation amount, rate controls the LFO speed, and mix controls the wet/dry balance. Output is encoded as WAV.

Tips & Best Practices

1
Subtle chorus (low depth, 20-30% mix) adds warmth without being obvious
2
Slower LFO rates (0.5-1 Hz) produce a gentle, sweeping effect
3
Faster rates (3-5 Hz) create a vibrato-like warble effect
4
Chorus works especially well on clean guitar, vocals, and synth pads

Related Tools

Audio Pitch Shifter

Shift the pitch of audio files up or down without changing speed.

🎵 Audio Tools

Audio Equalizer

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

🎵 Audio Tools

Audio Echo Effect

Add echo and delay effects to audio files.

🎵 Audio Tools

Audio Reverb Effect

Add reverb effects to audio files to simulate room acoustics.

🎵 Audio Tools

Frequently Asked Questions

Q What is the chorus effect?

Chorus simulates multiple performers by mixing the original signal with slightly delayed and pitch-modulated copies, creating a thicker, richer sound.

Q What does depth control?

Depth controls how much the delay time varies (pitch modulation amount). More depth = more pronounced pitch variation.

Q What does rate control?

Rate controls the speed of the pitch modulation (LFO frequency). Faster rate = more rapid pitch fluctuations.

Q Is chorus different from reverb?

Yes. Chorus creates a thicker sound by pitch modulation. Reverb simulates room reflections. They serve different purposes but can be combined.

Q Is processing done locally?

Yes. All chorus processing happens in your browser. No files are uploaded to any server.

About This Tool

Audio Chorus Effect 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.