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Brown Noise Generator Generate brown (Brownian) noise for deep relaxation and sleep.

Brown Noise Generator illustration
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Brown Noise Generator

Generate brown (Brownian) noise for deep relaxation and sleep.

1

Click Play

Press the Play button to start generating brown noise.

2

Adjust Volume

Set a comfortable volume level with the slider.

3

Set a Timer

Choose a timer duration to automatically stop playback while you sleep or study.

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What Is Brown Noise Generator?

The Brown Noise Generator creates continuous brown (Brownian) noise directly in your browser. Brown noise has more energy in lower frequencies compared to white noise, producing a deep, rumbling sound similar to a waterfall, strong wind, or ocean waves. Named after Robert Brown (Brownian motion), not the color, brown noise decreases in power at 6 dB per octave as frequency increases. Many people find it more soothing than white noise for sleep and relaxation. Generated algorithmically using random walk principles — no audio streaming needed.

Why Use Brown Noise Generator?

  • Deep, soothing sound preferred by many for sleep
  • Algorithmically generated — no streaming or downloads
  • Adjustable volume with smooth transitions
  • Optional timer for automatic shutoff

Common Use Cases

Sleep

Fall asleep to the deep, soothing rumble of brown noise.

Deep Focus

Create a calm, immersive focus environment for deep work.

Anxiety Relief

Use the low-frequency sound for calming and stress relief.

Sound Masking

Mask low-frequency environmental sounds like traffic rumble.

Technical Guide

Brown noise is generated using a Brownian motion (random walk) algorithm. Starting from 0, each successive sample is calculated as: nextSample = previousSample + (Math.random() * 2 - 1) * 0.02. This creates a signal where each sample is only slightly different from the previous one, naturally producing more low-frequency content. The result is then normalized to prevent clipping by tracking the running maximum and scaling accordingly. The power spectrum follows a 1/f² distribution (-6 dB/octave slope), meaning bass frequencies are much louder than treble. A 2-second AudioBuffer is filled with brown noise samples and played in a loop via an AudioBufferSourceNode. A GainNode provides volume control with smooth ramping. The timer feature schedules automatic fadeout and stop.

Tips & Best Practices

  • 1
    Brown noise is often preferred over white noise for sleep — it sounds "warmer"
  • 2
    Start at low volume — brown noise energy is concentrated in powerful bass frequencies
  • 3
    Use with speakers that can reproduce low frequencies for the full effect
  • 4
    Earbuds may not reproduce the deepest bass tones effectively

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Frequently Asked Questions

Q What is brown noise?
Brown noise is a type of noise with stronger low-frequency content, producing a deep rumbling sound. It follows a random walk pattern (Brownian motion).
Q Why is it called brown noise?
It's named after Robert Brown, who described Brownian motion (random particle movement), not after the color brown.
Q How is it different from white noise?
White noise has equal energy at all frequencies. Brown noise has much more bass energy, dropping off at -6 dB per octave. It sounds deeper and softer.
Q Is brown noise better for sleep?
Many people prefer brown noise for sleep because it sounds deeper and less harsh than white noise. Personal preference varies.
Q Does it need internet to work?
No. The noise is generated in your browser. Once loaded, it works offline.

About This Tool

Brown Noise Generator 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.