Brown noise (also called Brownian noise or red noise) is produced by integrating white noise, giving it a power spectral density that falls off at 6 dB per octave. It sounds like a deep, rumbling waterfall or strong wind — warmer and lower-pitched than pink or white noise.

Why is it called "brown" noise?

The name comes from Brownian motion (named after botanist Robert Brown), not the color. The mathematical process that generates the signal is the same as a random walk, which models Brownian particle movement. It is also sometimes called red noise.

How is brown noise different from white and pink noise?

White noise has equal energy at every frequency; pink noise (1/f) has equal energy per octave; brown noise (1/f²) has even more energy concentrated in the low frequencies. Brown noise is the warmest and deepest of the three.

Does the audio leave my device?

No. The Web Audio API generates all sound samples locally inside your browser. No audio data is transmitted to any server at any time.

Will it work on my phone?

Yes. The Web Audio API is supported in all modern mobile browsers. On iOS you may need to tap the Play button directly due to browser autoplay restrictions.

Can I use this while working in another tab?

Yes. Once playback starts the audio context continues running in the background as long as the tab remains open.

What does the auto-stop timer do?

When you select a timer (5, 15, 30, or 60 minutes) a countdown begins. When it reaches zero the audio stops automatically so you do not need to remember to turn it off — useful for falling asleep.

Brown Noise Generator

Name: Brown Noise Generator
Availability: InStock
Author: Nham Vu

Generate continuous brown (Brownian/red) noise in your browser for focus, sleep, and sound masking — no download required.

Brown Noise

Volume 70%

Auto-Stop Timer

Stopped

Live Waveform

Brown Noise

Press Play to see the waveform

What is brown noise?

Brown (Brownian / red) noise has a power spectral density that decreases at 6 dB per octave — most of its energy sits in the deep bass. It sounds like a steady waterfall or strong wind, and many people find it easier to focus or sleep with than white or pink noise.

White

Equal at all frequencies. Bright hiss.

Pink

Equal per octave. Gentle rainfall.

Brown

Heavy bass. Deep rumble.

Summary

Generate continuous brown (Brownian/red) noise in your browser for focus, sleep, and sound masking — no download required.

How it works

Click the Play button to start brown noise playback instantly.
Use the Volume slider to adjust loudness from 0% to 100%.
Optionally set an auto-stop timer (5, 15, 30, or 60 minutes) so playback stops automatically.
The live waveform display shows the audio signal in real time.
Click Stop (or the same button) at any time to silence the audio.
All audio is generated client-side using the Web Audio API — nothing is sent to a server.

Use cases

Mask office or household background noise for deeper focus.
Use as a sleep aid — the deep rumble blocks disruptive sounds.
Soothe tinnitus by providing a constant low-frequency backdrop.
Help babies fall asleep with continuous ambient sound.
Create a relaxing atmosphere for meditation or yoga.
Test subwoofer and bass response in audio equipment.
Reduce study distractions in shared or noisy spaces.
Support ADHD focus routines with non-distracting background noise.

Frequently Asked Questions

Last updated: 2026-07-01 · Reviewed by Nham Vu