Noise Generator — White, Brown & Pink Noise
Mix 7 ambient sounds with independent volume controls. Build a personal background mix and set an optional timer. Runs in your browser.
Quick Presets
Sleep Timer
Shortcuts: Space Play/Stop · 1-7 Toggle channels
How to use the noise generator
Three simple steps — build a background mix you like.
Pick your sounds
Toggle on white, brown, or pink noise, or add natural sounds like rain, ocean waves, and wind. Each sound has its own volume slider.
Mix & adjust
Layer multiple sounds and fine-tune each channel. Start with one of five presets, then adjust the mix and master volume.
Set an optional timer
Hit Play and optionally set a timer. The sound fades out automatically when it ends. Background playback can vary by browser and device.
Why use this noise generator?
7-Channel Mixer
Play all seven sounds at once and adjust each one independently. Build a personal background mix for reading, work, or quiet time.
Timer with Fade-Out
Set a 15, 30, 60, or 90 minute timer, or enter a custom duration from 1 to 480 minutes. The sound fades out over the last 10 seconds when the timer ends.
One-Click Presets
Five built-in presets — Deep Focus, Sleep Aid, Calm, Reading, and Storm — provide starting mixes you can adjust at any time.
Browser-Based Mixing
White, brown, and pink noise are generated in your browser. Rain, ocean, wind, and thunder use short audio loops loaded from ToolKnit. The tool does not upload audio from your device. Offline availability depends on browser cache and storage settings.
Pro Tips
- ● Try white, brown, and pink noise, then choose the sound you prefer.
- ● Small changes to volume and mix can create very different background textures.
- ● Start at a comfortable low volume and adjust for your environment.
- ● Layer two or three channels to build a personal background mix.
- ● Press Space to toggle play/pause hands-free while working.
Compare the Sound Options
Each sound has a different texture. Try a few combinations and keep the mix you enjoy.
A bright, even hiss that can be a useful starting point for a steady background mix while reading, working, or studying.
A deeper, lower-frequency rumble. Try it if you prefer a waterfall- or distant-surf-like texture over a brighter hiss.
A balanced texture with equal energy per octave. It often sounds closer to steady rainfall than white noise does.
A steady rainfall loop that works on its own or as a layer under one of the generated noise channels.
A repeating wave pattern that pairs naturally with pink noise when you want a beach-like background texture.
An airy layer with gentle gusts. Add it at a lower level to give a mix more movement and space.
A distant rolling layer that adds dramatic low-end texture. Pair it with rain and wind for a fuller storm mix.
The Noise Color Spectrum Explained
Noise “colors” are named by analogy with light — just as white light contains all visible wavelengths, white noise contains all audible frequencies.
Like white light, white noise has equal energy at every frequency — from 20 Hz to 20,000 Hz. It sounds like an untuned TV or radio static. Because every frequency is equally loud, it masks a wide range of sounds effectively. Names in signal processing: additive white Gaussian noise (AWGN).
Pink noise has equal energy per octave — meaning each octave carries the same power. Since lower octaves span fewer Hertz, lower frequencies are louder. It sounds deeper than white noise, like steady rain or a waterfall heard from a distance. The name comes from pink light (which has more low-frequency red). Pink noise is found throughout nature: heartbeats, ocean waves, cosmic radiation, and even DNA sequences show 1/f (pink) patterns.
Brown noise (Brownian noise) has even more low-frequency energy than pink noise — its power drops 6 dB per octave. It sounds like a deep, rich rumble: a massive waterfall, a jet engine from miles away, or ocean surf during a storm. Named after Brownian motion (not the color brown), it is mathematically the integral of white noise. That is why it has such a smooth, deep character.
Ways to Build a Background Mix
Start with a preset or combine channels to create a soundscape that suits the moment.
Remote Workers & Programmers
Try the Deep Focus preset as a starting point, then raise or lower white noise and wind until the background texture suits your workspace.
Evening Routines
Use the Sleep Aid preset as a starting mix of brown noise, rain, and thunder. Choose a timer length, then adjust each channel and the master volume to your preference.
Custom Soundscapes
Every channel has its own slider. Once you find a combination you like, save it as a custom preset in this browser for quick reuse.
Background Sound Fans
Compare the brighter white noise, deeper brown noise, and more balanced pink noise, then layer in rain, ocean, wind, or thunder for a different texture.
Meditation & Yoga Practitioners
Ocean waves plus pink noise creates a beach-like background texture. Use the Calm preset as a starting point, then save your preferred mix for quick access.
Frequently Asked Questions
Everything you need to know about the noise generator.
Yes. The ToolKnit noise generator is currently free to use with no account or installation required. It mixes audio in your browser. Offline availability depends on which assets the browser keeps cached.
White noise has equal energy across frequencies and sounds like TV static. Pink noise has equal energy per octave and often sounds more balanced. Brown noise emphasizes lower frequencies and sounds deeper. They are different sound textures, so the best choice is personal preference.
Yes. You can play all seven sounds at the same time and adjust each one's volume independently. For example, layer brown noise with rain or white noise with wind, then adjust each level to taste.
Choose 15, 30, 60, or 90 minutes, or enter a custom duration from 1 to 480 minutes. When the timer ends, the sound fades out over 10 seconds and stops automatically.
Yes, the noise generator is responsive on iPhone, Android, and tablets. Tap Play to enable audio because mobile browsers require a user interaction. Background playback behavior varies by browser and device.
Yes. Adjust the channels, then use Save Preset to store the current mix in this browser. You can load it again or remove it later from the custom preset list.
There is no universal best choice. Try white noise for a brighter hiss, brown noise for a deeper rumble, or pink noise for a more balanced texture, then adjust the channels to your preference.
Yes. Lower the master volume or reduce individual channel sliders. Start at a comfortable level and adjust the balance until the mix feels right for your environment.
Yes, if ambient audio fits your practice. The Calm preset is a starting mix of pink noise and ocean waves, and you can adjust any channel. The Space bar toggles playback.
Battery use varies by device, browser, selected sounds, and volume. White, brown, and pink noise are generated with Web Audio; rain, ocean, wind, and thunder use short looping audio files. The tool does not set a fixed battery-use percentage.
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