White Noise Generator

Generate white, pink and brown noise for focus or sleep.

Everything runs in your browser. No audio is ever uploaded.

Noise color

Equal energy at every frequency. Bright and hissy, like static or rushing air.

Settings

Volume-12 dB

Sleep timer

The last 30 seconds fade out before playback stops.

Audio starts on your first tap on Play, as required by your browser. Press Space to start or stop.

A white noise generator plays a steady wash of sound that covers every frequency at once. This sound masking tool also gives you pink noise and brown noise, the softer, lower colors most people reach for at night, with a sleep timer that fades out instead of cutting off.

This generator keeps the three classic colors: white, pink and brown. For blue, violet and gray as well, open the full palette: Colored Noise Generator

Popular presets

Brown Noise Generator: the deepest of the three noise colors, ready to play

How to use it

Pick a color. White is the brightest, pink sits in the middle, brown is the deepest. The line under the buttons describes the one you have selected.
Set the level in decibels. Noise fades in when you start rather than snapping on, so you can leave the slider low and raise it while it runs.
Choose a sleep timer: off, 15, 30 or 60 minutes. The remaining time is shown while it counts down, and the last half minute fades to silence before it stops.
Press Play, or hit the space bar. The waveform above shows the signal that is going out, which is a quick way to confirm that something really is playing.
Use Copy link to save or share the exact color and level you settled on, and Reset to go back to the defaults.

What you can use it for

Sleeping through a noisy street. Constant noise does not remove other sounds, it raises the floor they have to stand out from, so a passing car or a snoring partner stops jerking you awake.

Concentrating in an open office. Speech is the hardest sound to ignore because you keep decoding it. A steady wash makes the words unintelligible, which is what actually frees your attention.

Masking tinnitus. Many people find a quiet background easier than silence, because a ringing tone stands out less against noise. Match the color to your own tone: brown for a low hum, white for a high hiss.

Settling a baby or a nervous dog. Pink and brown noise are the usual choices because they are soft in the highs. Keep the level low and the speaker well away from the cot or the basket.

Checking a speaker. Pink noise is the classic tool for it: it carries the same energy in every octave, so an even spectrum should sound even, and a hole or a resonance is easier to hear than with music.

The three noise colors

Color	Slope	Sounds like	Typical use
White	flat, equal energy per hertz	A bright hiss, like an untuned radio.	Covering speech, keyboards and other high sounds.
Pink	-3 dB per octave, equal energy per octave	Steady rain, close to how the ear expects sound to balance.	Sleep, focus, and checking speakers and rooms.
Brown	-6 dB per octave	Distant surf or a waterfall, with almost no hiss.	Sleep, and masking traffic rumble through a wall.

Accuracy and limits

Masking is not soundproofing. Noise hides other sounds by sitting above them, which means the total level in the room goes up, not down. Set it just loud enough to blur what you are covering and no louder, especially if it runs all night.

The decibel slider is relative to your own system, not a sound pressure level. This page has no idea how loud the room actually is; the decibel meter can give you a rough figure, with its own calibration caveats.

Playback depends on the browser staying awake. Phones and tablets can suspend audio when the screen locks or the tab moves to the background, and the sleep timer only counts while the page is alive. If the timer matters, keep the tab open and the screen on.

Frequently asked questions

Which noise color is best for sleep?

Most people prefer pink or brown, because both put less energy into the highs and sound softer over hours. There is no single right answer, and the research on noise improving sleep is thin. Try each for a few nights.

Is it safe to play white noise all night?

At a low level it is fine for most adults. The risk is volume rather than duration: quiet enough to talk over is a good rule. For infants keep it quieter still and place the speaker across the room rather than beside the cot.

What is the difference between white, pink and brown noise?

How the energy is spread. White is flat per hertz and sounds bright, pink drops by 3 dB per octave and sounds natural, brown drops by 6 dB per octave and sounds deep. Same randomness, different tilt.

Does the sleep timer fade out?

Yes. The last half minute fades down to silence and then stops, so nothing cuts off abruptly while you are drifting off.

Does it work offline?

Yes. The noise is generated on your device by the Web Audio API, not streamed, so once the page has loaded you can disconnect the network and it keeps running.

Can I download the noise as a file?

Not from this page. The noise is generated live from a ten second stereo buffer, long enough that the loop seam is not audible. If you need a file you can keep, the tone generator and the sweep generator both export WAV.