White, Pink and Brown Noise Generator with Timer

How to use it

Choose the Kind of noise you want.
Set the Volume, and the Stop after timer if you want the noise to end by itself.
Set Fade in and Fade out in seconds, then press Play.
Press Stop to fade the noise out, or let the timer end it.

The three kinds of noise

White noise has the same power at every frequency, so it sounds like a bright hiss. Pink noise has the same power in every octave, so it sounds softer and more even; Paul Kellet's refined filter, which the page uses, turns white noise into pink. Brown noise, also called red noise, has most of its power at low frequencies, so it sounds like a rumble; the page makes it by adding up small random steps with a slight leak, so the level stays bounded. This page is not medical advice: it does not diagnose or treat tinnitus, hearing loss or sleep problems.

Volume, fades and the timer

The volume is capped at half of full scale, about -6 dBFS. The fade in and fade out are straight-line changes of level. With a timer, the fade out starts one fade-out length before the time you set, so the sound is silent when that time has passed. The noise is an eight-second loop with a short crossfade at its seam, which hides the point where the loop starts again.

Keep the volume safe

The NIDCD notes that sounds at or above 85 dBA can cause hearing loss with long exposure. Keep the noise at a level where you can talk over it comfortably, and never play it at a volume that hurts.

Example: the fade at the end of a timer

With a 60-minute timer and a 5-second fade out, the fade starts at 59 minutes 55 seconds and the noise is silent at 60 minutes. Halfway through the fade, at 59 minutes 57.5 seconds, the level is half the volume you set.

Frequently asked questions

Does this noise help sleep or tinnitus?

This page does not treat or diagnose any condition, and it is not medical advice. Some people find steady background sound helpful. If you have tinnitus, hearing loss or sleep problems, ask a doctor or an audiologist.

What is the difference between white and pink noise?

White noise has equal power at every frequency, so the high frequencies dominate and it sounds like a hiss. Pink noise has equal power in each octave, so it sounds more even and softer to most listeners.

Why does the sound fade in when I press Play?

A fade in avoids a sudden click and a startling loud start. Set the fade in to 0 seconds if you want the noise at full level at once.

Does the noise stop when I leave the page?

Yes. Leaving the page stops the sound at once and nothing is kept. The timer runs only while the page is open.

Why does brown noise sound so deep?

Brown noise has most of its power at low frequencies, and the power falls as the frequency rises. Small speakers cannot reproduce the lowest parts, so headphones or a larger speaker sound fuller.

Sources

Figures and text last checked on Tuesday, November 10, 2026.