How to use
- Choose white, pink or brown noise and click Play.
- Turn the volume up just enough to cover the background noise.
- Optionally pick a time under Stop after; the sound fades out over the last minute.
Options explained
- White noise
- Equal energy at all frequencies. It sounds bright and masks voices and keyboard clatter well.
- Pink noise
- Energy halves (−3 dB) with each octave, so it is softer than white noise, like steady rain.
- Brown noise
- Falls 6 dB per octave. Deep, like a waterfall or an aircraft cabin; many people find it the most relaxing.
How the sound is made, and what the volume slider does
White noise is random samples. Pink noise passes the same random samples through a filter that lowers the highs by 3 dB per octave. Brown noise adds up the random samples so that low frequencies dominate, falling 6 dB per octave. Left and right channels get separate noise, and a loop of about 20 seconds repeats with a half-second crossfade at the join.
The Volume slider is not linear: the playback gain is the slider value squared, so each step at the low end is gentler.
| Volume | Gain | Level |
|---|---|---|
| 100% | 1.00 | 0 dB |
| 75% | 0.56 | −5 dB |
| 50% | 0.25 | −12 dB |
| 40% (default) | 0.16 | −16 dB |
| 25% | 0.06 | −24 dB |
| 10% | 0.01 | −40 dB |
Stop after offers 15, 30, 45, 60, 90 and 120 minutes. The page opens with pink noise and a 30-minute timer, so choose No timer if you want it to keep playing.
Frequently asked questions
Does white noise help you sleep?
It helps some people, mainly by covering sudden sounds and making the background steadier. Keep it moderate — around 50 dB — rather than loud all night.
What about babies?
Keep the volume low and the device at least 2 m from the cot, and use the timer to switch it off once the baby is asleep.
Does it keep playing when my screen locks?
On a computer it keeps playing in a background tab. On phones the browser may be paused when the screen locks, depending on the system and browser.
Privacy
This tool runs entirely in your browser. Your files and text are processed on your device and are never uploaded to our servers.