White Noise Generator
White noise has equal energy at every frequency, pink noise has less treble and sounds softer, and brown noise is deeper still, like a low rumble. This tool plays all three and can switch itself off with a timer.
How to use
- Press Play noise. Browsers only allow sound after a click, so nothing plays until you press the button.
- Choose White, Pink or Brown. You can change it while playing and the sound crossfades.
- Set the volume with the slider. Start low, because noise sounds louder after a few minutes.
- Pick a timer if you want it to stop by itself. The sound fades out over the last 5 seconds and then stops. Press Stop at any time.
How it works
Noise is generated in your browser by a short program, not played from a recording. White noise uses a random number for every sample, so all frequencies carry the same power. Pink noise filters that signal so that power falls by half for every doubling of frequency, which is why it sounds like steady rain or wind. Brown noise falls faster still, by a factor of four per doubling, and sounds like a low, steady rumble.
A 12 second buffer of the chosen noise is generated and played in a loop. The end of the buffer is blended into the start with a short crossfade, so the repeat is not audible as a click.
All three types are scaled to the same average loudness, so switching between them does not change the volume much. The slider uses a squared curve, so the lower half gives finer control over quiet levels.
The timer counts down from the moment you press Play or change the timer. In the last 5 seconds the volume ramps down to zero before the sound stops.
Which noise to pick
| Type | Sound | Often used for |
|---|---|---|
| White | Bright, like static or a fan | Masking office chatter and traffic |
| Pink | Balanced, like steady rain | Sleep and relaxation |
| Brown | Deep, like a distant rumble | Focus and drowning out low sounds |
FAQ
What is the difference between white, pink and brown noise?
White noise is bright and hissy, like static. Pink noise is softer, like steady rain or wind. Brown noise is the deepest, like a distant waterfall or a low engine hum. Many people find pink or brown easier on the ears for long listening.
Does it keep playing in the background?
Usually yes while the tab stays open, though some phones pause web audio when the screen locks or the browser is closed. Keep the tab open and test it once before relying on it overnight.
Is it safe to play all night?
Keep the volume low and the speaker at a distance, especially near babies and young children. Use the timer if you do not need the sound all night.
Why does nothing play?
Check that the device is not muted and the volume slider is above zero. Browsers block sound until you press a button, so press Play noise. If a Bluetooth speaker is connected, sound goes there.
Does it use data or download a file?
No. The noise is created locally and nothing is downloaded or uploaded while it plays.