How to use the green noise generator
- Turn your device volume down, then press Play. The noise fades in at 25% volume.
- Try the presets. Classic is centered at 500 Hz, Low at 300 Hz with a broad boost, Bright at 800 Hz with a narrow one.
- Move Center to the left for a fuller sound or to the right for a brighter one.
- Change Width for a focused band (Narrow) or a broad one (Wide).
- Set the sleep timer and fade-out if you want it to stop by itself.
- Lock your phone or press ◐ Dim screen. The sound keeps playing.
With the tool focused, Space or K plays and pauses, ↑ and ↓ change the volume, [ and ] move Center in small steps, 1, 2 and 3 pick the width, and D dims the screen.
What is green noise?
Green noise is steady noise with its energy focused in the middle of the audible range, usually described as centered near 500 Hz. It sounds fuller than white or pink noise and less deep than brown noise.
Here’s the honest part: unlike white, pink and brown noise, green noise has no single technical definition. Sleep-sound makers use the name loosely, so two “green noise” videos can sound quite different. In image processing, “green noise” means something else entirely: a halftone dot pattern with mostly mid-frequency structure.
People often compare our Classic setting to a steady waterfall or wind moving through trees. Because “green” is a loose label, this page lets you tune the center and width and shows the exact shape you’re hearing.
How we make green noise
We start from pink noise, which already sounds balanced, and shape it in three steps. A gentle filter trims the far lows below a fifth of the Center, and another trims the far highs above ten times the Center. Then a broad boost of 12 dB lifts the band around the Center. Finally, the overall level is lowered so the sound stays as loud as before when you change the settings.
The small graph under the controls shows that shape from 20 Hz to 20 kHz. It updates as you move Center and Width, even before you press Play. Green noise videos are fixed recordings of someone else’s idea of green; here you can see the shape and change it. Everything is generated live in your browser, so it never loops or ends. Read more about the starting sound on the pink noise page.
What does each color noise do?
| Color | Shape | Often compared to | What many people use it for |
|---|---|---|---|
| White | Equal energy per hertz, bright | A hiss, a detuned radio | Masking speech and sudden sounds |
| Pink | Falls 3 dB per octave | Steady rain | A softer background for sleep or focus |
| Brown | Falls 6 dB per octave | A distant rumble, surf | A deep, low background |
| Green | A bump in the middle | A waterfall, wind in trees | A full sound without hiss or rumble |
All four are steady sounds, and that’s their whole job: they make changing noises, like traffic, a neighbor’s TV or a snoring partner, less noticeable. Many people try several colors before settling on one. Compare the white noise and brown noise generators with this one at the same low volume.
Is green noise safe to listen to?
Green noise is ordinary sound, so the thing to watch is volume. Keep it at a level you could talk over without raising your voice, and put a speaker across the room rather than next to your head. With headphones or earbuds, stay at a low volume, especially for a whole night.
If you only need it to fall asleep, the sleep timer with a fade-out lets it stop on its own. This page doesn’t promise any health effect: it gives you a steady, adjustable sound and leaves the choice to you.