Noise Generator
Noise Generator is a free online tool that lets you play the different colors of noise directly in your browser, or download them as a WAV file. Choose between white, pink, brown, blue, violet, grey, green and black noise, adjust the volume and the stereo width, and watch the spectrum of each color while it plays.
Noise is often used to help sleeping, studying and concentrating, to mask traffic or office chatter, to soothe a baby, to relieve tinnitus, and to test audio equipment. Different colors suit different purposes: white noise is bright and hissy, pink noise sounds much more natural, and brown noise is a deep rumble that many people find the most relaxing of all.
How to use this online tool?
To play noise directly in your browser, choose one of the noise colors, adjust the volume and the stereo width, and click on the button "Play". You can change the color, the volume and the stereo width at any time. Then, click on "Stop" to stop the audio.
To generate and download a noise audio file (WAV file), choose the noise color, the stereo width and the duration (in seconds), and click on "Download".
Noise color
Pink noise: In pink noise the energy falls by 3 dB per octave, so every octave carries the same amount of power. That matches the way we hear far better than white noise does, which is why pink noise sounds fuller, softer and more natural, close to steady rain or wind in the trees. It is the most popular choice for sleeping, studying and masking background sounds.
Spectrum, from 20 Hz on the left to 20 kHz on the right
Volume (%)
Stereo width
Download
Download the pink noise audio in the wav format.
Duration:
seconds
Up to 300 seconds (5 minutes).
The colors of noise
The color of a noise describes how its energy is spread over the frequencies. The names come from an analogy with light: white light contains every color in equal amounts, so white noise contains every frequency in equal amounts. From there, each color tilts the spectrum in a different direction.
| Color | Spectrum | What it sounds like |
|---|---|---|
| White | 0 dB/octave | Equal energy at every frequency. |
| Pink | -3 dB/octave | The most natural sounding noise. |
| Brown | -6 dB/octave | Deep and warm, like distant surf. |
| Blue | +3 dB/octave | The mirror image of pink noise. |
| Violet | +6 dB/octave | The mirror image of brown noise. |
| Grey | Perceptually flat | Equally loud at every frequency. |
| Green | Mid frequencies | The background noise of nature. |
| Black | Near silence | Silence, with rare and sparse bursts. |
The stereo width control changes how wide the noise feels. The two channels are generated independently, which gives a very open sound on headphones ("normal" and "wide"). Choose "mono" when both channels should be identical, for example when the audio will be played on a single speaker.