Generate white, pink, brown, blue, violet and grey noise in your browser, mix rain, wind and ocean waves, use the timer and download WAV.
Noise is a random signal. What sorts it into "colors" is its power spectral density, meaning how much energy it has in each frequency range. In white noise it is flat: every hertz carries the same power. Because each octave is twice as wide as the one below, white noise sounds hissy and bright. Pink noise falls 3.01 dB per octave (density proportional to 1/f), so every octave carries the same energy, and it sounds more balanced. Brown noise falls 6.02 dB per octave (1/f squared) and sounds deep and full; the name comes from Brownian motion, not from the color brown. Here the noise is computed in your browser, sample by sample, from pseudorandom numbers that go through filters: pink uses Paul Kellet's filter (accurate to within ±0.05 dB above 9.2 Hz at 44.1 kHz, according to its author), brown is a leaky integration of white (12 Hz corner), blue is the difference of pink and violet is the difference of white. The chart compares the theoretical line with the measured spectrum of what you are hearing, and the tool computes the slope live.
The slope is measured on density per hertz, on a logarithmic frequency scale. That is why white shows as a horizontal line, pink as a line falling 3 dB every time the frequency doubles, and brown falling 6 dB. Blue and violet are the mirror image: they rise 3 and 6 dB per octave. Grey has no single slope: it is white noise weighted by an equal-loudness curve, which compensates for the ear being less sensitive to very low and very high frequencies.
No sound comes from audio files. To play, the generator computes a stretch of noise (12 seconds for the colors, 10 to 28 seconds for the layers) and loops it. The end of the stretch is blended into its start with constant-power gains, so the loop point makes no click and no dip in level. The right channel starts at a different point of the same stretch, which makes the two sides uncorrelated, and the stereo width control mixes the channels from zero (mono) to one hundred percent (wide).
The layers are filtered noise with slow envelopes, not recordings: rain is a hiss of mids and highs with random drops, wind is a band of lows and mids whose frequency and intensity drift slowly, ocean waves are low noise in cycles of about 7 to 13 seconds, and the fan is noise with a faint hum near 118 Hz. They are sounds inspired by natural ones. In the WAV download the audio is generated continuously, without repeating any stretch, in blocks of 10 seconds.
Many people use steady noise to mask sounds or to concentrate, but the scientific evidence is weak. A systematic review published in 2021 in Sleep Medicine Reviews (Riedy and colleagues) assessed studies of continuous noise as a sleep aid, rated the quality of the evidence as very low under the GRADE criteria, and noted that noise may also harm sleep and hearing. The studies varied widely in noise type, loudness and method. This tool is not a treatment or a medical device and makes no promises about sleep or attention. If you have persistent insomnia or a health condition, talk to a professional.
The WHO-ITU standard for personal audio devices uses 80 dB for 40 hours per week as the adult reference (75 dB for children). Every 3 dB increase halves the safe time. This site cannot measure the real sound level, because it depends on your device, headphones and system volume. Keep the volume low enough to hold a normal conversation, avoid loud headphones for many hours, and prefer a speaker at some distance during sleep. The site's decibel meter can help check the room.
Paste the code into your HTML and the tool shows up on your page, without J-Kit's navigation and ads. It still runs in the browser of whoever visits your site.
<iframe
src="https://jkit.tools/embed/en-US/white-noise-generator"
width="100%"
height="600"
style="border:0"
loading="lazy"
title="White, Pink and Brown Noise Generator"
></iframe>These references help contextualize formulas, standards, APIs and limitations used on this page. They do not replace professional validation when a result has legal, financial, medical or operational impact.
It is how energy is distributed across frequencies. White has equal power in every hertz and sounds hissy and bright. Pink falls 3.01 dB per octave and has equal energy in every octave, sounding more balanced, like steady heavy rain. Brown falls 6.02 dB per octave and sounds deep and muffled, like a distant waterfall. The chart in the tool shows these lines live.
Start low and raise it slowly. Loud volume for many hours, especially on headphones, can damage your hearing.
Save the current mix to reuse it later. Presets stay in this browser only.
WAV file of about 106 MB (16-bit PCM, 44.1 kHz). Maximum in this mode: 18 minutes. The file is built in browser memory, so the limit is lower.
The sound is generated in your browser, with no audio files and no data sent anywhere. Presets and settings are saved only on this device.