White Noise Generator
Generate white noise as MP3 or WAV: up to 60 minutes, stereo, an exact level in dBFS, fades or a seamless loop, plus blue and violet noise.
White noise is a steady hiss with the same energy at every frequency, like an untuned radio or a fan on high. People use it to mask distracting sounds while sleeping or working, to calm babies, and to test speakers, headphones and rooms. This generator makes a fresh file of up to an hour at an exact level, in stereo with a different noise in each ear, with fades or as a seamless loop. Brighter blue and violet noise are included too.
How to use this tool
- Choose the length and the format: MP3 for long files, WAV for exact samples and perfect loops.
- Pick the colour (white for a neutral hiss) and the level; −20 dBFS RMS is a safe start.
- Choose stereo, fades or a seamless loop, and press Calculate; an hour of MP3 can take a few minutes to make.
- Play it here or download it, and turn on loop in your player for endless noise.
Formula
Level (dBFS RMS) = 20 × log10(RMS) · gain = 10^(level ÷ 20) ÷ √(σ² × Σh²)
σ² is the variance of the random samples (1/3 for uniform values between −1 and +1, 1 for Gaussian ones) and Σh² is the power gain of the colour filter: 1 for white, 2 for violet (the difference of neighbouring samples, +6 dB per octave) and about 538 for blue (the inverse of Robert Bristow-Johnson's pinking filter, +3 dB per octave). WAV files are generated in your browser. MP3 files are made by the ffmpeg engine (about 30 MB, downloaded once) from its own white noise source with the same filters; MP3 keeps frequencies only up to about 18.5 kHz, so a short test encode is measured first and the level is corrected for what the encoder removes.
Example
At −20 dBFS RMS the noise's average amplitude is 10^(−20 ÷ 20) = 0.1 of full scale. Uniform white noise peaks at √3 times its RMS, so its highest samples reach about 0.173, or −15.2 dBFS. A 30-minute stereo MP3 at 192 kbps is 192,000 ÷ 8 × 1,800 = 43.2 MB.
Frequently asked questions
Is white noise good for sleep?
Many people find a steady sound helps them ignore traffic, snoring or voices, but research results are mixed and it is not a treatment. Keep it quiet: well below normal conversation, especially with headphones or for a baby, and place speakers away from the bed.
What is the difference between white, pink and brown noise?
White noise has equal energy at every frequency, which our ears hear as bright hiss. Pink noise falls by 3 dB per octave and sounds like steady rain; brown noise falls by 6 dB per octave and sounds like a deep rumble. Blue and violet noise rise instead and sound even sharper than white.
Can I use it to test speakers or measure a room?
Yes. Choose WAV for exact samples: the level is set as an average (RMS) and the result reports the measured RMS and peak. For frequency-response checks most people prefer pink noise, which has equal energy per octave.
Why can the level not go higher?
Noise has peaks well above its average. Above about −16 dBFS RMS some peaks would reach full scale and distort, especially after MP3 encoding. Raise your device volume instead.
Last updated:
Page address with these inputs: https://kakao.mobile/tools/white-noise-generator/
Cite or embed this tool
kakaoCalc. (2026, November 8). White Noise Generator. https://kakao.mobile/tools/white-noise-generator/
“White Noise Generator.” kakaoCalc, 8 Nov. 2026, kakao.mobile/tools/white-noise-generator/.