Brown Noise - Free Online | FunToolX
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Brown Noise
Deep low frequency, sleep aid
⚡ Web Audio API real-time synthesis, zero files
About this tool
Brown Noise is a free online ambient sound player. Deep low frequency brown noise, powerful sleep aid, blocks environmental noise. Perfect for focusing, sleeping, or relaxing. It runs entirely in your browser — no download or sign-up needed.
The energy of brown noise decays rapidly as the frequency increases, and low-frequency components dominate. It sounds like distant thunder, loud wind, or heavy waterfalls, deeper than pink noise. You can adjust the volume and playback duration.
The generation algorithm is realized by integrating (accumulating) the white noise, and the amount of change at each step is random. This random walk process produces a spectral characteristic of 1/f². The browser side generates it in real time through the Web Audio API.
Suitable for sleeping, relaxing, and shielding low-frequency environmental noise. Some people find brown noise more comfortable than white noise, especially for sensitive people. Can be mixed with other environmental sounds.
Brown noise (red noise) generator generates a random signal with frequency energy inversely proportional to the square of the frequency. The sound is deep and deep, similar to thunder or a waterfall.