Brown, Pink & White Noise Generator

All three are random sound, but they spread their energy differently across pitches. White noise has equal power at every frequency, so it sounds bright and hissy, like a fan or TV static. Pink noise loses about 3 dB of power per octave, which gives every octave the same total energy; to most ears it sounds smoother, like steady rain. Brown noise (named after Brownian motion, not the colour) falls off about 6 dB per octave, so the low rumble dominates, closer to surf or a distant waterfall.

This generator builds the sound mathematically in your browser. White noise is a stream of independent random samples. Pink noise passes that stream through a set of gentle low-pass filters (Paul Kellet's widely used design). Brown noise accumulates the random steps with a slight leak so the signal wanders slowly instead of drifting off. Each is normalized so it never clips, then looped seamlessly.

• Start playback with your device volume low, then raise the on-screen slider slowly.
• Try brown noise if white noise feels harsh; try pink if brown feels muddy.
• For focus, pair noise with a timer such as a 25-minute work block.
• Keep the tab open. Some phones pause web audio when the screen locks; the page tells you this rather than failing silently.
• The sound is generated on your device. No audio files are downloaded and nothing about your use is recorded.