// generate · tool 25
White Noise Generator
White, pink and brown noise synthesized on your device — with a sleep timer and downloadable seamless loops for offline listening.
Three colors of noise, synthesized correctly
Most "noise generator" sites loop a compressed audio file. This page synthesizes noise mathematically on your device: white noise from a uniform random generator, pink noise through the Paul Kellet filter network (−3 dB/octave, the studio standard for speaker calibration), and brown noise by leaky integration (−6 dB/octave). No streaming, no loop seams, no compression artifacts hissing on top of your noise.
Which color does what
- White — equal energy per hertz. Bright, like static. Best for masking high-pitched sounds and for testing equipment.
- Pink — equal energy per octave, matching human hearing. Sounds like steady rain. The standard for room and speaker measurement, and a gentle sleep/focus backdrop.
- Brown — deep rumble, like a waterfall or a long-haul cabin. The internet's favorite for drowning out traffic, snoring and voices.
Sleep timer & offline loops
Set the timer to 15, 30 or 60 minutes and the noise fades out by itself. For phones and offline use, download a 1–10 minute WAV or MP3 — the loop point is crossfaded so repeat playback is genuinely seamless. Put it on repeat in any player and it's indistinguishable from this page running live.
FAQ
What's the difference between white, pink and brown noise?
White: equal energy at every frequency, bright like static. Pink: −3 dB/octave, balanced like rain. Brown: −6 dB/octave, deep like a waterfall.
Which noise color is best for sleep?
Personal preference — but most people find pink or brown more pleasant than white, whose top end can fatigue. Brown is the favorite for masking traffic and voices.
Do the downloaded loops repeat seamlessly?
Yes — a short crossfade is engineered at the loop point, so repeat playback has no click or gap.
Does this need internet while playing?
No — the noise is synthesized locally and never streams. Downloaded loops work offline anywhere.