White Noise Generator: Free Sleep & Focus Sounds, No Loops

About the White Noise Generator

Steady, featureless sound masks the unsteady kind — the neighbor's TV, the hallway conversation, the 3 a.m. car door — which is why noise helps so many people sleep and focus. This generator synthesizes it live on your device with the Web Audio API: no audio files, no loops, no buffering, and because the sound is mathematically continuous, none of the tell-tale looping seams that recorded tracks have. Once the page loads it works offline, all night, for free.

The colors of noise, plainly

📺 White — equal energy at every frequency: a bright, full hiss like an old TV between channels. The strongest masker of high-pitched sounds.
🌸 Pink — energy falls off gently as pitch rises (1/f), which matches how our ears perceive loudness. Softer and more natural than white; the most popular for focus.
🌊 Brown — energy concentrated in the lows (1/f²): a deep rumble like a waterfall or an airliner cabin. The internet's favorite for sleep, and famously popular with ADHD communities.
🌀 Fan — white noise shaped to mimic the muffled hum of a box fan, for people who sleep with a fan on and want it without the electricity bill.
🏖️ Ocean — brown noise with slow, breathing swells, like waves on a shore.

Built for the nightstand

Sleep timer — 15, 30, 60, or 90 minutes, ending with a gentle 10-second fade instead of an abrupt cut. (90 minutes ≈ one full sleep cycle.)
Tone control — pull it left to darken any noise color when the hiss feels too sharp; the fan and ocean respond too.
Keeps playing in background tabs — switch to your work and the sound continues. Your volume, tone, and chosen noise are remembered for next time.
No ads, no interruptions — nothing worse than an ad break in your sleep sounds at 2 a.m. There are none here, ever.

Honest notes

The evidence on noise and sleep is mixed at the population level — but if it works for you, that's the only trial that matters. Keep the volume moderate; masking works at surprisingly low levels, and all-night loud audio isn't kind to ears.
On phones, the screen must stay unlocked in the browser for audio to continue on some devices — or add the page to your home screen for better behavior.
The ocean and fan sounds are honest synthesis, not recordings — they're evocative rather than photorealistic, and they never loop.

Common questions

What is the difference between white, pink, and brown noise?

White noise spreads energy evenly across frequencies (bright, hissy), pink tilts toward lows (balanced, rain-like), and brown tilts further (deep, rumbly). Most sleepers land on pink or brown; switching takes one tap to compare.

Does white noise help you sleep?

It masks the unpredictable sounds (doors, traffic, pipes) that wake you, smoothing the acoustic environment. Many people sleep measurably better with it, especially in loud homes; brown noise at low volume is the classic recipe.

Why does this sound better than white noise loops?

Because there is no loop: the sound is synthesized live by your browser's audio engine, so there is no seam to catch your ear at 2am and no repetition to learn.

Does it stream or use data all night?

No, once loaded it generates sound locally with zero streaming, which makes it kind to data plans and reliable on flaky connections.

Is there a sleep timer?

Yes, set it and the sound fades out gently at the end instead of stopping cold, which is the difference between drifting off and being startled awake.