White Noise is a free online tool that mixes ambient sounds for focus and sleep — white, pink and brown noise, rain and ocean — generated live in your browser, with per-sound volumes and a sleep timer. No audio files, no account, nothing leaves the page.
Master control
Sleep timer:
Pick a sound below, then press Play. Press Space to pause or resume.
Level meter
Presets
How it works
White noise — equal energy at every frequency; bright and hissy, the best masker for sharp sounds like voices and keyboards.
Pink noise — softer than white: energy falls as frequency rises, so it sounds like steady rainfall and feels less harsh over long sessions.
Brown noise — deeper still, most energy in the bass; the rumble people reach for to sleep or to drown out low traffic hum.
Rain & ocean — filtered noise shaped to patter and swell. Every sound here is synthesised live with the Web Audio API; nothing is streamed or downloaded.
Note: browsers may pause audio when this tab is backgrounded on mobile. Keep the tab in the foreground for uninterrupted playback.