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§ · free tool

White noise & ambience. Synthesized, not streamed.

Mix white, pink and brown noise with rain, fan and ocean ambience for focus or sleep. Every sound is generated live on your device, no audio files, no streaming, nothing uploaded.

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A free online tool by Digital Heroes

Nothing plays until you click a sound (browsers require a tap to start audio). Everything is generated locally, it even works offline.

0 sounds playing

Sleep timer

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The mix fades out gently over the last 15 seconds, then stops. Keep this tab open while playing, some phones pause audio in background tabs or when the screen locks.

Export your mix as WAV

Renders the sounds that are currently playing, at their current volumes, into a downloadable 16-bit stereo WAV (~10 MB per minute). Loop it in any player.

No samples, no streaming, pure synthesis

Ambience sites usually stream big audio loops from a server. Here, white noise is a buffer of cryptographically random samples; pink and brown run that randomness through filtering integrators so the energy shifts toward lower frequencies; rain is band-passed noise sprinkled with randomized droplet blips; the fan is a low hum plus band-passed noise with a blade-rate wobble; and the ocean swells with slow LFOs on gain and filter. It all runs through the Web Audio API on your device, private, offline-capable, and free.

§ 02 · what you can do

Everything an ambience mixer should do.

  • Play white, pink or brown noise to mask distractions and settle into focus or sleep.
  • Layer rain, fan and ocean sounds together in any combination, each with its own volume slider.
  • Balance the mix with a master volume plus per-sound levels, every change is smooth, no clicks.
  • Set a sleep timer for 15, 30, 60 or 90 minutes (or a custom duration up to 720), with an automatic 15-second fade-out.
  • Export your mix as a WAV, 30 seconds, 1 minute or 3 minutes of loopable 16-bit stereo audio.
  • Stay private and offline: everything is synthesized locally with the Web Audio API, nothing is uploaded, no account needed.
§ 03 · how to use it

Five steps, no manual.

  1. Click Play on any sound card to start it, you can run several at once.
  2. Drag each card’s volume slider to balance the mix, and use Master volume for the overall level.
  3. Optionally set a sleep timer from a preset or a custom number of minutes so the mix fades out when you drift off.
  4. Click ⤓ Download WAV to render the currently-playing mix into a loopable audio file.
  5. Press ■ Stop all (or each card’s Stop) whenever you’re done, no cleanup needed.
§ 04 · faq

Frequently asked questions.

Is White Noise & Ambience free?
Yes, completely free for everyone. No sign-up, no account and no usage limits.
Is it private? Is any audio uploaded?
No audio leaves your device. Every sound is synthesized locally in your browser with the Web Audio API, nothing is uploaded to a server, and no account is required.
Does it work offline?
Yes, once the page has loaded, the tool keeps working without an internet connection, because all sound generation runs on your device.
What sounds are included?
Six sounds: white noise, pink noise, brown noise, rain, fan and ocean. You can play and layer any combination, with an individual volume control for each.
How does the sleep timer work?
Pick a preset (15, 30, 60 or 90 minutes) or type a custom duration up to 720 minutes. The mix fades out smoothly over the last 15 seconds, then stops automatically.
Can I download my mix?
Yes. Start the sounds you want, set their levels, then choose a length (30 seconds, 1 minute or 3 minutes) and click Download WAV. It renders exactly what’s playing into a loopable 16-bit stereo WAV file.

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