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

They differ in how the energy is spread across pitches. White noise has the same energy at every frequency, so it sounds bright and hissy. Pink noise falls by 3 dB per octave, which sounds softer and more natural. Brown noise falls by 6 dB per octave, so it is deep and rumbling. The page makes them with WebAudio: pink noise is white noise passed through a filter bank, and brown noise through a leaky integrator.

How do I mix sounds and make rain or ocean?

Move the "White noise", "Pink noise", "Brown noise", "Rain" and "Ocean waves" sliders to blend them, or press a quick mix such as "Rain" or "Deep sleep". Rain and ocean are not recordings. Rain is filtered noise with a flickering level, and ocean is brown noise with slow waves that swell and fade.

How does the sleep timer work?

Choose 15, 30, 45, 60, 90 or 120 minutes in "Sleep timer" and press "Play". The sound plays at full level until 30 seconds before the end, fades out smoothly and stops. You can change the timer while it plays. Press "Stop" at any time to end it sooner.

How do I download a long noise file?

Set "File length" from 1 to 60 minutes, press "Make file", then choose WAV or MP3 and press the download button. The page renders one 60 second loopable segment of your mix on your device and repeats it to the length you chose, so the file joins up without a gap. A 60 minute WAV is about 606 MB, so the page warns you at 100 MB and 500 MB. An MP3 of the same length is about 55 MB.

Is it safe to sleep with noise playing?

Keep it at a low volume, because loud sound for hours can tire or damage hearing, especially through headphones. The volume starts at 30 percent and the slider is capped well below full scale. Use the sleep timer so it does not play all night, and check with a doctor if you use noise to cover ringing in your ears.

Yes. Every tool is free to use, with no account and no credit card. The work runs on your device rather than on our servers, which is what keeps it free to run.

Does it work on mobile?

Yes. It runs in current mobile browsers on iOS and Android, with nothing to install.

🌧️

Free Noise Generator

Mix white, pink and brown noise with rain and ocean sounds, set a sleep timer that fades out, and download a loopable 1 to 60 minute WAV or MP3.

Runs in your browserNo sign-up, no pop-upsNo login requiredFree foreverMix white, pink, brown, rain and oceanSleep timer with fade-outDownload a loopable WAV or MP3

Start with your device volume low. Noise sounds quiet at first and it is easy to leave it too loud, especially with headphones or while you sleep.

Quick mixes

White noise0%

Bright, even hiss that covers speech and traffic.

Pink noise60%

Softer and more natural, like steady wind.

Brown noise40%

Deep and rumbling, like a fan or a waterfall.

Rain0%

Rain on a roof, made from filtered noise that flickers.

Ocean waves0%

Slow waves that swell and fade, made from filtered noise.

Volume30%

The slider is capped well below full scale and starts low.

Sleep timer

The sound fades out over the last 30 seconds, then stops.

Download a loopable file

Make a file of the current mix to play on a speaker, a phone or a sleep app. It is generated on your device and its end joins up with its start, so it repeats without a gap.

File length5 min

A 50.5 MB WAV (44.1 kHz stereo) or about 4.6 MB as a 128 kbps MP3.

🎧 The sound and the file are made in your browser. Nothing is uploaded.

How It Works

The page generates noise samples in your browser, filters and mixes them with WebAudio, and can render a loopable file of the mix on your device.

1
Mix your sound
Press a quick mix or move the "White noise", "Pink noise", "Brown noise", "Rain" and "Ocean waves" sliders. Keep the "Volume" low.
2
Play it
Press "Play". The noise loops without a gap. Pick a "Sleep timer" to fade it out and stop it for you.
3
Make a file
Choose a "File length" from 1 to 60 minutes and press "Make file". The page warns you if the file will be large.
4
Download it
Choose WAV or MP3 and press the download button to save a file that repeats seamlessly.

Sound and files are made in your browser tab. Nothing is uploaded.

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