Free Online Noise Machine

The noise colors

• White — Flat, full hiss.
• Pink — Balanced, softer.
• Brown — Deep low rumble.
• Blue — Bright, airy hiss.
• Green — Mid-focused.

Every color here is generated from scratch with the Web Audio API the moment you press play — there are no sound files to load and nothing leaves your device. That is also why it keeps working offline once the page has loaded.

How to choose a noise color

The colors differ only in how their energy is spread across the frequency range, which is what makes each one sound brighter or deeper.

• White noise has equal energy at every frequency, so it sounds bright and hissy, like an untuned radio or a fan on high. It covers the widest range of sound, which makes it useful for masking sudden or high-pitched noise.
• Pink noise shifts energy toward the lows and rolls off the highs (about 3 dB per octave), so it sounds softer and more balanced, closer to steady rain or wind. Many people find it the easiest to leave on for hours.
• Brown noise (also called red noise) cuts the highs more steeply, leaving a deep, low rumble like heavy surf or a plane cabin. It is the warmest and least harsh of the colors.
• Blue and green are more specialized: blue is thin and treble-heavy, green is weighted toward the middle. Most people reaching for background sound stay with white, pink, or brown.

There is no single best color; the right one is whichever fades into the background fastest for you. For sleep, brown and pink are popular because the deeper tone is easy to drift off to. For studying or focus, both cover chatter without a sharp edge. To mask a specific sound, match the brightness: white for high-pitched noise, brown for low rumbles.

Using the sleep timer and waves

The sleep timer stops playback automatically after the length you choose (5 minutes to 2 hours), so you can fall asleep without leaving audio running all night. The optional Waves switch adds a slow rise and fall in volume that some find more soothing than a perfectly flat sound. Leave both off for steady, constant noise.

Frequently asked questions

What is the difference between white, pink, and brown noise? All three are steady, non-repeating sound. White is the brightest, with equal energy everywhere; pink is softer and more balanced; brown is the deepest, with the treble pulled back for a low rumble.

Does it need to download anything? No. Every color is synthesized live in your browser with the Web Audio API. There are no sound files, and nothing is sent to or from your device once the page has loaded.

Can I set it to stop after I fall asleep? Yes. Pick a length from the Sleep timer menu and playback stops on its own when the time is up.

Is any color better for tinnitus or babies? Some people find steady noise helpful for masking, but this is a plain sound generator, not a medical device. For tinnitus an audiologist can advise, and for infants follow your pediatrician's guidance on safe sound levels.