Free online white noise generator
This white noise generator plays true broadband white noise straight from your browser — no app, no account, and nothing to install. Press play, set the level with the volume slider, and the sound is synthesised live by the Web Audio API on your own device. Nothing is streamed, so playback does not stall on a slow connection and does not consume data while it runs.
White noise is the reference point everyone else is measured against: equal energy at every frequency, from the lowest rumble the speaker can manage up to the top of your hearing. That is why it is the default choice for masking a noisy room, testing a signal path, or covering the gaps in a quiet house at night.
What white noise actually is
A white noise signal is random, and its randomness is spread evenly across the spectrum. Take any two frequency bands of equal width — 100 to 200 Hz and 10,000 to 10,100 Hz, say — and each contains the same average power. The name is borrowed from white light, which is a roughly even mix of visible wavelengths.
Because human hearing does not weight frequency bands evenly, flat on a meter does not mean flat to the ear. We hear roughly in octaves, and each higher octave in a white signal covers twice the bandwidth of the one below it, so it carries twice the energy. That is why white noise sounds distinctly bright and hissy rather than neutral, and why pink noise is usually preferred whenever "balanced" is the goal.
What white noise sounds like
Most people describe it as a steady hiss: an untuned FM radio, a fan on high, air escaping a nozzle, or the sound between stations on an old television. There is no pitch, no beat, and no pattern to latch onto, which is precisely what makes it effective at covering other sounds. Unlike a recording of rain or a fan, a generated signal never loops, so there is no repeat point for your ear to start anticipating.
What people use white noise for
- Sleep and sound masking: covering traffic, a snoring partner, thin walls, or a hotel corridor. A steady floor of sound stops sudden noises from standing out sharply enough to wake you.
- Focus in open-plan spaces: raising the ambient level so that nearby speech becomes unintelligible. Intelligible speech is far more distracting than the same sound level of undifferentiated noise.
- Tinnitus relief: a low-level broadband signal can make internal ringing less prominent by giving the auditory system something external to attend to.
- Audio and speaker testing: the simplest way to confirm that a signal path passes the full bandwidth and that both channels behave the same way.
- Dithering and DSP work: white noise at a very low level is the standard dither signal when reducing bit depth.
- Infant settling: widely used, but keep the level conservative and the source well away from the cot.
White noise vs pink and brown noise
The three most commonly used colours differ only in how the energy is tilted across the spectrum. Every one of them is available in the Harmonoise noise generator.
| Colour | Spectral slope | Character | Typically used for |
|---|---|---|---|
| White | Flat (0 dB/octave) | Bright, hissy | Masking, broadband testing, dithering |
| Pink | −3 dB/octave | Balanced, like steady rain | Room and speaker calibration, long listening |
| Brown | −6 dB/octave | Deep, like a waterfall | Sleep, deep masking, low-end warmth |
| Grey | Equal-loudness weighted | Perceptually even | Hearing tests, tinnitus therapy |
If white noise feels fatiguing after an hour, the usual fix is to step down the spectrum rather than down the volume: pink first, then brown. The full breakdown, including blue and violet, is in the guide to the colors of noise.
How to download white noise as a WAV file
- Open the noise generator with white selected.
- Set the duration you need, down to the millisecond — ten seconds for a test tone, an hour for an overnight loop.
- Choose a sample rate (44.1 kHz for general use, 48 kHz for video, 96 kHz for measurement work) and a bit depth.
- Pick mono or stereo. Stereo generates two independent noise streams, which sounds wider and more natural over speakers.
- Click Export WAV File. The file is rendered locally and downloaded straight to your device.
The result is an uncompressed WAV with correct headers, so it imports cleanly into any DAW, video editor, or media player, and it loops without a seam.
Choosing a safe listening volume
Almost every "which noise should I use" question turns out to be a loudness question. Broadband noise is unusually easy to set too loud, because it has no peaks or transients to make the level obvious. Start quieter than feels right, then raise it only until it just covers whatever you are trying to mask. For all-night playback, a level you could comfortably talk over is a sensible ceiling, and headphones deserve more caution than speakers.
How this generator makes white noise
Each output sample is drawn independently from a uniform random distribution between −1 and ±1, at your device's audio sample rate, with the left and right channels generated separately. That independence is what gives the signal its flat average spectrum and its wide stereo image. All of it runs locally through the Web Audio API — no audio is recorded, uploaded, or sent anywhere.
Frequently asked questions
Is white noise safe to sleep with every night?
For most adults, yes, provided the level is moderate. The usual guidance is to keep continuous overnight playback at conversational level or below and to place the speaker away from your head rather than beside your pillow. For infants, paediatric guidance is more conservative still: keep the source across the room and the level low. Any masking sound loud enough to be uncomfortable is too loud, whatever its colour.
What is the difference between white noise and static?
Practically none, at least in origin. The hiss from an untuned analogue radio or a detuned TV is broadband noise generated by thermal and atmospheric randomness, which has a roughly flat spectrum — the same spectrum this generator produces deliberately. The difference is that a generated signal is clean and consistent, with no drifting stations bleeding through it.
Does white noise actually help concentration?
It helps by masking rather than by soothing. A steady broadband sound raises the noise floor of a room so that intermittent sounds — a conversation two desks away, a door, traffic — no longer stand out sharply against silence. Many people find pink or brown noise less tiring for this over several hours because white noise puts a lot of energy in the region the ear is most sensitive to.
Can I download the white noise as a file?
Yes. The full noise generator exports white noise as an uncompressed WAV at 22.05, 44.1, 48 or 96 kHz, in 16-bit, 24-bit or 32-bit float, mono or stereo, with the duration set to the millisecond. Everything is rendered in your browser, so nothing is uploaded and there is no queue or watermark.