White
Covering voices, office chatter, sudden noises. Brightest.
White, Pink & Brown Noise Generator
Endless noise generated in your browser — no streaming and no clicks at the loop point. Choose a colour or a purpose, set a timer that fades out gently, and leave it running.
Updated · 1 source
On iPhone, turn the Ring/Silent switch to Ring or the page will stay silent.
Keep it at a comfortable, quiet level — noise you play for hours should be well below conversation volume. For a baby’s room, keep the speaker across the room, not next to the cot.
1 · What is it for?
2 · Colour
Energy falls 6 dB per octave. A deep rumble like a waterfall or an aircraft cabin — what most people pick for sleep.
3 · Output and timer
STOPPED
Sit centred between the speakers. With Alternate on, the noise should jump cleanly from left to right at the same loudness. With Both, it should sound like it comes from one point in the middle — if it leans to one side, check the balance setting and speaker placement.
Short answer
White noise has equal energy at every frequency and sounds bright. Pink noise drops 3 dB per octave and sounds balanced, like rain; brown noise drops 6 dB per octave and sounds deeper, like a waterfall. Many people prefer pink or brown for sleep. Keep it quiet and set the fade-out timer so it does not play all night.
How to use it
- Pick a purpose or a colour. Sleep starts brown noise with a one-hour timer; Focus uses pink; Cover voices uses white; Speaker balance check alternates pink noise left and right.
- Set it quiet. Noise for hours should sit well below conversation level. If you have to raise your voice over it, it is too loud.
- Choose a timer. The last 30 seconds fade out so the stop does not wake you.
- Keep the tab open. The noise is generated live. On phones, keep the screen on or the browser may pause audio.
White noise vs pink noise vs brown noise
White, pink and brown noise are all random noise. What differs is how the energy is spread across frequencies:
| Colour | Spectrum | Sounds like | Good for |
|---|---|---|---|
| White noise | Flat — the same at every frequency | Hiss, a detuned radio | Covering voices and sudden sounds |
| Pink noise | Falls 3 dB per octave | Steady rain, wind | Focus, gentle sleep, speaker balance |
| Brown noise | Falls 6 dB per octave | Waterfall, aircraft cabin | Deep sleep sound, covering traffic rumble |
Each octave up contains twice as many frequencies, so flat white noise piles its energy into the treble and sounds bright. Pink noise compensates exactly, giving every octave the same energy — which is why it sounds even. Brown noise (also called red or Brownian noise) has the least hiss, which is why many people find it the most relaxing.
White noise for sleep
Pick Sleep to start brown noise with a one-hour timer, or choose any colour yourself. A few practical tips:
- Keep it quiet. It should sit well below conversation level. If you would have to raise your voice over it, turn it down.
- Use the timer. The last 30 seconds fade out, so it does not stop with a jolt.
- Keep the tab open. The noise is generated live. Some phones pause web audio when the screen locks — if yours does, download the WAV and loop it in a music app.
For a baby, keep the volume low and the speaker across the room rather than in or beside the cot.
Noise for focus and masking
Steady noise does not block sound — it masks it, making speech and sudden noises less noticeable. White masks voices best because speech lives in the midrange and treble. Pink is easier to listen to for hours. Pick whichever you can forget about.
Pink noise speaker test
Pink noise is the standard signal for checking speakers because it exercises every octave equally.
- Choose Speaker balance check. The noise alternates between left and right every two seconds.
- Sit centred between the speakers at your normal listening spot.
- Both sides should be equally loud and sound alike. If one is quieter or duller, check the balance slider, then swap the speakers — if the difference follows the speaker, that speaker is weaker.
- Switch to Both. The noise should seem to come from one point in the middle. If it leans, the levels or speaker distances differ.
How the noise is made
Everything is generated in your browser — this is a white, brown and pink noise generator in one page, not a recording. White noise is random samples; pink noise is filtered white noise with an even fall-off across octaves; brown noise is integrated white noise. A 20-second buffer loops with a crossfaded seam so there is no click. Nothing is streamed or uploaded.
Which colour for what
Pink
Focus, gentle sleep sound, speaker and room balance checks.
Brown
Deep sleep sound, covering traffic and low rumble. Least hiss.
If something sounds wrong
Stops when the phone locks
Some mobile browsers pause web audio in the background. Download the WAV and loop it in a music app instead.
Hiss is too harsh
Switch from white to pink or brown — same coverage, far less treble.
Balance check leans to one side
Check the system balance slider, then swap the speakers. If the lean follows the speaker, that speaker is weaker.
FAQ
What is the difference between white, pink and brown noise?
White noise has equal energy at every frequency and sounds bright. Pink noise drops 3 dB per octave and sounds balanced, like rain. Brown noise drops 6 dB per octave and sounds deep, like a waterfall.
Which noise is best for sleep?
It is personal. Many people prefer brown or pink noise because it has less hiss than white. Keep it quiet and use the timer so it is not playing all night.
Is white noise safe for babies?
Keep it quiet and put the speaker across the room, not in or next to the cot. Paediatric researchers have found some infant sound machines can be loud enough to be a concern at close range.
Why use pink noise to test speakers?
Pink noise has equal energy per octave, so it exercises the whole range evenly. Alternating it between left and right makes level and position differences easy to hear.
Does the noise loop?
It repeats every 20 seconds with a crossfaded seam, so there is no click, and the repeat is very hard to notice in random noise.
Sources
Related tools
Audio
Tone Generator
Play any frequency from 20 Hz to 20 kHz — sine, square, sawtooth or triangle, left or right.
AudioSpeaker Test
Check left, right, stereo, bass, and treble from the browser.
AudioHeadphone Test
Verify left/right channels, stereo image, and frequency response.
AudioFrequency Sweep
Sweep 20 Hz to 20 kHz, hunt rattles, or find the top of your hearing — tap to mark.