White Noise Generator – Free Online White Noise for Sleep, Focus & Testing
Continuous noiseReady
- Start quiet, raise slowly
- Check L/R markings first
- Disable audio enhancements
- Runs inside your browser
- No upload, no account
- Nothing saved after you close
White noise generator online
White noise is a steady hiss with equal energy at every frequency. It is the classic signal for masking distracting sounds and for testing the full range of a system.
What is white noise?
White noise contains every frequency at the same intensity per hertz.
White noise for sleep, focus and babies
A steady sound masks sudden noises that wake you.
White noise for audio testing
Because its spectrum is flat, white noise exercises tweeters strongly and is used with spectrum analysers to measure response.
How to Use the
White Noise
- 01
Volume
start low; noise is broadband and can be fatiguing.
- 02
Play
press White to start endless noise; press again to stop.
- 03
Compare
switch between the six colours to hear the tonal difference.
- 04
Timer
use the sleep timer for a fade-out after a set time.
What is white noise?
White noise contains every frequency at the same intensity per hertz. Because higher octaves contain more hertz, it sounds bright and hissy, like a detuned radio.
White noise for sleep, focus and babies
A steady sound masks sudden noises that wake you. Keep it quiet: for infants, health guidance suggests keeping machines well away from the cot and below about 50 dB. Use the decibel meter to check the level.
White noise for audio testing
Because its spectrum is flat, white noise exercises tweeters strongly and is used with spectrum analysers to measure response.
White noise and tinnitus
Many people with tinnitus use low-level noise to make ringing less noticeable. Choose the colour that feels most comfortable rather than the loudest.
White noise in practice
Definition in plain words
White noise is random sound with a bright tilt across the spectrum.
Perception
Most listeners describe it as a hiss.
Common uses
Masking distractions, sleep, focus, tinnitus relief and checking speakers.
Compare at a comfortable level
Switch colours at the same volume setting; brighter noise seems louder even at equal energy.
A practical target: quiet at the crib
For babies keep the level around 50 dBA at the crib: measure with the decibel meter where the baby sleeps.
Placement and timers
Place the machine across the room, not next to the head, and use a timer so it fades after sleep begins.
Mask peaks, don’t erase the world
The goal is to soften sudden noises, not to drown out everything; the lowest effective level is best.
Crib measurement routine
Two-minute crib measurement
Place the phone at the baby’s head position and measure for two minutes.
Placement rules
Across the room, away from the cot, speaker facing away.
Timer strategy
Run for the first sleep cycle rather than all night.
Measure again if unsure
Recheck after moving the machine.
White noise for babies: volume and placement
Paediatric guidance generally recommends keeping sound machines quiet (often cited as below about 50 dB at the crib), placing them well away from the crib, and using a timer. Measure at crib level with the decibel meter and place the source at least two metres away.
Related guides and fixes
Learn more in these guides: White vs pink vs brown noise, No sound on Windows, No sound on Mac, Headphones only one side, Speakers crackling, How to test speakers.
Frequently Asked Questions
Q.Is white noise safe to sleep with?
Yes at a low level. Keep it quieter than normal conversation.
Q.Does it loop?
It is generated live from a 4-second random buffer; the loop is inaudible.