Noise Generator – White, Pink, Brown, Blue, Violet & Grey Noise
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
Coloured noise generator: white, pink, brown, blue, violet and grey
Each colour of noise has a different tilt across the spectrum. Pick one, adjust the level and use it for testing, masking or relaxation.
Blue noise
Blue noise rises 3 dB per octave, the mirror image of pink.
Violet noise
Violet (purple) noise rises 6 dB per octave.
Grey noise
Grey noise is shaped by an equal-loudness curve so it sounds equally loud across the range.
How to Use the
Noise Generator
- 01
Choose
pick a colour from the six buttons.
- 02
Level
keep the volume low; noise is fatiguing at high levels.
- 03
Channel
use left/right only to test each speaker with pink noise.
- 04
Stop
press the active button again.
Blue noise
Blue noise rises 3 dB per octave, the mirror image of pink. It is used in image and audio dithering because its energy sits where it is least visible or audible.
Violet noise
Violet (purple) noise rises 6 dB per octave. It sounds like a sharp hiss and is sometimes used for tinnitus relief at high frequencies.
Grey noise
Grey noise is shaped by an equal-loudness curve so it sounds equally loud across the range. Our version uses a simple filter approximation.
Noise colours compared
| Colour | Slope | Character |
|---|---|---|
| White | Equal energy per hertz | — |
| Pink | Equal energy per octave | — |
| Brown | Deep, −6 dB per octave | — |
| Blue | Bright, +3 dB per octave | — |
| Violet | Very bright, +6 dB per octave | — |
| Grey | Sounds equally loud at all pitches | — |
About noise signals
Definition and perception
Noise is a random signal with a defined average spectrum. The ear judges brightness by how much energy falls in the 2–8 kHz region, which is why white sounds harsh and brown sounds soft.
Applications
Masking, speaker and room calibration, hearing research, dithering and relaxation all use coloured noise.
Spectrum in other words
White: flat line; pink: falls gently; brown: falls steeply; blue and violet: rise; grey: shaped like an inverted hearing curve.
Related guides and fixes
Learn more in these guides: No sound on Windows, No sound on Mac, Headphones only one side, Speakers crackling, How to test speakers, How to test headphones.
Frequently Asked Questions
Q.Which noise is best for sleep?
Pink or brown for most people.
Q.Which is best for testing?
Pink for levels and balance, white for analysers.
Q.What is grey noise?
Noise shaped so all frequencies sound equally loud.