Noise Generator — White to Grey
Free noise generator with white, pink, brown, blue, violet and grey sounds plus level control and live readout. For testing and masking. Runs in browser.
Protect your hearing. Start at a low volume. Never raise the volume to make a tone audible. Levels are shown in dBFS, relative to full scale — not SPL.
How it works
Noise is synthesised live in your browser inside an AudioWorklet. White noise is filtered to produce the pink, brown, blue, violet, and grey colors. Nothing is uploaded or recorded. Levels are reported in dBFS, relative to full scale.
A noise generator plays broadband sound that contains all frequencies at once. Instead of one pitch, you get a steady texture whose “color” describes how the energy is distributed from low to high. It is one of the most useful signals for testing speakers, headphones, and rooms, and for masking background sound. Everything is generated live in your browser with an AudioWorklet, so nothing is uploaded and nothing is recorded.
White noise generator
White noise has equal energy per hertz, which makes it sound bright and hissy. It is the reference signal for spectrum analysis because the energy is flat across the band, and it is the raw material for the filtered colors below.
Pink noise generator
Pink noise carries equal energy per octave: energy falls by about 3 dB per octave, so the low octaves hold as much energy as the high ones. Because hearing is roughly logarithmic, pink noise sounds even and natural, and it is the standard signal for room tuning and loudspeaker calibration.
Brown noise generator
Brown noise (also called red noise) falls by about 6 dB per octave, so it is dominated by low frequencies and sounds like a deep rumble, a waterfall, or distant thunder. It is a popular choice for masking and for testing subwoofers and bass drivers.
Blue, violet, and grey noise
Blue noise rises by 3 dB per octave and violet noise by 6 dB per octave, both emphasising high frequencies; they are useful for exercising tweeters and for masking low-frequency noise. Grey noise is a perceptually weighted blend of white and pink noise, designed to sound more even to the ear than either alone. Switch between all six colors to hear how each shapes the spectrum.
Aliases covered on this page: noise generator, white noise generator, pink noise generator, brown noise generator, and blue noise generator.
Frequently asked questions
What is a noise generator?
A noise generator produces a broadband signal containing every frequency at once, rather than a single pitch. Different "colors" shape how the energy is distributed across the spectrum.
What is the difference between white, pink, and brown noise?
White noise has equal energy per hertz and sounds bright. Pink noise has equal energy per octave, so energy falls by 3 dB per octave, and sounds balanced. Brown noise falls by 6 dB per octave and sounds deep and rumbling.
What are blue and violet noise?
Blue noise rises by 3 dB per octave and violet noise by 6 dB per octave, so both emphasise high frequencies. They are useful for testing tweeters and for masking low-frequency rumble.
What is grey noise?
Grey noise is a perceptually weighted blend of white and pink noise, designed to sound more even to the ear than either alone. It is an approximate perceptual weighting, not a laboratory equal-loudness contour.
Is this safe for my hearing?
Start at a low volume and never raise the volume to make the noise audible. High-frequency colors such as blue and violet can be uncomfortable. The tool plays only from a user gesture and provides a persistent Stop and Mute, and all levels are shown in dBFS, relative to full scale.
What is grey noise and how is it different?
Grey noise blends white and pink noise with perceptual weighting so it sounds more even to human ears than either parent color. White noise carries equal energy per hertz and sounds bright, while pink noise carries equal energy per octave and sounds balanced. Try grey when white feels harsh but pink feels dull.