Choose the Noise Color
Start with pink, or compare the brighter white spectrum and lower-weighted brown spectrum.
Noise spectrum workspaceLocal audio
Ready — sound is off
Current spectrumPink noise
Energy per octave is approximately balanced, with power falling as frequency rises.
Timer offBrowser audio signal toolkit
Pink Noise Generator
Generate continuous pink noise in the browser, compare it with white and brown noise, watch a live spectrum, set a listening timer, or export a short local WAV.
What Is Pink Noise?
Pink noise is a random signal whose power spectral density decreases as frequency rises, ideally following an inverse-frequency relationship. This means each octave carries roughly comparable energy even though higher octaves contain more individual hertz. A pink noise generator therefore sounds less bright than white noise through the same path. This implementation filters independent random samples with a multi-stage approximation designed to produce the intended downward spectral trend rather than merely reducing the volume of white noise.
The pink noise generator runs entirely in Web Audio. It fills a short stereo AudioBuffer, loops it continuously, applies a conservative master gain, and sends the result through an analyser for the on-screen spectrum. White and brown modes are included for direct comparison on this one page. The tool makes no promise about sleep, concentration, tinnitus, memory, or treatment; listeners may prefer a noise color for masking or relaxation, but that preference is not a guaranteed health outcome.
Three simple steps
How to Get Started
Use this pink noise generator deliberately: set the signal, begin quietly, and interpret only what the workflow can actually show.
Set Level and Timer
Lower device volume, choose a modest digital level, and optionally set an automatic session end.
Play and Observe
Start the local source, watch its real-time spectrum, stop at any time, or export a bounded WAV.
Pink Noise vs White Noise vs Brown Noise
White noise has approximately equal power per hertz, so the many high-frequency bins give it a bright character. Pink noise reduces power with rising frequency and is often discussed in terms of roughly equal energy per octave. Brown noise is produced here with a stabilized leaky integration process, emphasizing low frequencies more strongly. “Brown” refers to Brownian motion, not the color. All three remain random broadband test signals rather than musical tones with one stable pitch.
What the Spectrum Display Means
The canvas reads frequency-bin magnitudes from an AnalyserNode and places more horizontal space around lower frequencies for a useful visual overview. The trace changes constantly because noise is stochastic. It is not a calibrated spectrum analyser: windowing, FFT size, screen scaling, sample realization, browser implementation, and the absence of a microphone measurement all limit interpretation. It visualizes the generated digital stream before the speaker rather than measuring sound in the room.
Common Uses for an Online Noise Generator
Audio learners can compare spectral shapes and observe why equal power per hertz differs from an octave-balanced trend. Engineers and hobbyists can use short signals while tracing a path or making subjective checks for obvious buzzes and intermittent playback. Some people use steady broadband sound to mask variable background noise or to create a preferred listening environment. Results are personal and environmental; the pink noise generator does not guarantee improved work, rest, or sleep.
Audio Testing Use Cases
Pink noise is commonly useful as broadband source material because it exercises many frequencies at once without the bright balance of white noise. Still, this page cannot measure frequency response, equalize a room, set calibrated reference level, or reveal which physical component caused an audible problem. Those tasks need an appropriate measurement microphone, known gain structure, analysis software, and controlled methods. Use this signal as an input to an authorized workflow, not as a substitute for instrumentation.
Session Timer and Local Export
The timer can be off, use a common preset, or accept a custom value from one to 120 minutes. When enabled, the remaining time is announced in text and an optional gentle fade reduces the browser gain before stopping. WAV export is intentionally limited to 5, 10, or 30 seconds so memory use and file size stay reasonable. The export uses fresh samples, short edge fades, stereo channels, and the selected digital level without uploading data.
Output Level and Device Limitations
A displayed 12 percent is a browser gain setting, not 12 percent of a speaker’s acoustic capability and not a dB SPL value. Operating-system volume, amplifiers, headphones, speakers, equalizers, and rooms reshape the result. Brown noise can tempt users to raise volume when small hardware cannot reproduce deep frequencies; doing so may stress equipment or make higher components excessive. Keep both the device and tool controls low and accept the limits of the playback chain.
Safe Listening to Noise
Broadband signals distribute energy continuously and can become tiring even when they do not seem sharp. Begin quietly, take breaks, and stop at discomfort. Do not use noise to cover warning sounds or in situations requiring environmental awareness. The session timer is a convenience, not a safety meter. This pink noise generator cannot know the acoustic level at your ears, so users remain responsible for device volume, duration, transducer fit, and surroundings.
Clear answers
Frequently Asked Questions
Is pink noise just quieter white noise?
No. Pink noise has a different spectral distribution, with power decreasing as frequency rises. This tool uses a filter approximation rather than relabeling lower-volume white noise.
Why does the live spectrum keep moving?
Noise is random, and the analyser displays successive short windows. The overall trend matters more than any momentary peak.
Does pink noise improve sleep?
This tool makes no health or outcome claim. Some listeners prefer steady noise for masking, but responses vary.
Can this measure my speakers?
No. It supplies a digital source. Measuring acoustic response requires calibrated capture hardware and a defined method.