A free online noise generator with WAV export
This noise generator plays and exports six colours of noise straight from your browser — free, with no account and nothing to install. Everything is synthesised live on your own device, so playback never buffers and no audio is uploaded anywhere.
It is built for people who need the file as well as the sound: export at sample rates up to 96 kHz with 16-bit, 24-bit, or 32-bit float precision, mono or stereo, with the duration set to the millisecond. That covers everything from a ten-second test signal for speaker calibration to an hour-long masking loop for sleep.
Why use this online white noise generator
- It never loops. Most white noise sites and apps play a recording that repeats every few minutes, and the ear learns to hear the seam. This noise is synthesised sample by sample, so there is no repeat point.
- Sleep timer with a fade-out. Pick 15 minutes to 8 hours and the noise fades out gently over the last ten seconds instead of cutting off.
- Six colours, one click apart. If white noise feels too hissy, switch to pink or brown without reloading or losing your timer.
- Download it as a file. Export any colour as an uncompressed WAV for a sleep playlist, a video, or a speaker test.
- Free, private, no sign-up. Everything runs on your device; no audio is streamed or uploaded.
All Six Noise Colors
White Noise
Equal energy across all frequencies. Sounds like steady "hiss" or radio static. Perfect for audio testing, speaker calibration, and sleep aids. For a dedicated player and a fuller explanation, see the white noise generator.
Pink Noise
Equal energy per octave (3dB/oct decrease). Sounds like rainfall or wind. Industry standard for room acoustics testing and speaker calibration. More natural to human hearing than white noise. The pink noise generator covers the calibration workflow in detail.
Brown Noise (Brownian/Red)
Energy decreases 6dB per octave. Deep, rumbling sound like a waterfall or distant thunder. Popular for relaxation, meditation, and focus work. Named after Brownian motion, not the color. The brown noise generator explains why so many people prefer it for sleep.
Blue Noise
Energy increases 3dB per octave. Bright, hissy quality with emphasis on high frequencies. Useful for dithering in digital audio, high-frequency testing, and special audio effects.
Violet Noise (Purple)
Energy increases 6dB per octave. The sharpest noise type with maximum high-frequency content. Used for tinnitus relief (for high-frequency tinnitus) and specialized audio engineering applications.
Grey Noise
Perceptually flat noise based on equal-loudness curves. Designed to sound uniform across the spectrum to human ears, accounting for the ear's varying sensitivity to different frequencies. Useful for psychoacoustic testing and tinnitus masking — the grey noise generator compares it directly against white and pink.
Export Features
- Precise Duration: Set exact length down to milliseconds
- Professional Sample Rates: 22.05kHz, 44.1kHz, 48kHz, or 96kHz
- High Bit Depth: 16-bit, 24-bit, or 32-bit float for maximum quality
- Mono or Stereo: Export single channel or stereo files
- WAV Format: Uncompressed, lossless audio format compatible with all DAWs
- Progress Tracking: Real-time progress bar during export
How to Export Noise Files
- Select noise type: Choose from six professional noise colors
- Set duration: Enter the exact length you need (minutes:seconds.milliseconds)
- Configure export: Choose sample rate, bit depth, and mono/stereo
- Click Export: The browser will generate and download your WAV file
- Use in your DAW: Import the file into any audio software
Technical Implementation
This tool uses mathematically accurate noise generation algorithms. White noise is true random generation. Pink noise uses Paul Kellett's refined filter method. Brown noise implements Brownian motion. Blue and violet use differentiation methods. Grey noise combines filtering with perceptual weighting. All audio is generated in real-time in your browser—no server processing required.
WAV export creates industry-standard files with proper headers, bit depth conversion, and sample rate matching. 32-bit float export uses IEEE floating-point format for maximum dynamic range and zero quantization error. All processing is done locally for privacy and speed.
Not sure which colour you want? The guide to the colors of noise walks through how each one sounds, what its spectrum does, and which tasks it suits.
Frequently asked questions
Which noise colour is best for sleep?
There is no single best colour; it depends on what you need to cover and what you find tolerable. White noise masks the widest range of sounds but can feel hissy. Pink noise is softer and more balanced. Brown noise is the deepest and is the most popular choice for sleep and for covering low rumbles such as traffic. Try each for a minute at a low volume and keep the one you notice least.
Is this online noise generator free?
Yes. Playback, the sleep timer and WAV downloads are all free, with no account, no trial and no watermark. The noise is generated on your own device, so nothing is streamed or uploaded.
Does the noise loop or repeat?
No. Every sample is calculated live from a random number generator, so the sound never repeats. Downloaded WAV files are also generated rather than copied from a recording.
How does the sleep timer work?
Choose a duration before or during playback. The countdown starts when the noise starts, fades the sound out smoothly over the final ten seconds, and then stops playback. Switching noise colour does not reset the timer.
Can I download white noise as an MP3?
The generator exports WAV, which is uncompressed and plays on every phone, computer and editing app. If you need MP3 for a smaller file, any audio converter can convert the WAV without noticeable loss for noise.