Free online white noise generator with pink noise and brown noise. Synthesizes ambient sound in your browser using the Web Audio API — no download, no ads, works offline.
White Noise
Equal energy at all frequencies — sounds like static. Ideal for masking sharp sounds and improving concentration.
Press Space to play / pause
No timer set
White Noise Generator is a free, browser-based ambient sound synthesizer that creates white, pink, brown, rain, ocean, and fire sounds entirely in real time using the Web Audio API. Unlike noise apps and websites that stream pre-recorded audio files (which require constant bandwidth and may contain ads), this tool generates all sound mathematically in your browser — no audio files are downloaded, no data is transmitted, and it works completely offline after the page loads. The synthesized noise is continuous and seamless with no loops, clicks, or gaps. Customize the frequency balance with bass, mid, and treble EQ sliders, set a sleep timer for automatic shutoff, and adjust volume to your preference. All settings persist in your browser between sessions.
White Noise — Equal energy at every frequency (20 Hz–20 kHz). Sounds like static or an untuned radio. Most effective for masking sudden, sharp sounds (door slams, keyboard clicks, phone rings). The broadband coverage blocks a wide range of distracting frequencies simultaneously.
Pink Noise — Equal energy per octave, with power decreasing at 3 dB per octave as frequency increases. Sounds like steady rainfall or a waterfall. More natural-sounding than white noise. Research published in Frontiers in Human Neuroscience found pink noise during sleep may enhance memory consolidation and improve deep sleep quality.
Brown Noise — Power decreases at 6 dB per octave, producing deep, rumbling sound like strong wind or ocean waves. Named after Brownian motion (not the color). Widely reported by ADHD communities as the most effective noise color for sustained focus. The strong low-frequency emphasis creates a "cocooning" effect that many find deeply calming.
Rain / Ocean / Fire — Synthesized ambient soundscapes based on filtered noise with characteristic modulation patterns. Rain uses filtered white noise with random droplet impulses. Ocean applies rhythmic amplitude modulation to brown noise. Fire uses brown noise with random high-frequency crackle bursts.
Ambient noise improves focus through a mechanism called stochastic resonance — a moderate amount of background noise can actually enhance signal detection in neural systems, helping the brain maintain attention on a primary task. A landmark 2012 study in the Journal of Consumer Research found that moderate ambient noise (~70 dB) enhanced creative thinking compared to both silence and high noise levels. The key is consistency: unpredictable sounds (conversations, notifications) are distracting, while steady-state noise (white/pink/brown) masks those interruptions without introducing new ones. For analytical tasks, pink or brown noise is generally preferred over white noise because the lower-frequency emphasis is less fatiguing during extended listening.
Essential terms and definitions related to White Noise Generator.
A random signal with equal intensity at every frequency in the audible spectrum (20 Hz–20 kHz). The term "white" is an analogy to white light, which contains all visible wavelengths. Statistically, white noise has a flat power spectral density. It sounds like static and is used to mask environmental sounds, aid sleep, and improve concentration.
A random signal with equal power per octave — the power decreases at 3 dB per octave as frequency increases. Pink noise contains more low-frequency energy than white noise and sounds like steady rainfall, a waterfall, or wind. It is the most studied noise type for sleep research, with studies showing it may enhance slow-wave (deep) sleep and memory consolidation.
Also called red noise, brown noise has power that decreases at 6 dB per octave, resulting in predominantly low-frequency sound. The name comes from Brownian motion (random walk), which has this spectral characteristic. Brown noise sounds like deep ocean waves, strong wind, or distant thunder. Many people with ADHD report brown noise helps them focus.
A high-level JavaScript API for processing and synthesizing audio in web browsers. It provides a modular routing system where audio sources, effects, and outputs are connected in a graph. AudioContext is the main object representing the audio processing graph. It enables applications like this white noise generator to synthesize audio in real-time without any audio files.
White noise contains equal power at every frequency across the audible spectrum — it sounds like static or an untuned radio. Pink noise has equal power per octave, meaning it emphasizes lower frequencies — it sounds like steady rainfall or a waterfall and is the most studied noise color for sleep and focus. Brown noise (named after Brownian motion) has even stronger low frequencies — it sounds like deep wind, ocean waves, or distant thunder. Many people find brown noise the most pleasant for extended listening.
Research suggests white and pink noise can improve cognitive focus, particularly in noisy open-plan office environments. The mechanism is "stochastic resonance" — background noise can mask distracting environmental sounds, reducing cognitive load. A 2014 study in Psychological Science found moderate ambient noise (around 70 dB) can boost creative thinking. For focused analytical work, pink or brown noise is generally preferred over white noise due to its more pleasant tonal character.
Yes, at moderate volumes. The key is keeping volume below 85 dB to prevent hearing fatigue — listening to anything loudly for extended periods can cause temporary or permanent hearing damage. For background focus use, set the volume to a level where you can comfortably hold a conversation. Never use headphones at full volume for extended periods.
All noise types are synthesized in real-time using the Web Audio API's AudioContext and a ScriptProcessorNode (or AudioWorklet). White noise is generated by filling audio buffers with uniformly distributed random values. Pink noise applies a filtering algorithm to white noise to achieve the -3 dB/octave roll-off. Brown noise applies further low-pass filtering to achieve the -6 dB/octave slope. No audio files are downloaded — the sound is created entirely by mathematics.
Yes. The White Noise Generator uses a separate Web Audio context from other browser audio. However, the mixing happens at the system level, so the total volume depends on both sources. For best results, lower the system volume of other applications when using noise for focus, or use the generator as your primary audio source through headphones.
