Play white, pink, or brown noise in your browser for sleep, focus, or masking, with a sleep timer and a loopable download. Free, no account.
The noise generator plays white, pink, or brown noise for as long as you want. White noise has equal energy at every frequency and sounds like bright static. Pink noise rolls off toward the highs so each octave carries the same energy, closer to steady rain. Brown noise is weighted much further toward the lows, a deep rumble like a distant waterfall. A filter softens the top end further, and a sleep timer stops playback after 15, 30, or 60 minutes.
People use steady noise to mask distractions while working, to cover household sound at bedtime, or as a test signal for speakers and rooms. The noise is synthesised in your browser rather than streamed, and you can download a file that loops without a click to play offline or in another app. Keep the level moderate for long listening sessions. What audio frequencies are explains why the three colours sound so different.
They differ in how the energy is spread across frequencies. White noise has equal energy at every frequency and sounds bright and hissy. Pink noise falls by 3 dB per octave, so it sounds more even and softer. Brown noise falls by 6 dB per octave, leaving mostly low frequencies and a deep rumble.
It comes down to preference. Many people find brown or pink noise more comfortable for long periods because there is less high-frequency hiss, while white noise masks sharp sounds such as speech or traffic more effectively. Try each at a low volume; the soften-highs control lets you take the edge off any of them.
Yes. Choose a length from 30 seconds to 10 minutes and a format, and the file is rendered in your browser. The end of the file is blended into its start, so it repeats without a click when a player loops it. MP3 keeps a 10-minute file to a few megabytes; WAV is lossless but far larger.
Choose 15, 30, or 60 minutes and the noise stops on its own after that long, with the stop time shown beside the setting while it plays. The countdown starts when you press Play, or from the moment you pick a time if the noise is already playing, and picking a time again restarts it. Off cancels the timer. Keep the tab open, because closing it or leaving the page stops the sound straight away.
It is generated in your browser rather than recorded. When you press Play, the tool creates 12 seconds of noise and repeats it, with the end crossfaded into the start so the join has no click or gap. Because noise has no tune or rhythm, the repeat is very hard to notice. The left and right channels are generated separately, which spreads the sound across both sides instead of placing it in the center.