White, Pink and Brown Noise Generator

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download white noise wav

Download white, pink or brown noise as WAV

Open Download WAV, choose the length and channels and click Generate. The file is computed on your device in 10-second blocks, with the size shown beforehand, and it never repeats.

Format, size and limits

The file is an uncompressed WAV: 16-bit PCM at 44,100 samples per second. Each sample takes 2 bytes, so one minute in stereo takes 60 x 44,100 x 2 x 2 = 10,584,000 bytes, about 10.6 MB, and in mono half of that, 5.3 MB. The header is 44 bytes and already carries the total size, which the tool knows beforehand. Because it uses no compression, WAV suits noise well: lossy formats like MP3 discard part of the spectrum and change precisely the slope that defines the color.
There are two writing modes. On desktop Chrome and Edge the tool uses the browser file picker and writes each block straight to disk, which allows 1 minute to 4 hours (2.54 GB in stereo) without using memory. In other browsers, or inside another site, the file is built in memory and downloaded at the end; in that mode the limit is 200 MB, about 18 minutes in stereo or 37 in mono. The WAV format, because it uses a 32-bit field, cannot exceed 4 GiB, which would be about 6.8 hours in stereo at 44.1 kHz.
What goes into the file is your mix: color, level, rain, wind, ocean and fan layers, stereo width and fade in and out. The master volume control is not included, so the file plays at the volume of whoever listens. Each block continues the filter state of the previous one, so the audio has no seam or loop, and the generator uses a new random seed for each file. To listen for hours, generate 10 to 30 minutes and turn on your player's repeat.

Calculated file sizes

1 minute, stereo

Input: 60 s x 44100 Hz x 4 B
Expected output: 10584044 bytes

About 10.6 MB with the 44-byte header.

10 minutes, stereo

Input: 600 s
Expected output: 105840044 bytes

About 106 MB.

30 minutes, mono

Input: 1800 s x 44100 Hz x 2 B
Expected output: 158760044 bytes

About 159 MB, fits the 200 MB memory limit.

4 hours, stereo

Input: 14400 s
Expected output: 2540160044 bytes

About 2.54 GB, only when writing straight to disk.

In-memory limit

Input: stereo
Expected output: 18 min = 190.5 MB

19 minutes would exceed 200 MB.

Full tool FAQ

What is the difference between white, pink and brown noise?

It is how energy is distributed across frequencies. White has equal power in every hertz and sounds hissy and bright. Pink falls 3.01 dB per octave and has equal energy in every octave, sounding more balanced, like steady heavy rain. Brown falls 6.02 dB per octave and sounds deep and muffled, like a distant waterfall. The chart in the tool shows these lines live.

What are blue, violet and grey noise?

Does white noise help you sleep or concentrate?

What volume should I use?

How does the sleep timer work?

How do I download the noise as WAV and how big is the file?

Are the rain, wind and ocean sounds recordings?

What is the dashed line on the chart?

Does it play with the screen locked or the tab in the background?

Do my presets and data leave my device?

Frequently asked questions

Can I download it as MP3?

No, WAV only. For noise, lossy compression gets in the way: it discards parts of the spectrum and changes the slope of the color. If you need MP3, convert the WAV with an audio converter.

Does the file have a seam or repeat?

No. The file is generated continuously, with the filters keeping their state from one block to the next, and it starts with a fade in. It is not a short stretch repeated.

Why does generation take a while?

The noise is truly computed, sample by sample, on your device. An hour in stereo has over 317 million samples counting both channels. A progress bar shows the advance and the Cancel button stops the generation.

Next steps

Format, size and limits

The file is an uncompressed WAV: 16-bit PCM at 44,100 samples per second. Each sample takes 2 bytes, so one minute in stereo takes 60 x 44,100 x 2 x 2 = 10,584,000 bytes, about 10.6 MB, and in mono half of that, 5.3 MB. The header is 44 bytes and already carries the total size, which the tool knows beforehand. Because it uses no compression, WAV suits noise well: lossy formats like MP3 discard part of the spectrum and change precisely the slope that defines the color.

There are two writing modes. On desktop Chrome and Edge the tool uses the browser file picker and writes each block straight to disk, which allows 1 minute to 4 hours (2.54 GB in stereo) without using memory. In other browsers, or inside another site, the file is built in memory and downloaded at the end; in that mode the limit is 200 MB, about 18 minutes in stereo or 37 in mono. The WAV format, because it uses a 32-bit field, cannot exceed 4 GiB, which would be about 6.8 hours in stereo at 44.1 kHz.

What goes into the file is your mix: color, level, rain, wind, ocean and fan layers, stereo width and fade in and out. The master volume control is not included, so the file plays at the volume of whoever listens. Each block continues the filter state of the previous one, so the audio has no seam or loop, and the generator uses a new random seed for each file. To listen for hours, generate 10 to 30 minutes and turn on your player's repeat.

Calculated file sizes

1 minute, stereo

Input: 60 s x 44100 Hz x 4 B
Expected output: 10584044 bytes

About 10.6 MB with the 44-byte header.

10 minutes, stereo

Input: 600 s
Expected output: 105840044 bytes

About 106 MB.

30 minutes, mono

Input: 1800 s x 44100 Hz x 2 B
Expected output: 158760044 bytes

About 159 MB, fits the 200 MB memory limit.

4 hours, stereo

Input: 14400 s
Expected output: 2540160044 bytes

About 2.54 GB, only when writing straight to disk.

In-memory limit

Input: stereo
Expected output: 18 min = 190.5 MB

19 minutes would exceed 200 MB.

Full tool FAQ

What is the difference between white, pink and brown noise?

What are blue, violet and grey noise?

Does white noise help you sleep or concentrate?

What volume should I use?

How does the sleep timer work?

How do I download the noise as WAV and how big is the file?

Are the rain, wind and ocean sounds recordings?

What is the dashed line on the chart?

Does it play with the screen locked or the tab in the background?

Do my presets and data leave my device?

Frequently asked questions

Can I download it as MP3?

No, WAV only. For noise, lossy compression gets in the way: it discards parts of the spectrum and changes the slope of the color. If you need MP3, convert the WAV with an audio converter.

Does the file have a seam or repeat?

No. The file is generated continuously, with the filters keeping their state from one block to the next, and it starts with a fade in. It is not a short stretch repeated.