Is this noise generator really free?

Yes. The ToolKnit noise generator is 100% free with no signup, no ads, and no installation required. It runs entirely in your browser and works offline once loaded.

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

White noise has equal energy across all frequencies and sounds like TV static. Pink noise has more energy at lower frequencies and sounds like steady rain. Brown noise has even more low-frequency energy and sounds like a distant waterfall or ocean rumble. Brown noise is often preferred for sleep.

Can I mix multiple sounds together?

Yes. You can play all six sounds at the same time and adjust each one's volume independently. For example, mix brown noise at 70% with rain at 30% for a custom sleep soundscape.

How does the sleep timer work?

Set a timer for 15, 30, 60, or 90 minutes. The noise will play until the timer runs out, then fade out and stop automatically. Perfect for falling asleep without the sound playing all night.

Does it work on my phone?

Yes, the noise generator is fully responsive and works on iPhone, Android, and tablets. Tap the Play button to enable audio (mobile browsers require a user interaction before audio can play). You can lock your screen and the sound will continue.

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Noise Generator — White, Brown & Pink Noise

Mix 7 ambient sounds with independent volume controls. Set a sleep timer and drift off. 100% browser-based.

7 Sounds Mix & Layer Sleep Timer Presets No Signup

White Noise

Equal energy, TV static sound

60%

Brown Noise

Deep rumble, waterfall sound

60%

Pink Noise

Balanced, steady rain sound

60%

Rain

Steady rainfall on leaves

60%

Ocean

Waves rolling on the shore

60%

Wind

Gentle breeze through trees

60%

Thunder

Distant rolling thunderstorm

60%

Master 70%

Quick Presets

Sleep Timer

Shortcuts: Space Play/Stop

How to use the noise generator

Three simple steps — find your perfect soundscape.

Pick your sounds

Toggle on white, brown, or pink noise, or add natural sounds like rain, ocean waves, and wind. Each sound has its own volume slider.

Mix & adjust

Layer multiple sounds and fine-tune each channel. Use a preset for instant focus, sleep, or calm. The master volume controls overall loudness.

Set timer & relax

Hit Play and optionally set a sleep timer. The sound fades out automatically when the timer ends. Lock your screen — audio keeps playing.

Why use this noise generator?

7-Channel Mixer

Play all seven sounds at once and adjust each one independently. Combine brown noise with rain for sleep, or white noise with wind for deep focus. Your soundscape, your way.

Sleep Timer with Fade-Out

Set a 15, 30, 60, or 90 minute timer. The sound gently fades out over the last 10 seconds so you are not startled awake. Perfect for drifting off without running all night.

One-Click Presets

Deep Focus, Sleep Aid, Calm, and Reading — each preset activates the right sounds at the right volumes instantly. No fiddling with sliders required.

100% Private — Works Offline

All sounds are generated in your browser using the Web Audio API. No audio files are downloaded, no data is sent anywhere. Once loaded, it works completely offline.

Pro Tips

● Brown noise is better than white noise for sleep — the deeper frequencies mask background sounds more effectively without being harsh.
● Keep the volume at 40-60% — loud noise can damage hearing over time, even during sleep.
● Combine pink noise + rain for a natural soundscape that helps with tinnitus masking.
● Press Space to toggle play/pause hands-free while working.