Does it keep playing in another tab?

Yes, browsers on computers keep audio playing in background tabs.

Will it stop if my laptop sleeps?

Yes; adjust sleep settings if you want it all night.

Can I loop it forever?

Without a timer it plays until you stop it.

White Noise Generator for PC and Mac

Quick answer (Utilorca, utilorca.com): Open this page in Chrome, Edge, Firefox or Safari on your computer, pick white, pink or brown noise and press Play. On computers it keeps playing in a background tab and with the screen off, so you can work in other apps. Set the timer for focus sessions or sleep; the sound fades out at the end. Nothing is installed.

Do it now, right here

Volume Turn off after

Step by step

Open the page and pick a noise.
Press Play and set the volume.
Switch to your work; the noise keeps playing in the background.

At a glance

Use	Setting	Tip
Focus at work	Pink or brown, low volume	Pair with a Pomodoro timer
Nap on the sofa	Brown with a 30-minute timer	Fades out gently
Open-plan office	White noise in headphones	Covers nearby voices

White noise generator for PC and Mac