https://nosleep.page/

nosleep.page

nosleep.page

This tiny site uses the Screen Wake Lock API to prevent your device
from sleeping.

Where this API isn't supported, an empty silent video is played to
emulate this behaviour (using NoSleep.js).

[ ] Prevent device sleeping
This site can only prevent your device sleeping if it's in a
foreground tab.
It doesn't need to be visible, but you can't minimise or switch to a
different tab within this window.