Why screens turn off
Most devices turn off the screen to save power, protect battery life, and reduce heat. That is usually helpful, but it can be frustrating when you are cooking from a recipe, watching a dashboard, reading reference material, or presenting to a room. Searching for “don't turn off screen” usually means you need a temporary override, not a permanent change to the whole device.
NoSleepScreen helps by requesting a screen wake lock in supported browsers. It is a no sleep screen tool for moments when you want the display to stay awake while the page is active.
Use a temporary wake lock first
Before changing system settings, try a temporary browser wake lock. Open the NoSleepScreen wake lock tool, press Start, and keep the tab open. If your browser supports the Wake Lock API, the tool will keep your screen on until you stop it, close the tab, or the browser releases the lock.
This is cleaner than forgetting to restore a long sleep timer later. It is especially useful on shared machines, work laptops, and devices where you do not want to change permanent settings.
When the tool may not work
Some browsers block wake lock requests, and some systems override them when battery saver is enabled. Managed school or business devices may also restrict power behavior. If the start button shows a blocked message, try a supported browser listed on the compatibility page.
For very long sessions, plug in the device and keep airflow clear. Keeping a screen always on uses more power, so use the stop button when the task ends.