FIRST CH TOOLS LOCAL PROCESSING — NOTHING IS UPLOADED 日本語

FIRST CH TOOLS / Misc / 70 STAY AWAKE

Stay Awake — Keep the Screen On

A long build, an AI agent run, a video export. While you wait, one button stops the screen from dimming and switching off. It works only while this tab is open and showing. Nothing to install, and closing the tab puts everything back as it was.

1 — KEEP THE SCREEN ON

0:00:00

2 — STATUS

OFF
Status
—
Turned on at
0:00:00
Time the screen was actually held on
0
Re-acquired after the tab came back

This stops the screen from dimming and turning off — nothing more. It does not stop the computer itself from sleeping (closing the lid, choosing Sleep from the menu), and it pauses while you are on another tab or the window is minimised. The on/off state and the timer are never stored or sent; it all happens inside this page.

How to Use

  1. Keep this page openBefore you start the build or the agent, open this page in its own window. Make the window small and park it in a corner of the screen so it stays out of the way.
  2. Turn it onPress the button: the screen stops dimming and the timer starts. The tab title shows “● 0:12:34” as well, so you can tell which tab it is.
  3. Turn it off or close the tab when you are doneTurning it off, closing the tab or going to another page all release it, and nothing is left behind. While you look at another tab it pauses, and it resumes by itself when you come back.

About This Tool

It uses the browser's Screen Wake Lock API — the same thing that keeps the screen on while a video plays — behind a single button. There is no background app or extension to install, and the browser does not ask for any permission. What it stops is the screen dimming and then switching off after a while without input.

It works only while this tab is open and showing. Switching to another tab, minimising the window or covering it completely with other windows makes the tab “hidden”, and the browser then releases the lock by itself. The browser does not take it back when the tab is shown again, so this page watches for that (visibilitychange) and asks again. The number of times that happened is shown, and the time the screen was actually held on is shown separately from the elapsed time.

It does not stop the computer from sleeping. Closing the lid or choosing Sleep from the menu puts it to sleep as usual. If you want the computer to keep running while the screen goes off, use your operating system: the caffeinate -i command on a Mac, or the Power & sleep settings on Windows.

Browsers and caveats. Works in Chrome and Edge 84+, Safari 16.4+ (Mac, iPhone, iPad) and Firefox 126+. On iPhone and iPad every browser runs on Safari's engine (WebKit), so iOS / iPadOS 16.4 or later is needed. Web apps added to the Home Screen do not get it on iOS 18.3 and earlier (open the page in a Safari tab instead; it was fixed in iOS 18.4). In Low Power Mode on iPhone, or Battery Saver on Android and laptops, the browser may refuse or later drop the lock; the page says so when it happens. The API only works on HTTPS pages, so a saved copy opened from your disk will not work.

The on/off state and the timer are never sent or stored. All this tool does is ask the browser not to turn the screen off. The on/off state and the timer live only in this tab and disappear when you close it.

Related tools. To tell people in other regions when an export will finish, use the Timezone Converter; to put the end of a build in a calendar, the ICS Generator; for notes while you wait, the New Tab Memo.

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