Keep Screen On Not Working? Browser Wake Lock Troubleshooting

You enabled Keep Screen On, but the display still went dark. Start with when it happened: before activation, at the end of a countdown, or after leaving the page. That distinction makes the next check more useful than repeatedly pressing the button.

This checklist is for failures while using the tool. For how browser wake locks work, read the browser guide; for longer system-wide settings, use the screen-timeout guide.

Match the symptom first

What you notice	Start here
The button is unavailable or activation shows an error	Check custom minutes and the browser test below
The session stops after 15, 30 or 60 minutes, or 2 hours	Check whether a countdown was selected
It works until you switch tabs, minimize the browser or open another app	Return to the tool and restart the test
The timer keeps running, but the screen still turns off	Test the display itself, not the timer
The screen goes black while you are typing or moving the mouse	Follow the separate black-screen diagnosis

Run one controlled idle test

1. Open the tool homepage directly at https://keep-screen-on.com in a full browser window. If you arrived inside a messaging or social app, open that same address in your browser instead.
2. With the tool off, note your normal display timeout. If necessary, observe one idle timeout, then unlock the device and return. Do not change system settings during this comparison.
3. Select the option with no time limit. If using custom duration instead, enter a positive number of minutes; an empty or invalid value disables the start button.
4. Activate the tool and note any error. Keep this tool tab selected, the browser visible and the laptop lid open. Leave the keyboard, mouse and screen untouched for longer than the timeout you observed.
5. Record whether the display stayed lit. Stop the tool afterward. Repeat only after changing one condition, so you can tell what helped.

If your system is already set never to turn off the display, staying lit does not demonstrate that the tool works. The comparison needs a known idle timeout. A successful test describes those conditions; it does not guarantee every future session.

Did a countdown end the session?

A selected preset or custom duration is meant to stop the tool automatically. If it stopped at that interval and returned to its inactive state, start a new session with a longer duration or no time limit. The display can then turn off under its normal settings; it need not go dark exactly when the countdown ends.

Distinguish a remaining-time countdown from an elapsed-session timer before diagnosing a browser failure. The current controls offer 15 minutes, 30 minutes, 1 hour, 2 hours and a custom duration.

Does activation fail even with the page visible?

Write down the error before reloading. Check that the address starts with HTTPS, update the browser if an update is available, then run the same idle test in that browser. If there is no supported method available, repeating the button press is not a fix.

If the battery is low, connect power. If you choose to temporarily turn off battery saver for comparison, restore it afterward. Change one condition at a time: power-related policy can deny a request, but being plugged in is not proof that it will succeed. See the request failure conditions.

You do not need to find a permission pop-up that never appeared. Whether the browser prompts is browser-dependent. If this is a managed device, record that fact for support rather than assuming a site setting can override its policies.

Does it fail only after switching tabs or apps?

Return to the tool page. If the control is still enabled, turn it off, then on again; if it is already off, enable it. Run the visible-page idle test again. The current tool attempts recovery when you return in native wake-lock mode, but that attempt can fail.

Switching to another tab, minimizing the browser or opening another mobile app can hide the requesting page. The visibility rules explain why keeping a tab open is different from keeping it visible. Native screen wake locks are released when their document becomes hidden, as specified by W3C.

If the test works while the tool is visible and fails only after you leave, stop repeating that arrangement. For a recipe in another tab or work in another app, use that app's keep-awake option or the device guide below. This page cannot promise background protection.

Is the timer still running when the screen goes dark?

In the current tool, the enabled control and session timer can remain active after a browser lock is released. They are not a live measurement of display protection. A released lock needs a new request; see the wake-lock lifecycle.

Turn the tool off and on while it is visible, check for errors, and repeat the idle test. If it still fails without leaving the page, compare power conditions and another updated browser. A missing error message alone does not establish success, including when the tool uses its fallback method.

When to use a different guide

• For another app or a longer device-wide timeout, follow the iPhone, Android, Windows or Mac steps.
• If the display blanks during active typing or pointer use, start with screen going black. An idle-timeout test will not identify every display fault.
• If the picture remains visible but gets darker, use screen dimming rather than treating every brightness change as wake-lock failure.

Still stuck? Record a useful failure report

Include your device model, operating-system and browser versions, the page address, selected duration and exact error text. Note battery or plugged-in status, battery saver, the normal timeout, how long the test ran, and whether the tool stayed visible throughout.

Describe the shortest repeatable sequence, such as “works with this tab visible; fails after opening another app; returns after toggling off and on.” Send those details to support@keep-screen-on.com. Do not include passwords or other sensitive information in screenshots.