The fastest way to change brightness

On most Windows 10 laptops and tablets, you can adjust brightness using the keyboard shortcut Fn + F5 to dim the screen or Fn + F6 to brighten it. The exact keys vary by manufacturer — some use F11 and F12, or show a sun icon on the key itself. Look at your keyboard for brightness symbols (usually a sun with fewer or more rays) to find the right keys.

Each time you press the combination, a brightness slider appears on your screen for a few seconds, showing you how much brighter or dimmer the display is becoming. Keep pressing until you reach the level you want. This method works whether you are using battery power or plugged in.

If the Fn key combinations do not work, your keyboard driver may need updating, or your laptop manufacturer may use different keys. Move to the Settings method below, which works on every Windows 10 machine.

Key Takeaways

  • Keyboard shortcuts using Fn plus a function key (usually F5 or F6) are the quickest way to change brightness on most Windows 10 laptops.
  • The Settings app lets you adjust brightness on any Windows 10 device, including desktops with external monitors, by opening Settings, selecting System, then Display.
  • The Action Center quick settings panel in the bottom right corner of your screen offers a brightness slider if you prefer a visual control.
  • If keyboard shortcuts do not work, check Device Manager to see whether your display driver needs updating.

Changing brightness through Windows Settings

Open the Settings app by pressing Windows key + I on your keyboard. Click System in the left sidebar, then select Display from the menu that appears.

Under the "Brightness and color" section, you will see a slider labeled Brightness. Drag it to the left to dim your screen or to the right to make it brighter. The change takes effect when ready. This method works on desktops with external monitors, laptops, and tablets — any Windows 10 device with a display.

If you do not see a brightness slider in Settings, your monitor may not support brightness adjustment through software. External monitors connected by HDMI or DisplayPort sometimes require physical buttons on the monitor itself to change brightness.

Using the Action Center quick settings

Press Windows key + A to open the Action Center panel in the bottom right corner of your screen. You will see a brightness slider near the top of the panel, usually labeled with a sun icon.

Drag the slider left or right to adjust brightness, or click the sun icon itself to cycle through preset brightness levels. This is faster than opening Settings if you only need to make a quick adjustment. Close the Action Center by clicking elsewhere on your screen or pressing the Windows key again.

When brightness controls do not respond

If your keyboard shortcuts are not working, your display driver may be outdated or missing. Right-click the Start button and select Device Manager. Look for Display adapters in the list and click the arrow next to it to expand the section.

Right-click the display adapter listed there and select Update driver. Choose Search automatically for updated driver software and let Windows search for the latest version. Restart your computer after the update completes, then test your brightness keys again.

If Device Manager shows a yellow warning triangle next to your display adapter, the driver is definitely corrupted. Updating it should resolve the problem. If no driver update is found, visit your laptop manufacturer's support website and read the display driver directly for your specific model.

Brightness settings for different power modes

Windows 10 lets you set different brightness levels depending on whether you are plugged in or running on battery. This helps extend battery life on laptops. Open Settings, go to System, then Battery saver.

Under "Battery saver settings," you can turn on Lower screen brightness while in battery saver mode. When this is enabled, your screen automatically dims when battery power drops to a certain level. You can still manually adjust brightness at any time using the methods above — the automatic dimming just sets a lower starting point.

To set different brightness levels for plugged-in versus battery use, go back to Display settings and look for Brightness under "Brightness and color." The slider you see there applies to your current power state. Plug in your laptop, adjust brightness to your preferred plugged-in level, then unplug it and adjust to your preferred battery level separately.

Brightness and blue light filters

Windows 10 includes a Night light feature that reduces blue light in the evening, which some people find easier on the eyes. This is separate from brightness adjustment. Open Settings, go to System, then Display, and toggle Night light on or off.

Night light makes your screen appear warmer (more orange or yellow) rather than brighter or dimmer. You can use it together with brightness adjustment — lower brightness with Night light on creates a very dim, warm display suitable for evening use. Adjust the Strength slider under Night light to control how much orange tint appears.

Troubleshooting brightness on external monitors

If you are using an external monitor connected to a Windows 10 desktop or laptop, brightness adjustment through Settings may not work. Most external monitors have physical buttons on the front or side that control brightness directly. Look for buttons labeled with a sun icon or a plus and minus symbol.

Press and hold the menu button (usually in the center of the button cluster) until an on-screen menu appears on your monitor. Navigate to "Brightness" or "Luminance" using the arrow buttons, then use plus and minus to adjust. The exact steps vary by monitor brand, so check your monitor's manual if the buttons are not clearly labeled.

Some newer monitors support brightness adjustment through USB or DisplayPort, but this requires special software from the monitor manufacturer. Check the manufacturer's website to see whether your monitor model supports software brightness control.

Frequently Asked Questions

Why do my brightness keys not work on Windows 10?

The most common reason is an outdated or missing display driver. Open Device Manager, find your display adapter, right-click it, and select "Update driver." If that does not help, your laptop manufacturer may use custom brightness software that needs to be installed separately — check their support website for your specific model.

Can I set brightness to turn on automatically at certain times?

Windows 10 does not have a built-in scheduler for brightness, but you can use the Night light feature to automatically reduce blue light at sunset. Open Settings, go to Display, toggle Night light on, and set a schedule. For more advanced automation, you would need third-party software.

Does lowering brightness save battery on a laptop?

Yes, reducing screen brightness is one of the most effective ways to extend battery life on a laptop. The display uses significant power, so dimming it can add several hours of use. Windows 10's battery saver mode can automatically lower brightness when power is low.

What if my monitor has no brightness button?

Some older or budget monitors do not have brightness controls. In that case, you can only adjust brightness through Windows Settings if the monitor supports it via USB or DisplayPort. Otherwise, you may need to replace the monitor or use a monitor arm with built-in brightness adjustment.

Is there a keyboard shortcut to open brightness settings directly?

No single shortcut opens brightness settings directly, but Windows key + A opens the Action Center with a brightness slider, which is the fastest method after keyboard brightness keys. From there, you can adjust without opening the full Settings app.