The quickest way to adjust brightness

The fastest method is the brightness slider built into Windows 10's Quick Settings panel. Press Windows key + A on your keyboard, and a panel will open on the right side of your screen. You'll see a brightness slider near the top—drag it left to dim the screen or right to brighten it. The change takes effect when ready.

If you don't see the brightness slider in Quick Settings, your keyboard or laptop may not support this feature. Some desktop monitors and older laptops lack the hardware connection needed to adjust brightness through Windows. In that case, you'll need to use your monitor's physical buttons instead, or try one of the other methods below.

Key Takeaways

  • Press Windows key + A to open Quick Settings and use the brightness slider for when ready adjustment.
  • If Quick Settings doesn't show brightness, check your display settings or use your monitor's physical buttons.
  • Adaptive brightness automatically dims your screen in low light and brightens it in bright conditions if you turn it on.
  • Battery Saver mode reduces brightness along with other power settings to extend laptop battery life.
  • Some laptops have dedicated brightness keys on the keyboard—usually marked with sun symbols and requiring the Fn key.

Using the Settings app for more control

If the Quick Settings slider doesn't appear or you want more detailed options, open the Settings app by pressing Windows key + I. Navigate to System in the left menu, then click Display. Under the "Brightness and color" section, you'll see a brightness slider you can adjust the same way as Quick Settings.

This method also shows you whether Adaptive brightness is turned on. Adaptive brightness uses your screen's light sensor to automatically adjust brightness based on your surroundings—it dims the screen when you're in a dark room and brightens it when you're in sunlight. You can toggle this on or off depending on your preference. Some people find it helpful; others prefer to control brightness manually.

Keyboard shortcuts for laptops with brightness keys

Many laptops have dedicated brightness keys on the keyboard, usually marked with sun symbols. These are typically located on the function row (F1 through F12). To use them, hold down the Fn key and press the brightness key—the one with the dimmer sun icon lowers brightness, and the one with the brighter sun icon raises it.

The exact keys vary by laptop manufacturer. On Dell and HP laptops, brightness keys are often F11 and F12. On Lenovo, they're frequently F11 and F12 as well, but some models use different keys. Check your laptop's manual or look at the symbols printed on your function keys to identify which ones control brightness. These keyboard shortcuts work regardless of which app you have open.

Adjusting brightness through your monitor's buttons

If you're using a desktop monitor or an external display connected to your laptop, the monitor itself has physical buttons to control brightness. These buttons are usually located on the bottom or side of the monitor bezel. Press the menu button (often marked with three horizontal lines) to open the on-screen display, then use the arrow buttons to navigate to brightness and adjust it.

The exact button layout depends on your monitor model—some have a single joystick button instead of separate arrow buttons. If you're unsure which button does what, consult your monitor's manual or look for a label printed on the bezel. Adjusting brightness this way only affects that specific monitor and doesn't change Windows settings.

Turning on Battery Saver to reduce brightness

If you're using a laptop and want to extend battery life, Battery Saver mode automatically reduces brightness along with other power settings. To turn it on, press Windows key + A to open Quick Settings, then click the Battery Saver tile. When Battery Saver is active, your screen will dim noticeably, but you can still manually adjust brightness using the slider even while it's on.

Battery Saver activates automatically when your battery drops to a certain level (usually around 20 percent), but you can turn it on manually at any time. It reduces processor speed and limits background activity in addition to dimming the screen, so your laptop will use less power overall. You can turn Battery Saver off whenever you need full brightness and performance again.

What to do if brightness controls don't work

If you've tried the Quick Settings slider and the Settings app but brightness won't change, the problem is usually a missing or outdated display driver. A driver is software that lets Windows communicate with your monitor or laptop screen. To update it, right-click the Start button and select Device Manager. Expand the Monitors or Display adapters section, right-click your display, and select Update driver.

Choose Search automatically for updated driver software, and Windows will search for the latest version. If an update is found, install it and restart your computer. If brightness still doesn't work after updating, your monitor or laptop may not support brightness adjustment through Windows—in that case, use your monitor's physical buttons or your laptop's brightness keys instead. You can also contact the manufacturer's support team for help troubleshooting.

Frequently Asked Questions

Why doesn't the brightness slider appear in Quick Settings?

Your display hardware may not support brightness adjustment through Windows, or the display driver may be outdated or missing. Desktop monitors especially often require you to use their physical buttons instead. Try updating your display driver through Device Manager, or check whether your monitor has manual brightness controls on its bezel.

Can I set brightness to change automatically at certain times of day?

Windows 10 doesn't have a built-in scheduler for brightness, but you can turn on Adaptive brightness to let your screen adjust based on light in the room. Some laptops from manufacturers like Dell or Lenovo include their own software that can schedule brightness changes—check your laptop's control panel or system tray for a display or power management app.

Does lowering brightness actually save battery on a laptop?

Yes, dimming the screen reduces power consumption and extends battery life, though the effect is modest compared to other power-saving measures. The display is one of the largest power drains on a laptop, so even a small brightness reduction helps. Battery Saver mode combines brightness reduction with other settings for a more significant battery boost.

What if my laptop has brightness keys but they don't work?

The keyboard driver may be outdated, or the brightness keys may be disabled in your BIOS settings. Try updating your keyboard driver through Device Manager the same way you would update a display driver. If that doesn't work, restart your computer and enter BIOS (usually by pressing F2, F10, or Delete during startup) to check whether brightness control is enabled.

Can I use an external monitor with a laptop and adjust both screens separately?

Yes. Use the Quick Settings slider or Settings app to adjust your laptop screen, and use your external monitor's physical buttons to adjust that display independently. Each screen has its own brightness setting, so you can set them to different levels depending on your needs.