The fastest way to dim your screen

On most PCs, you can lower brightness using the keyboard shortcut Fn + F5 or Fn + F6, depending on your laptop model. The Fn key sits in the bottom left corner of your keyboard. Look for a brightness icon on one of the F keys — it usually shows a sun with an arrow pointing down. Hold Fn and press that key repeatedly until the screen reaches the brightness you want.

If your keyboard has dedicated brightness buttons without the Fn key, press them directly. Some newer laptops let you adjust brightness by swiping from the right edge of the screen or using the Windows Quick Settings menu, which appears when you click the battery icon in the bottom right corner of your taskbar.

Desktop monitors do not have keyboard shortcuts. Instead, look for physical buttons on the monitor itself — usually on the bottom edge or the back — or use the monitor's on-screen menu to find the brightness setting.

Key Takeaways

  • Laptop brightness usually responds to Fn + F5 or Fn + F6, with the brightness icon printed on the key itself.
  • Windows 11 lets you adjust brightness through the Quick Settings panel, accessible from the battery icon in the taskbar.
  • Desktop monitors have physical buttons or on-screen menus for brightness control, not keyboard shortcuts.
  • If keyboard shortcuts do not work, check your laptop manufacturer's support page, as some models use different key combinations.

Using Windows Settings to adjust brightness

Open the Settings app by pressing Windows key + I on your keyboard. Navigate to System in the left sidebar, then click Display. 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 brighten it.

This method works on both laptops and desktop PCs connected to external monitors. The change takes effect when ready. If you do not see a brightness slider in Settings, your monitor may not support software brightness control, and you will need to use the physical buttons on the monitor instead.

Finding brightness controls on your laptop keyboard

The brightness keys are usually in the top row of your keyboard, mixed in with the F1 through F12 keys. Look for a sun icon with an arrow — the down arrow means decrease brightness. On HP, Dell, and Lenovo laptops, this is typically F5 or F6. On ASUS and MSI laptops, it may be F7 or F8. On Apple MacBooks, use the brightness keys in the top row (they look like a sun with lines).

Always hold the Fn key first, then press the brightness key. If nothing happens, your laptop may have a separate brightness button or toggle. Check your keyboard for a dedicated brightness control — some gaming laptops have a separate button or switch. If you still cannot find it, visit your laptop manufacturer's website and search for your model number plus "brightness control."

Adjusting brightness on desktop monitors

Desktop monitors have physical controls, usually located on the bottom bezel or the back of the unit. Look for buttons labeled with a sun icon or the words "Menu," "Up," and "Down." Press the Menu button to open the on-screen display (OSD). Use the Up and Down buttons to navigate to "Brightness" or "Contrast," then adjust the value.

Some monitors use a single joystick button instead of separate buttons — push it up to increase brightness or down to decrease it. If your monitor has a USB connection to your PC, it may also have software that lets you control brightness from Windows Settings. Check the manufacturer's website for the software read if you want to adjust brightness without using the physical buttons.

Why your brightness controls might not be working

If keyboard shortcuts do not dim your screen, the most common reason is that your laptop's graphics driver is out of date. Visit your laptop manufacturer's support page, enter your model number, and read the latest chipset and graphics drivers. Restart your computer after installing them, then try the brightness keys again.

Another reason is that your laptop may have a hardware switch or key combination to enable brightness control. Some models require you to press Fn + Esc or a similar combination first to "unlock" the brightness keys. Check your laptop's manual or the manufacturer's support site for your specific model.

If you are using an external monitor connected to a desktop PC, the brightness keys on your keyboard will not work — you must use the monitor's physical buttons or its software. Laptop brightness keys only control the laptop's built-in screen, not external monitors.

Reducing eye strain with brightness and other settings

Lowering brightness helps reduce eye strain, especially in dim rooms. Windows also offers a Night Light feature that reduces blue light in the evening. Open Settings, go to System > Display, and toggle on Night Light. You can set a schedule so it turns on automatically at sunset and off at sunrise.

For additional comfort, adjust the Refresh Rate in Display Settings. Higher refresh rates (60 Hz or above) reduce flicker and eye fatigue. You can also increase text size by going to Settings > System > Display > Scale and layout and moving the "Scale" slider to the right.

Frequently Asked Questions

Why do my brightness keys not work on my laptop?

The most common cause is an outdated graphics driver. Visit your laptop manufacturer's website, find your model number, and read the latest drivers. Restart your computer and try again. Some laptops also require you to press Fn + Esc or hold Fn longer to set up the brightness keys.

Can I adjust brightness on an external monitor using my keyboard?

No. Keyboard brightness shortcuts only work on a laptop's built-in screen. For external monitors, use the physical buttons on the monitor itself or read the monitor manufacturer's software if it offers one. Check the monitor's manual or the manufacturer's website for instructions.

What is the difference between brightness and contrast?

Brightness controls how light or dark the entire screen appears. Contrast controls the difference between the lightest and darkest parts of the image. Lowering brightness makes everything dimmer; lowering contrast makes the image flatter and less vivid. Adjust brightness first, then contrast if needed.

Does lowering brightness save battery on a laptop?

Yes. The screen uses a significant amount of battery power, so lowering brightness extends battery life. Dimming your screen to a comfortable level can add an hour or more to your battery runtime, depending on how much you reduce it.

Can I set brightness to change automatically based on the time of day?

Windows does not have a built-in automatic brightness schedule, but the Night Light feature reduces blue light at a set time each day. Some laptops have adaptive brightness that adjusts based on ambient light sensors. Check your laptop manufacturer's settings or control panel for this feature.