The fastest way to brighten your screen

On most computers, you can raise the brightness in seconds using your keyboard. Look for keys with a sun symbol or brightness icon — usually on the top row of your keyboard. Press and hold the key marked with an upward arrow or plus sign until your screen reaches the brightness you want. On Windows laptops, this is often the F11 or F12 key. On Mac laptops, use the brightness keys on the top row (they look like a sun with lines).

If your keyboard doesn't have brightness keys, or if you want finer control, you can adjust brightness through your operating system's settings. This method works the same way every time and lets you set an exact level rather than guessing.

Key Takeaways

  • Brightness keys on your keyboard (usually marked with a sun symbol) are the quickest way to adjust screen brightness on laptops.
  • Windows computers let you change brightness through Settings > System > Display, where you can drag a slider to your preferred level.
  • Mac computers have brightness controls in System Settings > Displays, or you can use the brightness keys at the top of the keyboard.
  • If you have an external monitor, it may have physical buttons on the back or bottom that control brightness separately from your computer.
  • Lowering brightness when you're in a dark room reduces eye strain and saves battery power on laptops.

Adjusting brightness on Windows 10 and Windows 11

Open the Settings app by pressing the Windows key and typing "Settings," then press Enter. Click on System in the left menu, then select Display. You'll see a slider labeled "Brightness and color" near the top of the screen. Drag the slider to the right to increase brightness or to the left to decrease it. The change happens when ready as you move the slider.

If you don't see a brightness slider, your computer may not have a built-in brightness sensor or your graphics driver needs updating. In that case, the keyboard method is your best option. Some Windows laptops also let you adjust brightness from the Quick Settings panel — press Windows key + A to open it, and look for a brightness slider there.

Adjusting brightness on Mac computers

Press the brightness keys on your keyboard — they're in the top row and show a sun symbol. The left key decreases brightness, and the right key increases it. Hold the key down until you reach your preferred level. This is the fastest method on any Mac.

If you want to use the settings menu instead, click the Apple menu in the top left corner and select System Settings. Click Displays in the sidebar. You'll see a brightness slider — drag it to adjust. On newer Macs with the M1 chip or later, you may also see an "Auto-brightness" toggle that lets your Mac adjust brightness based on the light in your room.

Controlling brightness on an external monitor

If you're using a separate monitor plugged into your computer, the brightness controls are usually on the monitor itself, not in your computer's settings. Look for physical buttons on the bottom or back edge of the monitor. These buttons often have symbols showing brightness or a menu icon. Press the button that looks like a sun or brightness icon, then use the arrow buttons to increase or decrease brightness.

Some newer monitors have on-screen menus that appear when you press the buttons. If you see a menu pop up on your screen, look for an option labeled "Brightness" or "Luminance" and adjust it using the arrow buttons. The exact steps depend on your monitor's brand and model, so check the manual if you're unsure which buttons to use.

Why your brightness might not be changing

If you've adjusted the brightness slider but nothing happens, your graphics driver may be outdated. On Windows, right-click the Start menu and select Device Manager. Find Display adapters, right-click it, and select Update driver. Let Windows search for the latest version and install it, then restart your computer.

On a Mac, brightness controls usually work without driver updates, but if they don't, restart your computer first. If the problem continues, check System Settings > Displays again to make sure Auto-brightness isn't overriding your manual adjustment. You can toggle it off if it's causing problems.

Brightness settings that reduce eye strain

The ideal brightness depends on your room's lighting. In a bright room, you may need your screen at 70 to 100 percent brightness. In a dim room, 30 to 50 percent is usually more comfortable and causes less eye strain. If you work at night, consider lowering brightness even more and enabling Night Light (Windows) or Night Shift (Mac), which reduces blue light from your screen.

To turn on Night Light in Windows, go to Settings > System > Display and toggle on Night Light. On Mac, open System Settings > Displays and click the Color tab, then adjust the color temperature slider. These features warm up your screen's color, which many people find easier on the eyes during evening hours.

Frequently Asked Questions

Why is my brightness stuck at maximum or minimum?

This usually means your graphics driver is outdated or your monitor's brightness sensor isn't working. Try updating your graphics driver through Device Manager on Windows, or restart your Mac. If the problem continues on an external monitor, the monitor's buttons may be locked — check the manual for an unlock sequence, usually holding a button for several seconds.

Can I set different brightness levels for different times of day?

Yes. On Windows 11, you can use the Focus information feature to automatically lower brightness during certain hours. On Mac, enable Night Shift in System Settings > Displays and set a schedule. Both systems also let you create custom profiles if you use multiple monitors with different brightness needs.

Does lowering brightness actually save battery on a laptop?

Yes, significantly. The screen is one of the biggest power drains on a laptop. Lowering brightness from 100 to 50 percent can extend battery life by one to two hours, depending on your laptop model and what else you're running.

What if my keyboard brightness keys don't work?

Check that you're holding the key long enough — brightness usually changes gradually rather than in one step. If nothing happens after several seconds, your keyboard driver may need updating. On Windows, go to Device Manager > Keyboards, right-click your keyboard, and select Update driver. On Mac, restart your computer and try again.