The quickest way to dim your monitor

Most monitors have physical buttons on the front or side that control brightness directly. Look for a button labeled with a sun icon, a plus and minus symbol, or the word "Menu." Press and hold the minus button (or the left arrow if your monitor uses directional controls) until the screen reaches the brightness level you want. This method works on any monitor, regardless of what computer you're using.

If your monitor doesn't have visible buttons, check the back or underside — some models hide controls there. A few older or budget monitors lack brightness controls entirely, in which case you'll need to adjust brightness through your operating system instead.

The physical buttons on your monitor are usually the fastest option because they work when ready and don't depend on your computer's software or drivers.

Key Takeaways

  • Most monitors have physical brightness buttons on the front or side that you can use to dim the screen without touching your computer.
  • Windows, macOS, and Linux all have built-in brightness controls in their display settings if your monitor lacks physical buttons.
  • Lowering brightness reduces eye strain during long work sessions and can extend your monitor's lifespan slightly.
  • If you use your monitor with a laptop, you may be able to adjust brightness using your keyboard's brightness keys instead of the monitor itself.

Adjusting brightness through Windows settings

Open the Settings app by pressing Windows key + I, then go to System and select Display. You'll see a brightness slider near the top of the window. Drag it to the left to dim your screen or to the right to brighten it. The change takes effect when ready.

If you don't see a brightness slider, your graphics driver may not support software brightness control. This is common on desktop computers with separate graphics cards. In that case, use your monitor's physical buttons instead.

You can also adjust brightness quickly from the Quick Settings menu. Press Windows key + A to open it, then look for the brightness slider at the bottom of the panel.

Adjusting brightness on macOS

Click the Apple menu in the top-left corner and select System Settings. Go to Displays, then use the Brightness slider to dim or brighten your screen. The slider appears on the main Displays page, and changes happen right away.

If you're using a MacBook, you can also press the brightness keys on your keyboard — usually the F1 and F2 keys, or the keys with sun symbols on them. These work whether you're connected to an external monitor or using the built-in display.

Some third-party monitors connected to a Mac may not respond to software brightness controls. If that's the case, use the physical buttons on the monitor itself.

Adjusting brightness on Linux

The exact steps depend on which Linux desktop environment you're using. On GNOME (the most common), click the system menu in the top-right corner, then select Settings. Go to Displays and adjust the Brightness slider.

On KDE Plasma, right-click the desktop and select Display Settings, then look for the brightness control. On other desktop environments, the path may differ, but the Displays or Monitor settings section is usually where brightness lives.

If you can't find a brightness slider in your settings, you may need to install a brightness control tool. Many Linux users install brightnessctl or xbacklight through their package manager to control brightness from the command line or a graphical tool.

Why you might want to lower brightness

Lowering your monitor's brightness reduces the amount of light entering your eyes, which can ease strain during long work sessions. This is especially helpful in dim rooms or at night, where a bright monitor creates a harsh contrast with your surroundings.

Lower brightness also means your monitor uses slightly less power, which can extend its lifespan marginally. Monitors that run at full brightness continuously tend to degrade faster than those run at moderate levels, though the difference is usually small over a monitor's typical 5 to 10 year lifespan.

Many people find that matching their monitor brightness to their room's ambient light — brighter during the day, dimmer at night — makes the screen easier to look at for hours without fatigue.

Finding the right brightness level for your space

There's no single "correct" brightness setting because it depends on how much light is in your room. A good starting point is to set your monitor's brightness so that it doesn't look noticeably brighter or dimmer than the objects around it. If you're working in a bright office, you may need 70 to 100 percent brightness. In a dim room or at night, 30 to 50 percent is often more comfortable.

If you find yourself squinting or leaning closer to the screen, your brightness is probably too low. If your eyes feel tired or strained after an hour of work, try lowering it slightly — sometimes the problem is brightness, and sometimes it's glare or contrast settings instead.

Many modern monitors also have a blue light filter or eye comfort mode that reduces blue light in addition to lowering brightness. These settings can help reduce eye strain during evening work, though lowering brightness alone usually helps most people.

Brightness controls on laptops and tablets

If you're using a laptop, your keyboard usually has dedicated brightness keys. Look for keys with sun symbols, often in the F-key row. Press the key with the dimmer sun to lower brightness, or the brighter sun to increase it. These keys control your laptop's built-in display, not an external monitor.

If you've connected an external monitor to your laptop, the keyboard brightness keys won't affect it — you'll need to use either the monitor's physical buttons or your operating system's display settings. Some external monitors also respond to brightness commands sent through USB, though this is less common.

On tablets like iPads, swipe down from the top-right corner to open Control Center, then drag the brightness slider to dim the screen. Android tablets vary by manufacturer, but the brightness control is usually in the Quick Settings panel you access by swiping down from the top.

Frequently Asked Questions

Will lowering brightness damage my monitor?

No. Running a monitor at lower brightness is actually gentler on the hardware and may extend its lifespan slightly. Monitors are designed to operate across a full range of brightness levels, and lower brightness means less heat and less stress on the backlight.

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

Yes. Windows 10 and 11 have an automatic brightness feature that adjusts based on ambient light if your monitor or laptop supports it. On macOS, go to System Settings > Displays and enable "Automatically adjust brightness." On Linux, this depends on your desktop environment, but GNOME has a similar option in Displays settings.

Why doesn't my monitor have brightness buttons?

Some budget monitors and older models lack physical controls to reduce cost and complexity. If yours doesn't have buttons, you can adjust brightness through your operating system's display settings instead. A few very old monitors have no brightness control at all, in which case you're limited to what the monitor shipped with.

Is there a difference between monitor brightness and screen brightness on my laptop?

Yes. Your laptop's keyboard brightness keys control the built-in display. If you connect an external monitor, those keys won't affect it — you'll use the monitor's physical buttons or your operating system's settings instead. Some laptops let you control both separately.

Does lowering brightness help with blue light at night?

Lowering brightness helps reduce overall light output, which can ease eye strain. A dedicated blue light filter or night mode is more effective at reducing blue light specifically, but many people find that lowering brightness alone makes evening screen time more comfortable.