Where to Find Brightness Controls in Windows

Windows gives you two main places to adjust brightness: the Settings app and the Quick Settings panel. The Quick Settings panel is faster if you need a quick change. The Settings app gives you more control and lets you set different brightness levels for battery power versus plugged-in power.

On a laptop or tablet, you can also use physical brightness keys on your keyboard — usually marked with a sun icon and located on the F-keys. On a desktop monitor, brightness controls are typically buttons or a dial on the monitor itself, not in Windows.

Key Takeaways

  • The Quick Settings panel (bottom right of your screen) is the fastest way to change brightness — swipe up from the bottom or click the icon in the system tray.
  • The Settings app lets you adjust brightness and also turn on adaptive brightness, which automatically changes brightness based on the time of day or what you are doing.
  • Laptop brightness keys (usually F1 through F12 with a sun symbol) work when ready without opening any menu.
  • Desktop monitors have physical buttons or dials on the monitor itself — Windows brightness settings do not control those.
  • If brightness controls are missing or greyed out, your graphics driver may need an update or your monitor may not support software brightness control.

Using Quick Settings for Fast Brightness Changes

The quickest way to change brightness is through the Quick Settings panel. On Windows 11, swipe up from the bottom right corner of your screen or click the battery and network icon in the system tray (bottom right). A panel will slide open showing brightness as a slider.

Drag the brightness slider left to dim the screen or right to brighten it. The change happens when ready. This method works on any Windows 11 device with a display that supports software brightness control. If you do not see a brightness slider, your monitor may only have physical controls, or your graphics driver needs updating.

Adjusting Brightness in Settings

For more detailed control, open the Settings app by pressing Windows key + I on your keyboard. Click System in the left menu, then click Display. Under the "Brightness and color" section, you will see a brightness slider.

In this same menu, you can turn on Adaptive brightness, which automatically adjusts your screen brightness based on the ambient light in your room and the time of day. This feature reduces eye strain and saves battery power on laptops. You can also set different brightness levels for when your laptop is plugged in versus running on battery — scroll down to find "Brightness" under the battery settings section.

Using Keyboard Brightness Keys on Laptops

Most laptops have dedicated brightness keys on the keyboard, usually on the F-keys (F1 through F12). Look for keys marked with a sun symbol — one with lines pointing outward (brighter) and one with fewer lines (dimmer). Press the dimmer key to reduce brightness or the brighter key to increase it.

These keys work when ready without opening any menu or app. If the brightness does not change when you press them, your keyboard driver may need updating, or the function keys may be locked behind an Fn key. Try holding Fn + the brightness key together. If that works, you can usually toggle this behavior in your laptop manufacturer's control software.

Controlling Desktop Monitor Brightness

Desktop monitors have their own brightness controls built into the hardware. Look for physical buttons, a dial, or a joystick on the monitor's bezel (the frame around the screen). Some monitors hide these controls on the back or side. Press or turn these controls to adjust brightness directly on the monitor.

Windows brightness settings do not control desktop monitors — they only work on laptop screens and tablets. If your monitor has an on-screen menu (usually accessed by pressing a button labeled "Menu"), you can also adjust brightness there. Check your monitor's manual if you cannot find the controls, as placement varies widely by brand and model.

Turning On Night Light to Reduce Eye Strain

Windows includes a feature called Night Light that reduces blue light from your screen, which can help reduce eye strain in dim lighting or before bed. Open Settings with Windows key + I, go to System > Display, and scroll down to find "Night Light."

Click the toggle to turn it on. You can set a schedule so Night Light turns on automatically at sunset and off at sunrise, or you can turn it on manually whenever you want. You can also adjust the strength of the effect by clicking "Night Light settings" — a stronger setting adds more orange tint to your screen. Night Light works alongside brightness adjustment, so you can dim your screen and enable Night Light at the same time.

What to Do If Brightness Controls Are Missing or Greyed Out

If you cannot find brightness controls or they are greyed out, the most common cause is an outdated or missing graphics driver. Your graphics driver is the software that lets Windows communicate with your display hardware. To update it, right-click the Start button and select Device Manager. Find Display adapters, right-click your graphics card (usually Intel, AMD, or NVIDIA), and click Update driver. Choose "Search automatically for updated driver software" and let Windows install any available updates.

After updating, restart your computer and check whether brightness controls appear. If they still do not work, your monitor may not support software brightness control — this is common with older desktop monitors or budget models. In that case, use the physical buttons on the monitor itself. If you are using an external monitor with a laptop, the laptop's brightness keys will only control the laptop screen, not the external monitor.

Frequently Asked Questions

Why does my brightness keep changing on its own?

Adaptive brightness is likely turned on. Open Settings > System > Display and scroll down to find "Adaptive brightness" — toggle it off if you do not want automatic changes. If it is already off, your monitor may have a built-in light sensor that is adjusting brightness based on the room's lighting.

Can I set different brightness levels for different apps?

Windows does not have a built-in feature to set per-app brightness. However, you can use Night Light to reduce blue light for specific times of day, or you can manually adjust brightness when you switch between tasks. Some third-party apps offer per-app brightness control, but they require additional software installation.

My external monitor brightness will not change from Windows settings — why?

External desktop monitors typically do not respond to Windows brightness controls. Use the physical buttons or dial on the monitor itself. If your monitor has a USB connection or DisplayPort with USB-C, it may support software control — check your monitor's manual or the manufacturer's website for a control app.

Does lowering brightness save battery on my laptop?

Yes. The display is one of the largest power consumers on a laptop. Lowering brightness, especially combined with adaptive brightness, can noticeably extend battery life. Turning on Night Light does not significantly affect battery life.

What is the difference between brightness and contrast?

Brightness controls how light or dark the entire screen is. Contrast controls the difference between the lightest and darkest parts of the image. Windows brightness settings only adjust brightness. To change contrast, use the physical controls on your monitor or look for advanced display settings in your graphics card's control panel.