The quickest way to adjust brightness on Windows 10

The fastest method depends on your hardware. If your keyboard has brightness keys—usually marked with a sun icon and located on the function row—press Fn plus the brightness key to raise or lower the screen. On most laptops, this works when ready without opening any menus.

If your keyboard doesn't have dedicated brightness keys, or if you prefer using the settings menu, open the Action Center by pressing Windows key + A. Look for the brightness slider near the top of the panel. Click and drag it left to dim or right to brighten. This slider appears on most Windows 10 machines, though some older or budget laptops may not have it.

For desktop monitors without brightness controls built into Windows, you'll need to use the physical buttons on the monitor itself, usually located on the bottom or side bezel. These buttons vary by manufacturer, so check your monitor's manual if you're unsure which one controls brightness.

Key Takeaways

  • Laptop keyboards with brightness keys (marked with a sun icon) let you adjust brightness when ready by pressing Fn plus that key.
  • The Action Center brightness slider, opened with Windows key + A, works on most laptops and some desktops with compatible hardware.
  • Desktop monitors use physical buttons on the monitor itself, not Windows settings, to change brightness.
  • If the Action Center slider doesn't appear, your monitor may not support brightness control through Windows.
  • Updating your graphics driver can restore a missing brightness slider if it worked before.

Using the Settings menu for brightness control

If you prefer a more detailed approach, you can reach brightness settings through the main Settings app. Press Windows key + I to open Settings, then select System from the left menu.

Click Display in the left sidebar. Scroll down until you see the brightness slider under "Brightness and color." Drag the slider to your preferred level. This method takes longer than the Action Center but gives you access to related display settings like color temperature and night light mode in the same location.

Why the brightness slider might be missing

Some Windows 10 machines don't show a brightness slider in the Action Center or Settings, even though the hardware supports it. This usually means your graphics driver needs an update or your monitor isn't recognized by Windows as supporting brightness control.

To update your graphics driver, press Windows key + X and select Device Manager. Expand the "Display adapters" section, right-click your graphics card, and select Update driver. Choose "Search automatically for updated driver software" and let Windows find and install the latest version. Restart your computer afterward.

If updating the driver doesn't restore the slider, your monitor may straightforward not support brightness control through Windows. In that case, use the physical buttons on your monitor or check whether your laptop manufacturer included a custom brightness app in the system tray.

Using Night Light to reduce eye strain

Windows 10 includes a Night Light feature that shifts your screen toward warmer colors in the evening, which can reduce eye strain. This is different from brightness but often works alongside it. Open Settings with Windows key + I, go to System > Display, and toggle Night Light on.

Click Night Light settings to set a schedule—for example, to turn on automatically at sunset and off at sunrise. You can also adjust the color temperature slider to make the screen warmer or cooler. Night Light doesn't replace brightness adjustment; use both together for comfortable viewing at different times of day.

Brightness control on external monitors

If you're using a desktop computer with an external monitor, Windows brightness settings won't work because the monitor is a separate device. Instead, look for physical buttons on the monitor's bezel, usually near the power button. These buttons typically control brightness, contrast, and input selection.

Press the menu or settings button (often marked with a gear icon or three horizontal lines) to open the monitor's on-screen display. Navigate to brightness or backlight settings using the arrow buttons, then adjust with the plus or minus button. The exact process varies by manufacturer—Dell, LG, ASUS, and others use slightly different menu layouts.

If your monitor is very old or lacks physical controls, it may not have brightness adjustment at all. In that case, the only option is to adjust Windows display settings or use Night Light to make the screen easier on your eyes.

Troubleshooting brightness that won't change

If you adjust the brightness slider but the screen doesn't get brighter or dimmer, first check whether your monitor is set to a fixed brightness level. Some monitors have a "lock" feature that prevents brightness changes from the computer. Look for a lock icon in the monitor's on-screen menu and disable it if present.

Next, verify that your graphics driver is up to date by returning to Device Manager (Windows key + X, then Device Manager) and checking for driver updates. If an update is available, install it and restart.

If the slider still doesn't work after a driver update, your monitor may not support brightness control through Windows at all. This is common on older or budget monitors. You can still adjust brightness using the physical buttons on the monitor itself, or use Night Light to reduce screen intensity without changing the actual brightness setting.

Frequently Asked Questions

Why does my brightness slider disappear sometimes?

The brightness slider can disappear temporarily if your graphics driver crashes or if Windows loses connection to your monitor. Restarting your computer usually brings it back. If it stays gone, update your graphics driver through Device Manager.

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

Windows 10 doesn't have a built-in brightness schedule, but Night Light can shift colors automatically on a schedule. For automatic brightness changes based on time, you'd need third-party software or a monitor with its own scheduling feature.

Does lowering brightness save battery on a laptop?

Yes. The screen is one of the largest power consumers on a laptop. Lowering brightness can extend battery life by 30 minutes to an hour, depending on how much you reduce it and what you're doing.

What if my monitor has no buttons and no Windows brightness control?

Some monitors, especially older ones, don't support brightness adjustment at all. In that case, use Night Light to warm the colors and reduce eye strain, or adjust the brightness of your graphics card's control panel if your manufacturer provides one.

Is there a keyboard shortcut to quickly max out brightness?

No universal shortcut exists across all Windows 10 machines. Your best option is the Fn + brightness key combination on laptops, or the Action Center slider (Windows key + A) on any machine. Some manufacturers include custom shortcuts in their control software.