The fastest way to adjust brightness

The quickest method is the brightness slider in your system tray. Click the battery or network icon in the bottom right corner of your screen, then look for a brightness control — it usually shows as a sun icon with a slider bar underneath. Drag the slider left to dim or right to brighten. This works on most laptops and tablets running Windows 10.

If you don't see a brightness slider in the quick settings panel, your device may not have a built-in brightness sensor or the drivers may need updating. In that case, use the Settings app instead, which works on any monitor connected to Windows 10.

Key Takeaways

  • The quickest brightness adjustment is the slider in your system tray, accessed by clicking the battery or network icon in the bottom right corner.
  • If the quick settings slider is missing, open Settings, go to System, then Display, and use the brightness slider there instead.
  • Some monitors have physical brightness buttons on the monitor itself, which override Windows settings and may be faster than software controls.
  • If brightness controls are completely missing, your monitor drivers may be outdated and can be updated through Device Manager.

Using the Settings app to adjust brightness

Open the Settings app by pressing the Windows key and typing "settings," then select the Settings app from the results. Click System in the left sidebar, then select Display. You'll see a brightness slider under the heading "Brightness and color." Drag it to your preferred level.

This method works on all Windows 10 devices, whether you're using a laptop, tablet, or desktop monitor. The brightness change takes effect when ready. If you want Windows to adjust brightness automatically based on the time of day or your surroundings, look for the Night light toggle just below the brightness slider — this reduces blue light in the evenings.

Physical monitor buttons as an alternative

Many external monitors have brightness controls built into the monitor itself, usually buttons or a dial on the front or side. These physical controls often work faster than Windows settings because they don't require opening menus. Look for buttons labeled with a sun icon or marked with plus and minus symbols.

Using the monitor's physical buttons is especially useful if you share your computer with others, because the brightness setting stays with the monitor rather than the Windows account. If your monitor has these buttons, they typically override the Windows brightness setting, so adjusting one won't affect the other.

Updating monitor drivers if brightness controls are missing

If you can't find brightness controls anywhere — not in the system tray, not in Settings, and your monitor has no physical buttons — your monitor drivers may be out of date. Press the Windows key and type "device manager," then open Device Manager. Look for Monitors in the list and click the arrow next to it to expand the section.

Right-click on your monitor name and select Update driver. Choose Search automatically for updated driver software. Windows will search online for the latest drivers and install them if found. After the update completes, restart your computer and check whether the brightness controls now appear in Settings or the system tray.

If Device Manager shows no monitor listed, or if the update doesn't help, your monitor may not support software brightness control. In that case, use the physical buttons on the monitor itself if available, or contact the monitor manufacturer to confirm whether drivers exist for your model.

Brightness shortcuts using keyboard hotkeys

Many laptops have dedicated brightness keys on the keyboard, usually marked with sun symbols and located on the function row at the top. These are typically Fn + F5 to dim and Fn + F6 to brighten, though the exact keys vary by laptop brand. Check your keyboard to see which keys have sun icons printed on them.

Press and hold the Fn key, then tap the brightness key repeatedly until you reach your desired brightness level. This method is faster than opening Settings or the system tray, and it works even when your hands are full or you're in a hurry. If the keyboard shortcuts don't work, your laptop's brightness drivers may need updating using the method described above.

Adjusting brightness for specific apps or windows

Windows 10 doesn't have a built-in way to change brightness for one app while leaving others unchanged. However, you can use the Night light feature to reduce brightness and blue light across your entire screen during evening hours. Open Settings, go to System, then Display, and toggle Night light on. Click Night light settings to choose what time it turns on and off, and how strong the effect is.

If you need to dim only one window or app, your best option is to lower the overall monitor brightness using any of the methods above, or to use the app's own brightness or contrast settings if it has them. Some apps like web browsers and media players have their own brightness controls built in.

Troubleshooting brightness that won't change

If you adjust the brightness slider but nothing happens, first check whether your monitor has a physical brightness lock or power-saving mode enabled. Look at the monitor itself for any buttons or switches that might be restricting brightness changes. Some monitors have a child lock feature that prevents software from changing brightness.

If the monitor has no physical locks, try restarting your computer. Sometimes the brightness driver stops responding until you restart. If brightness still won't change after a restart, uninstall and reinstall the monitor driver: open Device Manager, right-click your monitor, select Uninstall device, then restart your computer. Windows will automatically reinstall the driver on startup.

If you're using an external monitor connected via HDMI or DisplayPort, the monitor may not support software brightness control at all. Check your monitor's manual or the manufacturer's website to confirm whether your model supports brightness adjustment through Windows. Some older or budget monitors only have physical buttons.

Frequently Asked Questions

Why is my brightness slider grayed out or missing?

A missing or grayed-out brightness slider usually means your monitor drivers are outdated or not installed. Open Device Manager, find your monitor under the Monitors section, right-click it, and select Update driver. If no monitor appears in Device Manager, your monitor may not support software brightness control and you'll need to use the physical buttons on the monitor itself.

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

Yes, use the Night light feature in Settings. Open Settings, go to System, then Display, and toggle Night light on. Click Night light settings to set a schedule — for example, you can have it turn on at sunset and off at sunrise. This reduces blue light and dims your screen automatically, though it's designed more for eye comfort than for full brightness control.

Does changing brightness in Windows affect the monitor's physical buttons?

No, they work independently. If your monitor has physical brightness buttons, adjusting brightness through Windows won't change the monitor's internal brightness setting, and vice versa. The physical buttons usually take priority, so if you adjust both, the monitor's physical setting is what you'll see on screen.

Will lowering brightness reduce eye strain?

Lowering brightness can help if your screen is brighter than your surroundings, but it's not a complete solution for eye strain. The Night light feature, which reduces blue light, may be more helpful for evening use. Other factors like screen distance, viewing angle, and how often you take breaks matter just as much as brightness.

What if my laptop brightness keys don't work?

First, make sure you're holding the Fn key while pressing the brightness key — some laptops require this. If that doesn't work, your brightness drivers may be outdated. Open Device Manager, expand Monitors, right-click your display, and select Update driver. If the keys still don't work after updating, the keyboard itself may need repair or replacement.