Adjust brightness through your operating system settings

The fastest way to brighten your screen is through your computer's built-in brightness control. On Windows, open Settings by pressing the Windows key and typing "brightness". Click "Brightness and color" in the results. You will see a slider labeled "Brightness" — drag it to the right to increase brightness, or use the numbered scale (usually 0 to 100) to set an exact level.

On Mac, click the Apple menu in the top-left corner, select "System Settings", then click "Displays". You will see a "Brightness" slider — drag it right to brighten the screen. Both systems also let you adjust brightness from your keyboard: on Windows, look for brightness keys (usually marked with a sun icon) on your function row and press them; on Mac, press F1 to dim or F2 to brighten.

Key Takeaways

  • Windows brightness is controlled through Settings > Brightness and color, or by pressing the brightness keys on your keyboard (usually marked with a sun symbol).
  • Mac brightness is adjusted through System Settings > Displays, or by pressing F2 to brighten and F1 to dim.
  • If your screen still looks dim after raising the brightness slider, your monitor itself may have a separate brightness dial or button on its frame.
  • Increasing brightness uses more battery power on laptops, so you may want to lower it again when running on battery.
  • If brightness controls are grayed out or missing, your graphics driver may need updating through Device Manager (Windows) or Software Update (Mac).

Check your monitor's physical brightness control

Many desktop monitors have their own brightness dial or button separate from your computer's software settings. Look at the bottom or side of your monitor frame for buttons or a dial — these are often labeled with a sun icon or a plus and minus symbol. Press the plus button or turn the dial clockwise to increase brightness. This control overrides your computer's software setting, so if your screen is still dim after raising the software brightness, check your monitor's physical controls first.

If you cannot find the buttons, consult your monitor's manual or search the model number online. Some monitors hide brightness controls behind a menu button that opens an on-screen display — usually a single button labeled "Menu" or "OK" on the monitor's frame.

Update your graphics driver

If your brightness slider is grayed out or missing from your settings, your graphics driver may be outdated or corrupted. On Windows, right-click the Start button, select "Device Manager", and expand "Display adapters". Right-click your graphics card (usually labeled Intel, NVIDIA, or AMD) and select "Update driver". Choose "Search automatically for updated driver software" and let Windows search for the latest version.

On Mac, click the Apple menu, select "System Settings", then click "General" and "Software Update". Mac updates graphics drivers as part of the system update process. After updating, restart your computer and check whether the brightness slider is now active.

Adjust color temperature if brightness alone is not enough

Sometimes a screen looks dim because the color temperature is too cool (too blue). Warming the color temperature can make the screen feel brighter without actually increasing brightness. On Windows, go to Settings > Brightness and color and scroll down to "Color temperature". Drag the slider toward "Warmer" to add more yellow and red tones. On Mac, open System Settings > Displays and look for "Color temperature" — select "Warm" or adjust the slider.

You can also use a third-party tool like f.lux (free, available for Windows and Mac) to automatically adjust color temperature throughout the day. This can reduce eye strain in low-light environments while making your screen feel brighter.

Reduce glare and reflections

A screen that appears dim may actually be suffering from glare — light reflecting off the surface. Move your monitor away from windows or bright lights, or angle it so light does not reflect directly into your eyes. If you work near a window, close blinds or curtains during the brightest parts of the day. You can also buy an anti-glare screen protector that fits over your monitor, though raising brightness is usually faster and cheaper.

Clean your screen with a soft, dry cloth to remove dust and fingerprints, which can scatter light and make the display look duller than it is. Avoid using water or cleaning chemicals unless your monitor manual specifically allows it.

Check for power-saving mode

Windows and Mac both have power-saving modes that automatically lower brightness to extend battery life on laptops. On Windows, click the battery icon in the system tray (bottom-right corner) and check whether "Battery saver" is turned on — if it is, click it to turn it off. On Mac, click the battery icon in the menu bar and check the "Low Power Mode" toggle. Turning off these modes will allow your brightness to return to normal levels.

If you are using a desktop computer plugged into power, power-saving mode should not affect brightness, but it is worth checking if your screen suddenly became dim.

Adjust brightness in specific applications

Some programs like video players, photo editors, and web browsers have their own brightness controls separate from your system settings. If you are watching a video and it looks dim, check whether the video player has a brightness slider — most do. In web browsers, some websites may have brightness controls in their settings or player menus. Adjusting the process's brightness will not affect your other programs, so this is useful when only one program looks too dark.

If you are editing photos, your image editor (like Photoshop or GIMP) will have brightness and contrast sliders, but these change the image itself rather than your screen display — use your system brightness for general screen brightness and process controls only when you need to adjust the content you are working on.

Frequently Asked Questions

Why does my brightness slider not work?

Your graphics driver may be outdated or your monitor may not support software brightness control. Try updating your driver first through Device Manager (Windows) or Software Update (Mac). If that does not work, check whether your monitor has physical brightness buttons on its frame. Some older or budget monitors do not respond to software brightness commands.

Will increasing brightness damage my screen?

No, raising brightness to normal levels will not damage your screen. However, running at maximum brightness for long periods uses more power and may slightly reduce the lifespan of the backlight over many years. For everyday use, a comfortable brightness level (usually 50 to 75 percent) is fine.

My laptop screen is bright but my external monitor is dim. What do I do?

Your external monitor likely has its own brightness control separate from your laptop. Look for buttons or a dial on the monitor's frame, usually marked with a sun icon. Adjust that first. If the monitor has no physical controls, check whether it came with software for brightness adjustment — search the manufacturer's website using your monitor model number.

Does lowering brightness save battery on my laptop?

Yes, lowering brightness is one of the most effective ways to extend battery life on a laptop. The screen uses significant power, so reducing brightness by 25 to 50 percent can add an hour or more of use on battery. You can manually lower brightness or enable power-saving mode to have it adjust automatically.

Can I make my screen brighter than the maximum setting?

No, the maximum brightness setting is the limit of your screen's backlight. If your screen is already at 100 percent brightness and still looks dim, the issue is likely glare, color temperature, or a failing backlight. Try reducing glare by moving your monitor away from windows, warming the color temperature, or having a technician check whether the backlight is failing.