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, go to System, then Display, and drag the Brightness slider to the right. On Mac, click the Apple menu, select System Settings, then Displays, and move the Brightness slider up. Both systems let you set brightness to whatever level you need without installing anything.

If you use Windows 11, you can also adjust brightness from the Quick Settings panel. Press Windows key + A to open it, then drag the brightness slider. This method takes two seconds and works from anywhere on your computer.

Key Takeaways

  • Your operating system has a built-in brightness control that works when ready — Windows uses Settings > System > Display, and Mac uses System Settings > Displays.
  • Keyboard shortcuts offer the fastest adjustment: Windows laptops often have dedicated brightness keys (usually with sun symbols), and Macs use F1 and F2.
  • If your monitor has physical buttons, you can adjust brightness directly on the device itself, which overrides software settings.
  • Lowering blue light through Night Light (Windows) or Night Shift (Mac) can make your screen feel easier on the eyes, though it does not increase raw brightness.
  • If brightness maxes out and still looks dim, your monitor may be failing or your graphics driver may need an update.

Use keyboard shortcuts for when ready brightness changes

Most laptops have dedicated brightness keys built into the keyboard. Look for keys with sun symbols — usually in the F-key row. Press the key with the sun and a minus sign to dim, or the sun with a plus sign to brighten. This works when ready without opening any menu.

On Windows laptops, these keys are typically F11 (dim) and F12 (brighten), though some models use different combinations. On Mac laptops, F1 lowers brightness and F2 raises it. If your keys do not respond, you may need to hold the Fn key at the same time.

Adjust brightness directly on your monitor

Desktop monitors have physical buttons on the front or side that control brightness independent of your computer. Look for a menu button (often marked with lines or a square) and buttons labeled + and −. Press the menu button to open the on-screen display, then use the + and − buttons to find and adjust brightness.

This method is useful because it works even if your computer's software is not responding. If your monitor has no visible buttons, check the back or bottom — some models hide controls there. Your monitor's manual will show you exactly where they are.

Update your graphics driver

If your brightness controls do not work or seem stuck at a low level, your graphics driver may be outdated. On Windows, right-click the Start button, select Device Manager, expand Display adapters, right-click your graphics card, and choose Update driver. Windows will search for the latest version and install it automatically.

On Mac, brightness controls are built into the operating system, so updating macOS itself usually fixes driver problems. Go to System Settings, select General, then Software Update, and install any available updates. After updating, restart your computer and test the brightness controls again.

Check for hardware problems if brightness will not increase

If your screen stays dim even at maximum brightness, the monitor itself may be failing. Test this by connecting a different monitor to your computer — if the second monitor brightens normally, your original monitor needs repair or replacement. If the second monitor is also dim, the problem is likely your graphics card or cable connection.

Check that your monitor cable is plugged in firmly at both ends. If you use an older monitor with a VGA cable (the one with blue ends and small screws), make sure both screws are tight. Loose cables can cause dim or flickering displays. If tightening the cable does not help, the monitor is probably at the end of its life.

Reduce blue light if brightness hurts your eyes

If your screen is bright enough but causes eye strain, the problem may be blue light rather than brightness. Windows has a feature called Night Light that reduces blue light and makes the screen warmer. Open Settings, go to System > Display, scroll down to Night Light, and turn it on. You can adjust how much blue light it filters.

Mac has a similar feature called Night Shift. Go to System Settings, select Displays, then click Night Shift, and choose your preferred color temperature. Both features make the screen look slightly more orange or yellow, which many people find easier to look at for long periods. This does not increase brightness but can reduce eye fatigue.

Frequently Asked Questions

Why is my screen still dim even when brightness is at maximum?

Your monitor may be failing, or the cable connecting it to your computer may be loose. Test with a different monitor first — if that one is bright, your original monitor needs replacement. If both monitors are dim, update your graphics driver or check that your monitor cable is fully plugged in at both ends.

Do I adjust brightness on my monitor or in Windows settings?

Both work. Windows settings control the software brightness, and your monitor's physical buttons control the hardware brightness. If you have both available, use whichever is more convenient. Monitor buttons are useful because they work even if your computer is not responding.

What is the difference between brightness and Night Light?

Brightness controls how much light your screen produces overall. Night Light reduces blue light and adds warmth to the display, which can reduce eye strain but does not make the screen brighter. Use brightness to make the screen lighter, and Night Light if brightness is fine but your eyes hurt.

Can I set brightness to turn on automatically at certain times?

Yes. On Windows, open Settings > System > Display, turn on Night Light, then click Schedule to set automatic times. On Mac, go to System Settings > Displays > Night Shift and turn on Schedule. You can set it to turn on at sunset and off at sunrise, or choose specific times.

My laptop brightness keys do not work. What should I do?

Try holding the Fn key while pressing the brightness keys — some laptops require this. If that does not work, update your graphics driver through Device Manager. If brightness keys still do not respond, use the Windows Settings slider instead, or check your laptop manufacturer's support page for your specific model.