Adjust brightness through your operating system

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 take about 10 seconds.

If you use a keyboard shortcut, it is faster still. On most Windows laptops, hold the Function key and press the brightness keys — usually marked with a sun symbol on the F1 through F12 row. On Mac, press the brightness keys in the top row (they look like a sun with lines). Desktop computers without brightness keys will need the Settings route instead.

Some laptops also have a brightness control in the taskbar or menu bar. On Windows, swipe in from the right edge of the screen to open the Action Center, where brightness appears as a quick toggle. On Mac, click the Control Center icon in the top-right corner and adjust brightness there.

Key Takeaways

  • Windows and Mac both have brightness sliders in their display settings that work in seconds and require no extra software.
  • Keyboard shortcuts using the Function key and sun-symbol keys are the fastest method on most laptops.
  • If your screen still looks dim after maxing out the brightness, the problem may be your monitor's contrast or gamma settings, not brightness alone.
  • External monitors have physical brightness buttons on the back or side that override software settings.
  • Reducing blue light in the evening with Night Light (Windows) or Night Shift (Mac) can make your screen appear brighter while protecting your eyes.

Check your monitor's physical controls

If you are using an external monitor, your computer's brightness setting may not be the issue. Most external monitors have physical buttons on the back, bottom, or side that control brightness directly on the monitor itself. Look for a button labeled with a sun symbol or a plus sign, and press it to raise the brightness.

Some monitors have an on-screen menu that appears when you press the menu button. Navigate to the brightness or backlight option using the arrow buttons, then adjust it. This method overrides your computer's software settings, so if your monitor is dim but your computer says brightness is at 100 percent, the monitor's physical control is what you need to change.

If you cannot find the buttons, check the monitor's manual or look at the back panel carefully — buttons are sometimes small or recessed. Laptop screens do not have physical buttons; they rely entirely on software control through your operating system.

Increase contrast and gamma if brightness alone is not enough

Sometimes a screen looks dim even when brightness is at maximum. The problem is often contrast or gamma, not brightness itself. Brightness controls how much light the screen puts out overall; contrast controls the difference between the darkest and lightest parts of the image.

On Windows, go to Settings > System > Display > Advanced display settings > Display adapter properties. Click the Monitor tab, then look for a Brightness and Contrast button. Increase the contrast slider. On Mac, go to System Settings > Displays > Color, then click Calibrate and adjust the gamma slider in the resulting window.

If those options do not appear, your monitor may have its own contrast control. Check the physical buttons on the monitor itself, or open the monitor's on-screen menu and look for Contrast or Gamma. Raising contrast often makes the screen look brighter without actually increasing the backlight power.

Use Night Light or Night Shift to reduce eye strain

If you brighten your screen but it still feels hard to look at, the problem may be blue light, not brightness level. Night Light (Windows) and Night Shift (Mac) reduce blue light in the evening, which can make your screen feel easier on the eyes and sometimes appear brighter in the process.

On Windows, go to Settings > System > Display and toggle Night Light on. You can set a schedule so it turns on automatically at sunset. On Mac, go to System Settings > Displays > Night Shift, choose a schedule, and adjust the color temperature slider.

These tools do not actually increase brightness — they shift the color balance toward warmer tones. But many people find that reducing blue light makes the screen feel less harsh and easier to read, especially in dim rooms or at night.

Clean your screen and check the room lighting

A screen that looks dim may straightforward be dirty. Dust, fingerprints, and smudges reduce the amount of light that reaches your eyes. Turn off your computer, wait a few minutes for it to cool, then gently wipe the screen with a microfiber cloth slightly dampened with distilled water. Do not use paper towels, tissues, or cleaning sprays — they can damage the screen coating.

Room lighting also affects how bright your screen appears. If you are in a very bright room, your screen will look dim by comparison even if it is at full brightness. Close curtains or blinds, or move your monitor away from direct sunlight. In a darker room, the same screen brightness will feel much more visible.

If you work in a bright space and cannot control the lighting, consider an anti-glare screen protector or monitor hood, which reduces reflections and can make the image appear sharper and brighter.

Update your graphics drivers

Outdated graphics drivers can sometimes cause brightness or display problems. On Windows, right-click the Start button, select Device Manager, expand Display adapters, right-click your graphics card, and select Update driver. Choose Search automatically for updated driver software and let Windows find and install any available updates.

On Mac, go to System Settings > General > Software Update and install any available updates. Mac handles graphics driver updates as part of the operating system, so there is no separate step.

After updating, restart your computer and check whether the brightness controls work better or whether the screen appears brighter at the same setting. Drivers rarely cause brightness issues, but it is worth checking if other methods have not worked.

Adjust color profile and display settings for your monitor type

Different monitor types — LCD, LED, OLED — respond differently to brightness adjustments. Some monitors also ship with color profiles that make them appear dimmer than they should. On Windows, go to Settings > System > Display > Advanced display settings > Display adapter properties, click the Color Management tab, and try a different color profile if one is available.

On Mac, go to System Settings > Displays > Color and select a different profile from the list. Some monitors come with their own color profile software; if you installed it, you can adjust brightness and contrast there as well.

If your monitor came with a manual or setup disc, it may include a color profile or brightness utility designed specifically for that model. Installing it can unlock additional brightness controls that are not available in your operating system.

Frequently Asked Questions

Why is my screen brightness stuck at a low level even when I move the slider all the way up?

Check whether your monitor has a physical brightness button on the back or side — software brightness does not override a monitor's hardware limit. If you are using a laptop, the brightness key may be stuck or the keyboard shortcut may be disabled in your BIOS. Restart your computer and try the brightness keys again, or go to Settings and adjust brightness there instead.

Does increasing brightness drain my laptop battery faster?

Yes. The screen is one of the largest power consumers on a laptop. Lowering brightness when you are on battery power can extend your battery life by 30 minutes or more, depending on how much you lower it. If you need brightness for visibility, raise it only as much as necessary.

Can I brighten my screen on an external monitor without changing my computer settings?

Yes. External monitors have their own brightness controls, usually buttons on the back or side. These work independently of your computer's brightness setting. If your monitor is dim, check the physical buttons first before adjusting your computer's settings.

What is the difference between brightness and contrast?

Brightness controls how much light the entire screen puts out. Contrast controls the difference between the darkest and lightest parts of the image. A screen can be bright but have poor contrast, making it hard to see details. Adjusting both together usually gives the best result.

Is it bad to keep my screen at maximum brightness all the time?

Maximum brightness can cause eye strain and headaches, especially in dim rooms. It also drains battery faster on laptops. Use the brightness level that lets you see clearly without discomfort — usually 50 to 75 percent in normal indoor lighting.