The fastest way to brighten your screen

Most laptops have brightness keys on the keyboard — usually marked with a sun symbol and located on the F-keys (F1 through F12). Press the key with the sun and an upward arrow, or hold it down, to increase brightness. On some models you need to hold the Fn key at the same time. If your keyboard has dedicated brightness buttons separate from the F-keys, use those instead.

If the keyboard method does not work, or if you want finer control, you can adjust brightness through your operating system settings. The method differs between Windows and Mac, but both take under a minute.

Key Takeaways

  • Keyboard brightness keys (usually F-keys with a sun symbol) are the quickest way to adjust screen brightness on most laptops.
  • Windows users can also adjust brightness in Settings under System > Display, or by right-clicking the battery icon in the taskbar.
  • Mac users can increase brightness using the F2 key or through System Settings > Displays.
  • If your screen is dim but brightness controls do not help, check whether battery saver or low-power mode is turned on, as these limit brightness automatically.
  • Adjusting brightness in your display driver settings (Windows) or color profile (Mac) offers more detailed control than operating system menus.

Brightness adjustment on Windows laptops

On Windows, the quickest method is the keyboard. Look for the F-key with a sun symbol pointing upward — this is usually F11 or F12, but varies by manufacturer. Press it repeatedly or hold it down to brighten the screen. If nothing happens, try holding Fn plus the brightness key at the same time.

If keyboard keys do not work, open Settings by pressing Windows key + I. Go to System, then Display. Under "Brightness and color," you will see a slider labeled "Brightness." Drag it to the right to increase brightness. This method works on all Windows versions but may look slightly different depending on whether you have Windows 10 or Windows 11.

Another option is to right-click the battery icon in the bottom-right corner of your taskbar. Select "Adjust screen brightness" or "Power settings," and you will see a brightness slider. This route is faster if you already have the taskbar visible.

Brightness adjustment on Mac laptops

On a Mac, press the F2 key to brighten the screen, or F1 to dim it. Hold the key down to adjust continuously. This works on all recent MacBook models.

If the F-keys do not respond, open System Settings by clicking the Apple menu in the top-left corner and selecting "System Settings." Click Displays in the sidebar. You will see a "Brightness" slider — drag it to the right. On newer Macs with an M1 or M2 chip, this slider appears at the top of the Displays window.

Some Mac users also have brightness controls in Control Center. Swipe down from the top-right corner of the screen (on newer MacBooks) or up from the bottom-right corner (on older models) to open Control Center, then adjust the brightness slider there.

When brightness controls do not seem to work

If you have adjusted brightness to maximum and the screen is still dim, check whether your laptop is in battery saver mode or low-power mode. These modes limit brightness automatically to extend battery life. On Windows, open Settings > System > Battery, and turn off "Battery saver" if it is on. On Mac, go to System Settings > General > Low Power Mode and toggle it off.

Another common cause is an outdated or missing display driver on Windows. Open Device Manager by right-clicking the Start button and selecting "Device Manager." Expand "Display adapters," right-click your graphics card, and select "Update driver." Windows will search for the latest version. If an update is found, install it and restart your laptop.

If your screen is still dim after these steps, the brightness sensor may be interfering. Some laptops have an ambient light sensor that automatically adjusts brightness based on the room. On Windows, go to Settings > System > Display and scroll down to find "Brightness" options — look for "Change brightness automatically" and toggle it off. On Mac, go to System Settings > Displays and uncheck "Automatically adjust brightness."

Adjusting brightness through display driver settings

Windows users can access more detailed brightness controls through the graphics driver. Right-click on your desktop and look for an option like "Intel Graphics Settings," "NVIDIA Control Panel," or "AMD Radeon Settings," depending on your graphics card. Open the driver software and look for a "Display" or "Color" section. Here you can adjust brightness, contrast, and gamma — these settings give you more precision than the Windows operating system menu.

This method is useful if you want different brightness levels for different tasks, or if you want to save a custom brightness profile. However, for most users, the keyboard keys or Windows Settings are sufficient.

Brightness and external monitors

If you are using an external monitor connected to your laptop, the laptop keyboard brightness keys will only adjust the laptop screen, not the monitor. To brighten an external monitor, use the physical buttons on the monitor itself — usually located on the bottom or side of the frame. Look for buttons labeled with a sun symbol or marked as "Menu." Press the menu button to open the monitor's on-screen display, then navigate to brightness and adjust it.

Some external monitors also have brightness controls in their own software, which you can read from the manufacturer's website. This is less common but useful if your monitor has many adjustable settings.

Why your screen might be too dim even at maximum brightness

Laptop screens dim over time as the backlight ages. If your laptop is several years old and the screen has always been dim even at maximum brightness, the backlight may be failing. This is a hardware issue that requires professional repair or screen replacement.

Screen protectors or anti-glare films can also reduce brightness. If you recently added a screen protector and the brightness dropped noticeably, try removing it to see if brightness returns to normal.

Dust or dirt on the screen does not reduce brightness, but it can make the screen appear dimmer by blocking light. Clean your screen gently with a microfiber cloth to rule this out.

Frequently Asked Questions

Why does my brightness keep resetting to low after I restart?

This usually means battery saver or low-power mode is turning on automatically. Check your power settings and disable automatic low-power mode, or set it to turn on only at a very low battery percentage. On Windows, go to Settings > System > Battery and adjust the "Battery saver" threshold. On Mac, go to System Settings > General > Low Power Mode and toggle it off.

Can I set different brightness levels for different programs?

The operating system does not offer this feature natively, but some third-party software on Windows allows you to create brightness profiles. However, the simplest approach is to adjust brightness manually when you switch tasks, using the keyboard keys or settings menu.

Is it bad for my eyes to use maximum brightness?

Very bright screens can cause eye strain in dark rooms. If you work in low light, try using a brightness level that is comfortable for your eyes rather than always maxing it out. Many laptops also have a blue light filter (called "Night Light" on Windows or "Night Shift" on Mac) that reduces eye strain in the evening.

My external monitor is too bright even at minimum brightness — how do I fix this?

Use the monitor's physical buttons to access its menu, then look for an option to reduce brightness or contrast. Some monitors also have an "eco mode" that lowers brightness and power consumption. If the monitor is still too bright, you can place a neutral density filter over the screen, though this is a last resort.

Do I need to install anything to adjust brightness?

No. Brightness adjustment is built into Windows and Mac, and keyboard controls work without any additional software. If you want advanced controls through your graphics driver, you may need to read the driver software from your graphics card manufacturer, but this is optional.