The fastest way to raise brightness on any computer
On most laptops, you raise brightness using the keyboard. Look for keys marked with a sun symbol — usually on the top row of your keyboard. Press the key with the brighter sun (often paired with F-key numbers like F2 or F3) to turn brightness up. On Windows desktops with a separate monitor, use the physical buttons on the monitor itself, usually located on the bottom or side bezel.
If your keyboard has no brightness keys, or if you prefer using your settings menu, you can adjust brightness through your operating system. On Windows, open Settings and go to System > Display > Brightness. On Mac, click the Apple menu, select System Settings, then Displays, and drag the brightness slider. Both methods work when ready and let you set brightness to an exact level rather than stepping up in increments.
Key Takeaways
- Laptop brightness keys are usually marked with a sun symbol and located on the top row of your keyboard, often paired with F-keys.
- Desktop monitors have physical buttons on the bezel (the frame around the screen) to control brightness independently of your computer.
- Windows computers let you adjust brightness in Settings > System > Display, while Mac computers use System Settings > Displays.
- If brightness keys do not work, check that your keyboard drivers are installed and that your monitor is plugged into power.
Brightness keys on your keyboard
Most laptops have dedicated brightness control keys on the keyboard. These are usually located on the top row and marked with a sun icon — a darker sun for decrease and a brighter sun for increase. Common locations are F2 and F3, or F11 and F12, depending on your laptop brand. straightforward press the key with the brighter sun symbol to raise the screen brightness.
Some laptops require you to hold the Fn key (usually in the bottom left corner) while pressing the brightness key. If pressing the sun key alone does nothing, try holding Fn and pressing it again. This is especially common on Dell, HP, and Lenovo laptops. The brightness will increase in steps — usually 5 to 10 percent per press — until you reach maximum.
If the brightness keys do not respond, your keyboard drivers may need updating. On Windows, right-click the Start button, select Device Manager, and look for Keyboards. If you see a yellow warning triangle next to any keyboard entry, right-click it and select Update Driver. Restart your computer after updating.
Adjusting brightness through Windows Settings
If your keyboard brightness keys are not working or you want precise control, use Windows Settings. Click the Start button, type "Settings" into the search box, and open the Settings app. Navigate to System, then Display.
Under the Display settings, you will see a "Brightness" slider. Drag it to the right to increase brightness or to the left to decrease it. Windows shows the brightness level as a percentage. You can also enable "Adaptive brightness" in the same menu, which automatically adjusts brightness based on your surroundings and battery level — useful on laptops to save power.
Some Windows computers also let you adjust brightness from the Quick Settings panel. Press Windows key + A to open Quick Settings, and look for a brightness slider at the top. This method is faster than opening the full Settings app if you only need to make a quick adjustment.
Adjusting brightness on a Mac
Mac computers control brightness through System Settings. Click the Apple menu in the top left corner, select System Settings, then click Displays in the sidebar. You will see a brightness slider — drag it to the right to increase brightness.
Macs also have keyboard shortcuts for brightness. Press F1 to decrease brightness and F2 to increase it. On newer MacBook models with Touch Bar (the thin screen at the top of the keyboard), you can tap the brightness icon directly. The brightness adjusts in small increments with each press or tap.
If you want your Mac to adjust brightness automatically based on ambient light, open System Settings > Displays and enable "Automatically adjust brightness." This feature uses your Mac's built-in light sensor to match screen brightness to your environment, which can reduce eye strain and extend battery life on laptops.
Controlling brightness on an external monitor
Desktop computers connected to external monitors control brightness through the monitor itself, not the computer. Look for physical buttons on the monitor's bezel — usually on the bottom edge or the right side. These buttons are often small and recessed to prevent accidental presses.
Press the button marked with a sun or brightness symbol to open the monitor's menu. Use the arrow buttons to navigate to Brightness and adjust it up or down. The exact button layout varies by monitor brand — Dell, LG, ASUS, and others place buttons in different locations. Check your monitor's manual if you cannot find the buttons, or search your monitor model online for a diagram.
Some monitors also include software that lets you adjust brightness from your computer. If your monitor came with a driver or control process, install it and you may be able to change brightness through Windows Settings or a dedicated app. This is less common on budget monitors but standard on high-end gaming and professional displays.
Troubleshooting brightness that will not change
If brightness keys do nothing, first check that your monitor or laptop is receiving power. A monitor that appears dim might actually be off or in sleep mode. Press any key on your keyboard or move your mouse to wake your computer, then try the brightness keys again.
On laptops, verify that Fn Lock is not enabled. Some laptops have an Fn Lock key (often Fn + Esc or Fn + a specific key) that disables function keys. If Fn Lock is on, the brightness keys will not work. Press the Fn Lock key to toggle it off, then try adjusting brightness again.
If you recently updated Windows or installed new drivers, your keyboard drivers may have been affected. Open Device Manager (right-click Start and select Device Manager), expand Keyboards, right-click your keyboard, and select Update Driver. Choose "Search automatically for updated driver software" and restart your computer when finished.
On monitors, check that the brightness control is not locked. Some monitors have a physical lock switch on the back or a menu option to lock brightness settings. Consult your monitor's manual to see if a lock feature exists and how to disable it.
Frequently Asked Questions
Why is my screen brightness stuck at a low level?
Your monitor may have a brightness lock enabled, or your graphics driver may need updating. Check your monitor's physical buttons for a lock option, and on your computer, open Device Manager and update your display driver. If you are using an external monitor, also verify the monitor is plugged into power and not in sleep mode.
Can I set brightness to turn on automatically at certain times?
Windows and Mac both offer automatic brightness adjustment based on ambient light, but neither has a built-in scheduler to change brightness at specific times. Third-party apps like f.lux (available on Windows and Mac) let you dim your screen automatically at sunset to reduce blue light exposure, which can help with sleep quality.
Does lowering brightness save battery on a laptop?
Yes, significantly. Screen brightness is one of the largest battery drains on laptops. Lowering brightness by 50 percent can extend battery life by several hours. Enabling adaptive brightness (which automatically lowers brightness in dim environments) is an effective way to balance visibility with battery life.
What if my monitor has no brightness buttons?
Some older or budget monitors do not have brightness controls. In this case, adjust brightness through your computer's display settings instead. On Windows, use Settings > System > Display. On Mac, use System Settings > Displays. This controls the brightness signal sent to the monitor, though the effect depends on the monitor's capabilities.
Is there a keyboard shortcut for brightness on Windows?
Windows does not have a universal keyboard shortcut for brightness like Mac does. Your brightness keys (usually F2 or F3 with a sun symbol) are the fastest method. If those do not work, use the Quick Settings panel (Windows key + A) or open Settings > System > Display to adjust the brightness slider.