Where to find the keyboard light control on your device

Most keyboards with backlighting have a dedicated key or key combination to turn the light on and off. The exact method depends on whether you have a laptop, desktop keyboard, or external mechanical keyboard — and which operating system you use.

On laptops, the backlight control is usually built into the keyboard itself. Look for keys with a light bulb icon or sun symbol, often in the top row near the function keys. On desktop keyboards, the control might be a physical button on the keyboard, a software setting, or both. External mechanical keyboards often have a button on the underside or a key combination you can program.

Key Takeaways

  • Most laptop keyboards use Fn + a function key with a light icon to toggle the backlight on and off.
  • The brightness level usually cycles through off, dim, and bright with repeated presses of the same key combination.
  • Desktop keyboards may require software from the manufacturer to control the backlight, even if the keyboard has RGB lighting.
  • Some keyboards have a physical button or switch on the underside or side that controls the backlight independently of software.
  • If your keyboard has no visible control, check the manufacturer's manual or software — the feature may not be present on that model.

Windows laptop keyboards

On most Windows laptops, press Fn + the key with a light icon. This is usually in the top row and may show a bulb, sun, or lines of light. The first press turns the backlight on; pressing again cycles through brightness levels, and a third press turns it off.

Some laptops use different key combinations. Dell laptops often use Fn + Right Arrow or Fn + Left Arrow. HP and Lenovo sometimes use Fn + Spacebar or Fn + a dedicated key. If you are not sure which key, look at the top row of your keyboard for any symbol that suggests light or brightness.

If the key combination does not work, the keyboard may not have a backlight, or the feature may be disabled in your BIOS settings. Restart your laptop, press F2, F10, or Delete during startup (depending on your manufacturer), and look for a setting called "Keyboard Backlight" or "Illumination" to turn it on.

Mac laptop keyboards

On MacBooks, use Fn + F5 to dim the backlight and Fn + F6 to brighten it. These keys are in the top row and show a light bulb icon. Pressing F5 repeatedly will eventually turn the backlight off completely.

If these keys do not work, your MacBook model may not have keyboard backlighting. Most newer MacBooks with Apple Silicon (M1, M2, M3 chips) do not include this feature. Older Intel-based MacBooks from 2015 and earlier usually have it.

Desktop keyboards with dedicated buttons

Many external keyboards and mechanical keyboards have a physical button or switch to control the backlight. Look on the underside, the back edge, or the sides of the keyboard. Some have a small rocker switch; others have a button you press. Check your keyboard's manual if you cannot find it visually.

If your keyboard has RGB lighting (multiple colors), the button may cycle through different colors and brightness levels with each press. Some keyboards also let you hold the button down to adjust brightness continuously.

Desktop keyboards that need software

Gaming keyboards and high-end mechanical keyboards often require manufacturer software to control the backlight. Common software includes Corsair iCUE, Razer Synapse, SteelSeries GG, and Logitech G Hub. Download the software from the manufacturer's website, install it, and connect your keyboard via USB.

Once the software is open, look for a section called "Lighting," "RGB," or "Backlight." You can usually turn the light on and off, adjust brightness, and change colors from there. Some software also lets you set the backlight to turn off automatically after a period of inactivity.

If you lose the software or it stops working after an update, reinstall it from the manufacturer's website. If the keyboard still does not respond, try unplugging it, waiting 10 seconds, and plugging it back in. Some keyboards also have a reset button on the underside.

Troubleshooting when the backlight will not turn on

If you have tried the key combination or button and nothing happens, the backlight may be disabled in software or hardware. First, check whether your keyboard model actually has backlighting — not all keyboards do. Look at the product name or manual to confirm.

On Windows, open Settings, go to Devices, then Keyboard, and look for any option related to keyboard illumination or backlight. On Mac, go to System Settings, then Keyboard, and check for a backlight option. If you see a toggle, make sure it is turned on.

If the backlight worked before but stopped, the battery may be low on a wireless keyboard. Plug in a wired keyboard or replace the batteries in a wireless one. For laptops, a BIOS update or hardware failure could also prevent the backlight from working — if nothing else works, contact the manufacturer's support.

Frequently Asked Questions

Does turning on the keyboard backlight drain the battery faster?

Yes, but not dramatically. A keyboard backlight uses a small amount of power. On a laptop, you might lose 5 to 10 percent of battery life if you keep it on all day. If battery life matters, turn the backlight off or set it to the lowest brightness level.

Can I set the backlight to turn on automatically when it gets dark?

Some gaming keyboards with software can do this, but most standard keyboards cannot. Check your manufacturer's software to see if an ambient light sensor option exists. On laptops, the backlight usually does not have this feature built in.

Why does my keyboard backlight flicker or turn off randomly?

This usually means the keyboard is overheating or the connection is loose. On wired keyboards, try a different USB port. On wireless keyboards, replace the batteries and move the receiver closer. If it continues, the backlight hardware may be failing — contact the manufacturer.

Is keyboard backlighting bad for my eyes?

No. A keyboard backlight is dim and you are not looking directly at it. It actually helps reduce eye strain in dark rooms by letting you see the keys without staring at a bright screen. Keep the brightness at a comfortable level rather than maximum.

Can I replace the backlight if it burns out?

On most laptops and external keyboards, the backlight cannot be replaced without replacing the entire keyboard. On some high-end mechanical keyboards, individual LED switches can be swapped out, but this requires opening the keyboard and soldering. For most users, a burned-out backlight means buying a new keyboard.