How to Adjust the Keyboard Backlight on a MacBook

Every MacBook keyboard is backlit, but where the brightness control lives depends on which MacBook you own. Older models put it on dedicated keys; Apple silicon models moved it into Control Center and gave the function row to other jobs. Here's every way to adjust it — and what to check when the backlight refuses to come on at all.

The two places the control lives

• Function keys — on MacBooks whose F5 and F6 keys carry the little backlight glyphs (most Intel models, and any Mac with a Touch Bar via the Control Strip), tap F5 to dim and F6 to brighten. Sixteen presses take you from off to full.
• Control Center — on MacBooks from 2021 onward, the function row has no backlight keys, so click the Control Center icon in the menu bar and look for Keyboard Brightness. Drag the slider wherever you like.

If Keyboard Brightness isn't in your Control Center, add it: open System Settings → Control Center, find Keyboard Brightness, and choose to show it in Control Center — or in the menu bar itself, which gives you a one-click slider without opening Control Center first. Removing it later from the same menu is the undo.

Let macOS handle it automatically

1. Open System Settings → Keyboard.
2. Turn on Adjust keyboard brightness in low light.

With this on, the ambient light sensor near the camera raises the backlight in a dim room and cuts it in daylight, saving battery. The toggle works the same on macOS 13 Ventura through 15 Sequoia, and switching it off returns you to fully manual control. Manual adjustments still work while it's on — they just get revised the next time the ambient light changes noticeably.

When the backlight won't turn on

Nine times out of ten this is the ambient light sensor doing its job too well. The sensor sits next to the FaceTime camera, and a desk lamp or window directly above it convinces macOS the room is bright, so the backlight stays off no matter what the slider says. Test it: cup your hand over the top of the display and watch the keys — if they glow, nothing is broken. Fixes, in order:

1. Turn off Adjust keyboard brightness in low light and set the level manually.
2. Check the slider isn't simply at zero — in Control Center, drag Keyboard Brightness up.
3. If you use the timeout setting, note the backlight switching off after idle is separate behaviour — Turn keyboard backlight off after inactivity in the Keyboard pane controls it.
4. Still dark after all three? Restart the Mac. Backlight control very occasionally wedges until the next boot; a genuine hardware failure is rare and usually accompanied by other keyboard faults.

Battery cost, honestly

The backlight is LEDs under keycaps, not a display panel — at half brightness it costs you a few percent of battery over a long day, at full brightness a little more. It's worth managing on a flight, which is exactly what the low-light auto-adjust and the inactivity timeout do for you without any thought. If you want the maximum-runtime setup: auto-adjust on, timeout at ten seconds, and the Control Center slider for the rare manual override.

One more note for external keyboard users: backlight settings control the built-in keyboard only. A Magic Keyboard has no backlight at all, and third-party backlit keyboards manage their own lighting with their own keys or software — the macOS slider won't touch them. If you work clamshell-style with the MacBook lid closed, there's nothing to light anyway, and the settings in this guide simply sit dormant until you open the lid again. Everything here is per-Mac and per-user, and every change reverses from exactly the place you made it — sliders slide back, toggles toggle off.

Make it switch off by itself

The companion setting to brightness is the idle timer — turn the keyboard backlight off after inactivity and it stops burning battery the moment you walk away.