It's late, the room is dark, your display is dimmed all the way down, and your keyboard is still glowing like a runway. If your MacBook's keyboard backlight feels too bright at night, here is every fix, from the built-in settings most people miss to the one option macOS doesn't offer at all.
This is the most common culprit. macOS watches the ambient light sensor and raises keyboard brightness automatically in low light, which is precisely when you want it dim. So you turn it down, and a few minutes later it's bright again.
Your manual setting now sticks.
By default, changing keyboard brightness means a trip into System Settings. Add the slider to Control Center instead:
Now you can drag it down from the menu bar whenever the room changes.
In System Settings > Keyboard you can set the backlight to turn off after 5 seconds to 5 minutes of inactivity. Good for battery and for a glowing keyboard you're not touching, but it does nothing while you're actually typing.
Drag the brightness slider all the way to the left and the backlight goes dark. This is macOS's only answer for "the minimum is still too bright", and it has an obvious problem: now you can't see the keys at all. In a truly dark room you're back to hunt-and-peck.
Here's the real issue: on Apple Silicon MacBooks there's a large gap between the dimmest setting macOS allows and "off". The hardware supports dozens of brightness steps in that gap, but macOS enforces a floor and won't let you use them. That floor is why the lowest setting still feels bright, and some models have a noticeably higher floor than others. We covered why Apple locks the backlight floor separately.
Midnight Keyboard is a menu bar app that unlocks that gap. It gives you 10 brightness levels below the macOS minimum, down to a glow roughly 20 times dimmer than Apple's floor: enough to read the key legends without lighting up the room. There's a step-by-step guide in How to Dim Your MacBook Keyboard Backlight Below the Minimum.
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If the backlight keeps getting brighter on its own, Fix 1 solves it. If the minimum brightness is fine for you and you just want faster control, Fix 2. If the minimum itself is the problem, which is the usual complaint on newer MacBook Air and Pro models, the built-in options can't help: your choice is Fix 4 (off) or Fix 5 (dimmer than minimum).