How to Adjust Brightness on Mac: 8 Easy Methods 2026

Introduction

Knowing how to adjust brightness on a Mac is essential for comfortable viewing, whether you’re squinting at a screen in a dark room or fighting glare near a sunny window. macOS gives you multiple ways to change screen brightness—physical keys on the keyboard, sliders in Control Center and System Settings, the Touch Bar on older MacBook Pro models, and even voice commands through Siri.

This guide covers every official method, from the instant keyboard tap to fine‑tuning your display for external monitors. For the automatic brightness features that adjust based on ambient light, see our Mac auto‑brightness and True Tone guide . If you’re struggling to brighten an external display, our adjust brightness on external monitor Mac guide has the solutions.

Method 1: Use the Keyboard Brightness Keys

The fastest way to adjust brightness on a Mac is to press the dedicated brightness keys on your keyboard.

On MacBooks and Apple Magic Keyboards: Tap the F1 key (dimmer sun icon) to decrease brightness, or the F2 key (brighter sun icon) to increase it.
On desktop Macs with Apple keyboards: The F1/F2 keys work the same way if your display supports DDC/CI (most Apple and many third‑party monitors do).
On third‑party keyboards without brightness keys: You may need to use Control Center or System Settings instead.

Pressing and holding the key changes brightness smoothly. A small on‑screen indicator shows your current level. If the keys don’t work, make sure “Use F1, F2, etc. keys as standard function keys” is disabled in System Settings > Keyboard > Keyboard Shortcuts > Function Keys. When that option is enabled, you must hold the Fn key while pressing F1 or F2.

Method 2: Control Center Slider

If you prefer a visual slider, use Control Center.

Click the Control Center icon (two toggle sliders) in the menu bar.
If the Display module isn’t visible, open System Settings > Control Center and enable Show in Menu Bar under Display.
Drag the brightness slider left or right.

This method gives you finer control than the keyboard keys, especially if you want a specific percentage.

Method 3: System Settings

For even more precision, use System Settings.

Open System Settings from the Apple menu ().
Click Displays in the sidebar.
Drag the Brightness slider to your desired level.

You can also enable Automatically adjust brightness here, which lets macOS use the built‑in ambient light sensor to set the screen brightness for you. For a deep dive into that feature and when to turn it off, see our auto‑brightness and True Tone guide .

Method 4: Touch Bar (Older MacBook Pro)

If you have a MacBook Pro with a Touch Bar (2016–2019 models), you can adjust brightness directly from there.

Tap the brightness icon (sun) on the Touch Bar.
Slide your finger left or right to decrease or increase brightness.

If the brightness icon isn’t visible, customize the Control Strip: go to System Settings > Keyboard > Touch Bar settings, and drag the brightness control into the strip.

Method 5: Siri Voice Command

You can adjust brightness on a Mac without touching anything. Activate Siri (click the Siri icon in the menu bar or use the keyboard shortcut) and say:

“Increase brightness”
“Decrease brightness”
“Set brightness to 75 percent”

Siri adjusts the built‑in display only; it won’t control external monitors.

Method 6: Adjust Brightness on an External Monitor

If you use an external display that doesn’t have physical brightness buttons—or the macOS brightness keys don’t affect it—you need a different approach. Many third‑party monitors don’t support Apple’s DDC/CI brightness control natively. For a full guide on this, including tools like Lunar and MonitorControl, see our external monitor brightness guide .

Method 7: Automatically Adjust Brightness (Ambient Light Sensor)

All modern MacBooks have a built‑in ambient light sensor that adjusts screen brightness based on your surroundings. You can enable or disable this feature in System Settings > Displays > Automatically adjust brightness.

If you find your screen dimming or brightening unexpectedly, toggle this setting off. For a complete explanation of how this works alongside True Tone and Night Shift, see our auto‑brightness and True Tone guide .

Method 8: Adjust Brightness from Terminal (Advanced)

You can script brightness changes using Terminal. Install the free ddcctl utility (via Homebrew: brew install ddcctl) and run commands like:

text

ddcctl -d 1 -b 50   # Set brightness to 50%

This method is advanced and mainly useful for automation or external monitors that don’t respond to keyboard controls.

Frequently Asked Questions

Why can’t I adjust brightness on my Mac?
If the brightness keys don’t respond, check that “Use F1, F2, etc. keys as standard function keys” is off in Keyboard settings. On desktop Macs with third‑party monitors, brightness keys may not work at all—use the monitor’s physical controls or a third‑party tool.

Does adjusting brightness affect battery life?
Yes. Lower brightness extends battery life significantly, especially on MacBooks. At maximum brightness, the backlight is the single largest power draw.

Can I set different brightness levels for each display?
Yes. In System Settings > Displays, you can independently adjust the brightness of each connected display (if the display supports DDC/CI).