Your iPhone can brighten or dim the screen automatically, which is helpful until the display keeps changing when you want it to stay put. The switch is tucked inside Accessibility, not the main brightness screen. Here is the current way to turn it off and what to use when older menu paths send you to the wrong place.
Turn Off Auto-Brightness in Settings
Use the current Settings path to switch off automatic screen brightness.
- 1.Open Settings.
- 2.Tap Accessibility.
- 3.Tap Display & Text Size.
- 4.Scroll to Auto-Brightness.
- 5.Turn Auto-Brightness off.
Find Auto-Brightness With Settings Search
Use this method when the Accessibility menu feels buried or you cannot spot the toggle quickly. It takes you to the same current Auto-Brightness control.
Open Settings and tap the search field.
Type Auto-Brightness.
Tap the matching setting result.
Turn Auto-Brightness off from that screen.
Check What Auto-Brightness Controls
Auto-Brightness controls whether your iPhone adjusts screen brightness automatically in response to the light around you. Your iPhone uses its ambient light sensor to dim the screen in dark places and brighten it in bright ones.
It does not cover every kind of automatic dimming. Your screen can still dim when the iPhone gets too warm, and on supported models Always On Display keeps a dimmed Lock Screen visible. Those are separate behaviors with their own settings, so they can still dim the screen after Auto-Brightness is off.
The current control lives in Settings, then Accessibility, then Display & Text Size. That is the supported path on current iPhone software.
Display & Brightness and Control Center still let you adjust brightness manually. They are not the current place to disable Auto-Brightness.
Set Brightness Manually Afterward
Open Control Center.
Move the brightness control to the level you want.
Or open Settings.
Go to Display & Brightness.
Use the brightness control there to set the screen level manually.
Tip: after Auto-Brightness is off, use the manual brightness controls whenever the screen looks too dim or too bright.
Skip Outdated Auto-Brightness Paths
Verdict: this fixes the confusion caused by older iPhone instructions that point to menus current iPhone software no longer uses for this setting.
Do not look for Auto-Brightness in Settings, then Display & Brightness on current iPhone software.
Do not use Settings, then General, then Accessibility, then Display Accommodations as a current fix.
Use Settings, then Accessibility, then Display & Text Size, then Auto-Brightness instead.
Avoid Siri and Shortcut Workarounds
The most common cause of a failed shortcut-style fix is simple: Apple does not provide a supported way to disable Auto-Brightness through Siri, Shortcuts, Accessibility Shortcut, Action Button, Back Tap, Control Center, an app setting, a web setting, or an account portal.
Open Settings directly when you need to change this option.
Go to Accessibility.
Tap Display & Text Size.
Turn Auto-Brightness off.
Handle Work or Managed iPhones
If your iPhone is managed by a workplace, school, or organization, some device behavior may be controlled by that organization.
Apple lists an Allow auto-dim device-management restriction for Tandem OLED iPads. That does not replace the normal iPhone Auto-Brightness setting.
Start with Settings, then Accessibility, then Display & Text Size, then Auto-Brightness. If your managed iPhone will not let you change a setting, contact the organization that manages the device.
Frequently Asked Questions
Why is Auto-Brightness not under Display & Brightness on my iPhone?
Apple’s current iPhone path puts Auto-Brightness under Settings > Accessibility > Display & Text Size. Display & Brightness is for manual brightness control.
Can I disable Auto-Brightness from Control Center?
No. Control Center can adjust brightness manually, but it is not a supported place to turn Auto-Brightness off.
Can Siri turn off Auto-Brightness on iPhone?
No supported Siri command disables Auto-Brightness. Use Settings > Accessibility > Display & Text Size instead.
What should I do if I cannot find Auto-Brightness?
Open Settings, tap the search field, type Auto-Brightness, tap the matching result, and turn the toggle off.