How to Turn Off Auto-Brightness on iPhone (iOS 17 and Later)
By default, your iPhone automatically adjusts the screen brightness based on the lighting around you. It’s a useful feature for saving battery and improving visibility, but sometimes it can get annoying—especially if your screen keeps dimming or brightening when you don’t want it to.
If you’re digging through Settings > Display & Brightness and can’t find the toggle for auto-brightness, you’re not alone. Apple moved it somewhere else, and it’s a bit buried. Here’s how to turn it off.
Turn Off Auto-Brightness on iPhone
- Open the Settings app.
- Scroll down and tap Accessibility.
- Tap Display & Text Size.
- Scroll all the way to the bottom.
- Toggle Auto-Brightness off.
That’s it. Your iPhone will no longer adjust brightness automatically based on ambient light.
Keep in Mind: Battery and Screen Health
Disabling auto-brightness means your screen might stay brighter than necessary, which can:
- Drain your battery faster
- Increase long-term wear on your display if left at max brightness constantly
If you’re going to turn it off, try not to leave your brightness cranked up all the time—just adjust it as needed.