How to Enable Auto Brightness on iPhone 15: Step-by-Step Guide

Enabling auto brightness on your iPhone 15 is a simple process that adjusts your screen’s brightness based on the ambient light around you. All you have to do is head to your settings, tap on accessibility, select display & text size, and finally toggle on the auto-brightness feature. Once you’ve done this, your iPhone 15 will automatically adjust its brightness, so you don’t have to.

Step by Step Tutorial: Enable Auto Brightness on iPhone 15

Before diving into the steps, it’s important to note that enabling auto-brightness can help extend your battery life and make your screen easier on the eyes. For more about improving iPhone battery life, visit Let’s get started!

Step 1: Open Settings

Open the Settings app on your iPhone 15.

The Settings app is typically found on your home screen and has a gear icon. If you can’t find it, swipe down on your home screen and use the search bar to locate it.

Step 2: Tap on Accessibility

Scroll down and tap on the Accessibility option.

Accessibility features are designed to make using your iPhone easier for everyone. Auto-brightness is one of many features you can find in this section.

Step 3: Select Display & Text Size

In the Accessibility menu, find and select the Display & Text Size option.

This section contains settings that affect how things look on your screen, including text size and other display preferences.

Step 4: Toggle on Auto-Brightness

Scroll down to the bottom of the Display & Text Size menu and toggle on the switch for Auto-Brightness.

When the switch is green, auto-brightness is activated. Your iPhone will now adjust its screen brightness based on the surrounding light conditions.

After completing these steps, your iPhone 15 will automatically adjust its brightness, which can help reduce eye strain and save battery life. If you ever want to adjust your brightness manually, you can still do so through the Control Center by swiping down from the top-right corner of your screen.

Tips: Enable Auto Brightness on iPhone 15

  • Make sure your iPhone 15 is updated to the latest iOS version for the best performance.
  • If you’re in a dark room and the screen seems too bright, give it a moment to adjust before changing the settings manually.
  • Remember that auto-brightness is designed to learn your preferences over time, so it might take a few days to adjust to your liking perfectly.
  • You can override auto-brightness by manually adjusting your screen brightness in the Control Center.
  • If you find that auto-brightness isn’t working as it should, try restarting your iPhone 15.

Frequently Asked Questions

Will enabling auto-brightness drain my iPhone 15 battery?

No, enabling auto-brightness can actually help extend your battery life by adjusting the screen brightness to optimal levels, reducing unnecessary power usage.

Can I still adjust my screen brightness after enabling auto-brightness?

Yes, you can still adjust your screen brightness manually through the Control Center, even with auto-brightness enabled.

What should I do if auto-brightness isn’t adjusting correctly?

If auto-brightness isn’t adjusting as expected, you can try restarting your iPhone 15 or resetting all settings from the General section in the Settings app.

Does auto-brightness work in all apps?

Auto-brightness works system-wide, which means it should adjust your screen brightness in all apps. However, some apps may have their own brightness settings that can override the system settings.

Can I set a schedule for auto-brightness?

Auto-brightness doesn’t have a scheduling feature, but you can schedule Night Shift and True Tone, which also affect the display’s appearance.


  1. Open the Settings app.
  2. Tap on Accessibility.
  3. Select Display & Text Size.
  4. Toggle on Auto-Brightness.


And there you have it, a simple and straightforward guide to enabling auto brightness on your iPhone 15. With auto-brightness activated, you can enjoy a more comfortable viewing experience while also conserving your device’s battery life. The process is so quick and easy that you’ll wonder why you hadn’t turned it on sooner. Plus, with the additional tips and answers to frequently asked questions, you’re now well-equipped to tackle any issues that may arise with this helpful feature.

Remember, technology is meant to make our lives easier, and the auto-brightness function is just one of the many smart features built into your iPhone 15 to do just that. So, go ahead and give your eyes—and battery—a break by enabling auto brightness today. If you ever run into any issues or have questions about other iPhone 15 features, there’s a wealth of resources available online to help you out. Happy brightening!