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

Enabling auto brightness on your iPhone 15 is a simple task that can be done in just a few taps. This feature automatically adjusts your screen’s brightness based on the ambient light around you, which can help save battery life and reduce eye strain. Let’s delve into how you can set up auto brightness on your iPhone 15, step by step.

Step by Step Tutorial: Enable Auto Brightness on iPhone 15

Before we jump into the steps, understand that enabling auto brightness will allow your iPhone to use its sensors to detect the lighting conditions around you and adjust the screen brightness accordingly. It’s a smart way to keep your screen visible and comfortable for your eyes, no matter where you are.

Step 1: Open the Settings App

Start by tapping the Settings icon on your home screen.

The Settings app is where you can tweak and customize various aspects of your iPhone, including display settings.

Step 2: Scroll Down and Tap on Accessibility

Once in Settings, scroll down until you find the Accessibility option and tap it.

Accessibility settings are designed to make your iPhone easier to use for those who may have visual, physical, or other impairments, but they also house the auto brightness feature.

Step 3: Tap on Display & Text Size

In the Accessibility menu, look for Display & Text Size and select it.

This is where you can adjust settings that affect the appearance of content on your screen.

Step 4: Find and Toggle on Auto-Brightness

Scroll down until you see the Auto-Brightness option, then toggle the switch to turn it on.

Once Auto-Brightness is enabled, you’ll notice your screen brightness adjusting automatically as you move between different lighting environments.

After completing these steps, your iPhone 15 will now automatically adjust its screen brightness depending on the lighting conditions in your environment. This will not only help in maintaining optimal visibility of your screen but also conserve your battery life since the screen often consumes a significant amount of power.

Tips: Making the Most of Auto Brightness on iPhone 15

  • Keep your iPhone’s sensors clean; dust or debris covering the sensors can affect auto brightness accuracy.
  • If you’re in a particularly dark or bright environment, you may still need to manually adjust your brightness to see your screen comfortably.
  • Remember that auto brightness adjusts over time, so give it a moment to adapt to new lighting conditions.
  • If you find your screen is too bright at night, even with auto brightness enabled, consider using Night Shift to reduce blue light exposure.
  • Disable auto brightness in specific situations, like when showing photos or videos to others, where consistent screen brightness is needed.

Frequently Asked Questions

Is auto brightness really beneficial for my iPhone battery life?

Yes, auto brightness can help extend your battery life by reducing screen brightness in well-lit areas, lessening the energy consumption of the display.

Can I still adjust my brightness manually with auto brightness enabled?

Absolutely, you can always manually adjust your screen brightness even when auto brightness is on. The feature will resume its automatic adjustments after a short period.

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

First, make sure the sensors on your iPhone are clean. If the issue persists, try restarting your device. If it still doesn’t work, contact Apple support.

Will auto brightness affect my screen’s appearance in photos?

No, auto brightness only changes how you see the screen, not how it appears in photos or screenshots.

Can auto brightness be used in all apps?

Yes, auto brightness works across the entire system, regardless of the app you’re using.


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


Enabling auto brightness on your iPhone 15 is a smart move for anyone looking to improve their overall user experience. Not only does it make your screen more comfortable to look at in varying lighting conditions, but it also helps conserve battery life, which is always a plus. Remember, this feature is there to make your life easier, but you still have full control over your screen’s brightness, should you need to make manual adjustments. With the steps outlined above, you should now have a clear understanding of how to enable auto brightness on iPhone 15 and make the most out of this convenient feature. So go on, give your eyes—and battery—a break, and let your iPhone do the work for you!