The quickest way to make text bigger or smaller on your iPhone
You can change the font size on your iPhone in two places: the system-wide text size that affects most apps, and the display zoom that makes everything on your screen larger or smaller. The system text size is the fastest adjustment—it takes about 30 seconds and works in Mail, Messages, Notes, Safari, and most other built-in apps. If you want text even larger, or if you need to enlarge everything on your screen including buttons and icons, display zoom is the tool to use.
Both settings are in the Settings app, and neither requires restarting your phone. You can adjust them as often as you want.
Key Takeaways
- Open Settings, tap Display & Brightness, then Text Size to adjust font size in most apps without changing anything else on your screen.
- Use Display & Brightness > Display Zoom to enlarge everything on your screen, including buttons, icons, and text, if standard text size adjustments are not large enough.
- Accessibility > Display & Text Size offers even larger text options and a bold text toggle for people who need more contrast.
- Text size changes take effect when ready in most apps, though some apps may need to be closed and reopened to show the new size.
- Your font size preference syncs across all your Apple devices if you use the same Apple ID and have iCloud sync turned on.
How to change text size in Settings
Open the Settings app on your home screen. Tap Display & Brightness, then scroll down and tap Text Size. You will see a slider with a small "A" on the left and a large "A" on the right. Drag the slider to the size you want. A preview of the text size appears above the slider so you can see the change before you confirm it.
Once you release the slider, the change is saved automatically. Close Settings and open any app like Mail or Notes to see the new text size in action. Most apps update when ready, though some may need to be closed completely and reopened.
Making everything on your screen larger with Display Zoom
If adjusting text size alone is not enough, you can enlarge the entire display—text, buttons, icons, and all. Go to Settings > Display & Brightness and tap Display Zoom. You will see two options: Standard (the default) and Zoomed. Tap Zoomed, then tap Set at the bottom right.
Your iPhone will restart to explore the change. When it comes back on, everything on your screen will be larger. This setting affects your home screen, app icons, and the content inside apps. You can still adjust text size separately using the Text Size slider described above—the two settings work together.
Extra-large text options in Accessibility settings
If the standard Text Size slider does not go large enough, the Accessibility menu offers even bigger options. Open Settings, tap Accessibility, then Display & Text Size. Toggle on Larger Accessibility Sizes. The Text Size slider will now extend to much larger sizes than the standard setting allows.
In the same menu, you can also toggle on Bold Text to make text thicker and easier to read. This change requires your phone to restart, but it works across nearly all apps and system text. You can combine bold text with any text size setting.
When text size changes do not show up in an app
Some apps, especially games or apps with custom designs, do not respect the system text size setting. If you change the text size and an app still looks the same, try closing the app completely and reopening it. Swipe up from the bottom of the screen (or swipe down from the top right on newer iPhones) to open the app switcher, find the app, and swipe it up to close it.
If the app still does not change, the app may have its own text size setting inside the app itself. Look in the app's settings or preferences menu—many apps let you adjust text size independently. If neither the system setting nor the app's own setting makes text large enough, contact the app's developer to ask if they plan to support larger text sizes.
How font size syncs across your devices
If you own multiple Apple devices and use the same Apple ID on all of them, your text size preference will sync automatically if you have iCloud sync turned on. This means if you change the text size on your iPhone, the same size will appear on your iPad and Mac the next time they connect to the internet.
To check that syncing is on, go to Settings > [Your Name] > iCloud and make sure iCloud Drive is toggled on. Some apps also sync their own text size settings separately through iCloud, so you may see text size preferences sync even faster in those apps.
Troubleshooting text size that will not change
If you have adjusted the Text Size slider but the text in your apps has not changed, first check whether you are in the right menu. Text Size in Display & Brightness affects most apps, but some apps ignore it. Go back to Settings > Display & Brightness > Text Size and make sure the slider is where you left it—sometimes it resets if a setting conflicts with another feature.
If the slider is in the right place but text is still not changing, restart your iPhone. Press and hold the side button and either volume button until the power-off slider appears, then drag it to turn off your phone. Wait 10 seconds, then press and hold the side button again until the Apple logo appears. After your phone restarts, open an app and check whether the text size has updated.
Frequently Asked Questions
Can I change font size for just one app?
The system text size setting affects most apps at once. However, some apps have their own text size controls in their settings menu—look inside the app itself, not in Settings. If an app does not have its own text size option, you cannot change the size for that app alone without changing it system-wide.
Will changing text size make my battery drain faster?
No. Changing text size does not affect battery life. The text is straightforward rendered at a different size; it uses the same amount of power either way. Bold text may use slightly more power on older iPhones with LCD screens, but the difference is not noticeable.
What is the difference between Text Size and Display Zoom?
Text Size only enlarges text in apps. Display Zoom enlarges everything on your screen—text, buttons, icons, and app layouts. Use Text Size if you want to keep your screen layout the same but read text more easily. Use Display Zoom if you want the entire interface bigger.
Can I undo a text size change?
Yes. Go back to Settings > Display & Brightness > Text Size and drag the slider to a different position. The change takes effect when ready. If you want to return to the default size, move the slider to the middle position.
Does changing font size on iPhone affect my Mac or iPad?
If you use the same Apple ID and have iCloud sync on, your text size preference will sync to your other devices. However, some devices may not support the exact same range of sizes, so the text may appear slightly different on each device even though the setting is the same.