The quickest way to make text bigger or smaller

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 takes about 30 seconds to adjust and works in Mail, Messages, Notes, and most third-party apps. If you want text bigger across your entire phone—including in Safari, Settings, and the home screen—you'll use display zoom instead, which is a separate setting.

Both methods are in the Settings app. You don't need to restart your phone or read anything. The changes take effect when ready.

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 make everything larger, including icons and buttons, though this uses more battery.
  • You can also enable Larger Accessibility Sizes in Settings > Accessibility > Display & Text Size for even bigger text options.
  • Some apps like Safari and Mail have their own text size controls that override the system setting.
  • Changes take effect when ready and don't require restarting your phone.

Change text size in most apps

Open the Settings app on your home screen. Tap Display & Brightness, then scroll down and tap Text Size. You'll see a slider with a small "A" on the left and a large "A" on the right. Drag the slider to the right to make text bigger, or to the left to make it smaller. The preview text above the slider updates as you move it, so you can see the change before you confirm.

This setting affects Mail, Messages, Notes, Reminders, Calendar, and most third-party apps. It does not change the size of icons, buttons, or the text in Settings itself. When you're happy with the size, just close Settings—the change is saved automatically.

Make everything larger with display zoom

If you want text, icons, and buttons all bigger at the same time, use display zoom instead. Go to Settings > Display & Brightness and tap Display Zoom. You'll see two options: Standard and Zoomed. Tap Zoomed, then tap Set at the bottom right.

Your phone will restart, and when it comes back on, everything will be larger—text, icons, buttons, and the home screen grid. This uses more battery power because your screen has to work harder to display larger elements. If you change your mind, go back to Display & Brightness > Display Zoom and select Standard.

Use accessibility sizes for maximum text enlargement

If the standard text size slider doesn't go large enough, you can unlock even bigger options. Go to Settings > Accessibility > Display & Text Size and turn on Larger Accessibility Sizes. When you do, the Text Size slider in Display & Brightness will extend further to the right, giving you up to seven additional size levels.

This setting is designed for people who need significantly larger text, but anyone can use it. The larger sizes work in the same apps as the standard text size setting. Turning on Larger Accessibility Sizes does not change anything else on your phone.

Adjust text size in individual apps

Some apps have their own text size controls that override the system setting. In Safari, open a webpage, tap the Aa button at the top of the screen, and use the slider to change the text size for that page. In Mail, open a message, tap the three dots at the bottom right, and look for a text size option.

These app-specific controls only affect that one app or that one message. They're useful if you want larger text in Safari but not everywhere else on your phone. Check the app's menu or settings if you can't find the text size control—not every app has one.

Undo a text size change

If you made text too large or too small and want to go back, the process is the same as changing it. Open Settings > Display & Brightness > Text Size and move the slider back to where it was. If you used Display Zoom, go to Settings > Display & Brightness > Display Zoom and select Standard (your phone will restart).

There's no "undo" button—you have to manually adjust the slider again. If you don't remember what size you had before, try starting in the middle of the slider and adjusting from there. Most people find the default setting (roughly in the middle) works well for everyday use.

Common mistakes to avoid

Don't confuse Text Size with Display Zoom. Text Size only changes the font in certain apps, while Display Zoom makes everything bigger and uses more battery. If you want only text bigger and nothing else, use Text Size. If you want your whole screen bigger, use Display Zoom.

If you turn on Larger Accessibility Sizes but the text still isn't big enough, make sure you're also moving the Text Size slider all the way to the right. The accessibility setting unlocks the larger end of the slider—it doesn't automatically make text huge on its own. Also remember that some apps like Safari have their own text controls, so adjusting the system text size won't affect them unless you change the app's settings too.

Frequently Asked Questions

Will changing text size affect my battery life?

Using the Text Size slider has no effect on battery life. Using Display Zoom does use slightly more battery because your screen has to render larger elements, but the difference is usually small unless you're a very heavy user. If battery life is a concern, stick with Text Size instead of Display Zoom.

Can I set different text sizes for different apps?

The system text size applies to all compatible apps at once. However, some apps like Safari and Mail have their own text controls, so you can make text bigger in those apps without changing the system setting. For most apps, you're limited to one system-wide size.

What if text is still too small after I max out the slider?

Turn on Larger Accessibility Sizes in Settings > Accessibility > Display & Text Size. This extends the Text Size slider further to the right and gives you seven additional size levels. If that's still not enough, use Display Zoom to make everything on your screen larger.

Does changing font size affect the lock screen or home screen?

The Text Size setting does not change text on the lock screen or home screen. Display Zoom does make home screen icons and labels larger. If you want bigger text on your lock screen, that's controlled separately in Settings > Accessibility > Display & Text Size under "Bold Text" or "Increase Contrast"—though those settings change the weight of the text, not the size.

Can I change font size in iMessage or text messages?

Yes. The system Text Size setting controls the font size in Messages. Open Settings > Display & Brightness > Text Size and adjust the slider. The change takes effect when ready the next time you open Messages. Some older iPhones may not support this feature, but all current models do.