The quickest way to make text bigger or smaller

You can change text size on iPhone in two places: in individual apps through their own settings, or across your entire phone through the system-wide accessibility menu. The system-wide method is faster if you want everything larger, but some apps let you adjust text independently. Both methods take less than a minute.

The system-wide approach works in Mail, Messages, Notes, and many other built-in apps. Open Settings, tap Display & Brightness, then tap Text Size and drag the slider. The preview text at the top shows you what size you're choosing before you confirm.

If you want text bigger in a specific app like Safari or News, look for a text size button within that app itself — usually an "A" with a plus or minus sign, or a slider icon. Not every app has this option, but most reading apps do.

Key Takeaways

  • System-wide text size changes happen in Settings > Display & Brightness > Text Size, and affect Mail, Messages, Notes, and similar apps.
  • Individual apps like Safari, News, and Books have their own text size controls, usually marked with an "A" icon or slider.
  • If standard text size adjustment isn't enough, you can turn on Larger Accessibility Sizes in Settings > Accessibility > Display & Text Size for even bigger text.
  • Text size changes take effect immediately and don't require you to close and reopen apps.

Changing text size through Settings for most apps

Open the Settings app on your home screen. Scroll down and tap Display & Brightness — it's usually near the top of the list. Then 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 size you want. The preview text above the slider updates in real time, so you can see exactly what your text will look like before you confirm. Tap the back arrow or swipe back when you're happy with the size.

This change applies to Mail, Messages, Notes, Reminders, Calendar, and other system apps. It does not affect Safari, News, Books, or third-party apps — those have their own controls.

Adjusting text in Safari and web browsers

Open Safari and navigate to any webpage. Tap the "aA" icon in the top right corner of the address bar. A menu appears with two options: make text smaller (left side) or larger (right side). Tap the size you want.

This setting is per-website, so different sites can have different text sizes. If you want to reset a site back to its default size, tap the "aA" icon again and tap the middle option.

Other browsers like Chrome and Firefox have similar controls. Look for a text size or display settings option in the app's menu.

Making text even larger with accessibility settings

If the standard Text Size slider isn't large enough, iPhone has a second layer called Larger Accessibility Sizes. Open Settings, tap Accessibility, then tap Display & Text Size. Toggle on Larger Accessibility Sizes.

Once you turn this on, the Text Size slider in Settings > Display & Brightness expands to include much larger options. This is useful if you have low vision or simply prefer very large text. The change applies to the same apps as the standard text size setting.

You can also enable Bold Text in the same Accessibility menu if you want text to appear heavier and darker in addition to larger.

Text size in Books, News, and reading apps

Open the Books app and start reading a book. Tap the middle of the page to bring up the reading controls. Tap the "aA" icon (usually in the top right). A menu appears with text size options — tap the size you want, or use the slider to fine-tune it.

The News app works the same way: open an article, tap the menu icon (three dots or lines), and look for text size or display options. Some news apps have a dedicated text size button on the reading screen itself.

These settings are usually saved per app, so your preferred size in Books stays the way you set it even after you close and reopen the app.

What to do if text size won't change

If you've adjusted the Text Size slider but text in an app hasn't changed, the app may have its own text size setting that overrides the system setting. Open that app and look for a text size or display option within its own menu or settings.

Some third-party apps ignore the system text size entirely and only respond to their own controls. If an app has no text size option of its own, you may not be able to change text size within that specific app — but you can still use the system-wide setting for other apps.

If text is still too small after you've tried both the system setting and the app's own controls, try enabling Larger Accessibility Sizes as described above. That usually solves the problem.

Frequently Asked Questions

Does changing text size affect all apps?

No. The system-wide Text Size setting in Display & Brightness affects Mail, Messages, Notes, and similar built-in apps, but not Safari, News, Books, or most third-party apps. Those apps have their own text size controls.

Will changing text size make my battery drain faster?

No. Text size has no effect on battery life. Changing how large text appears on your screen doesn't use more power.

Can I set different text sizes for different apps?

Yes, but only for apps that have their own text size controls. Safari, News, and Books let you set text size independently. For system apps like Mail and Messages, they all use the same Text Size setting from Display & Brightness.

What's the difference between Text Size and Larger Accessibility Sizes?

Text Size is the standard slider that offers a moderate range of sizes. Larger Accessibility Sizes unlocks a second set of much larger options beyond what the standard slider provides. Turn on Larger Accessibility Sizes if the regular slider doesn't go large enough.

Does text size change affect my lock screen?

No. Text size settings only affect text within apps and system features like Mail and Messages. The lock screen, home screen, and app icons are not affected by text size changes.