Three ways to change text size on your iPhone

You can adjust text size on your iPhone in three different places, depending on which app or part of your phone you want to change. The easiest method is using the built-in Display & Brightness settings, which makes text larger across most of your phone at once. If you want to change text in just one app, you can use Dynamic Type to resize it there. For the most control, you can zoom in on your entire screen using the Accessibility Zoom feature.

Each method works differently and affects different parts of your phone. Some changes explore everywhere; others only work in specific apps. The method you choose depends on whether you want to resize text system-wide or just in one place.

Key Takeaways

  • Go to Settings, then Display & Brightness, then Text Size to make text larger or smaller across most of your iPhone in one step.
  • Use Accessibility Zoom (Settings > Accessibility > Zoom) to magnify your entire screen, which works in every app but uses more battery.
  • Individual apps like Mail, Messages, and Safari have their own text size controls that override the system setting.
  • The text size slider in Display & Brightness works best for everyday reading, while Accessibility Zoom is better for people with low vision.

Changing text size in Display & Brightness settings

The fastest way to make text bigger or smaller across your iPhone is through the Display & Brightness menu. Open Settings, tap Display & Brightness, then 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 left to make text smaller or right to make text larger. The preview text above the slider shows you how the change will look.

This method affects text in Mail, Messages, Notes, Reminders, Calendar, and most other built-in Apple apps. It does not change text in web browsers like Safari or in third-party apps like Facebook or Gmail, which have their own text size controls. When you adjust the slider, the change takes effect when ready, so you can see the result right away.

Resizing text in individual apps

Many apps let you change text size just within that app, without affecting the rest of your phone. In Safari, open a webpage, tap the menu icon (three horizontal lines) at the bottom right, then tap the "A" icon and choose a text size. In Mail, open a message, tap the three dots at the bottom right, then tap Text Size and choose your preference.

Messages, Notes, and some other Apple apps do not have their own text size controls — they use whatever size you set in Display & Brightness. Third-party apps like Kindle, Medium, or news apps often have their own text controls buried in settings or in a menu within the app itself. Check the app's settings or look for an "A" icon to find the text size option.

Using Accessibility Zoom to magnify your entire screen

If you need to make everything on your screen larger — not just text, but buttons, icons, and images too — use Accessibility Zoom. Go to Settings, tap Accessibility, tap Zoom, then turn on the toggle. Your screen will zoom in to 200 percent by default, making everything twice as large.

Once Zoom is on, you can adjust the zoom level by going back to Settings > Accessibility > Zoom and dragging the Maximum Zoom Level slider. You can zoom between 100 and 500 percent. When Zoom is active, you navigate by tapping and dragging around the screen. Zoom works in every app and every part of your iPhone, but it uses more battery power and can make some tasks slower because you have to pan around to see the full screen.

Using Bold Text for easier reading

If you want text to stand out more without making it larger, turn on Bold Text. Go to Settings, tap Display & Brightness, then turn on Bold Text. Your iPhone will restart, and when it comes back on, text throughout your phone will appear darker and thicker. This works alongside the Text Size slider — you can use both together.

Bold Text affects the same apps as the Text Size setting: Mail, Messages, Notes, Calendar, and most built-in apps. It does not make text larger, only darker and heavier, so it is useful if you find regular text hard to read but do not need it to be bigger. The change takes effect after your phone restarts, so you will see a loading screen for a few seconds.

Combining text size changes with other accessibility features

You can use text size adjustments together with other iPhone features to make reading easier. Increase Text Size, turn on Bold Text, and enable High Contrast in Settings > Accessibility > Display & Text Size to make text stand out the most. You can also turn on Dark Mode (Settings > Display & Brightness > Dark) to reduce glare and eye strain, which many people find helps with reading comfort.

If you use reading apps like Apple Books or Kindle, those apps have their own text controls separate from your iPhone settings. Open the app, look for a text or font icon (usually an "A" or book icon), and adjust the size there. Some reading apps also let you change the font, line spacing, and background color, which can make a big difference in how straightforward text is to read for long periods.

Frequently Asked Questions

Will changing text size in Display & Brightness affect text in Safari and Chrome?

No. Safari and Chrome have their own text size controls. In Safari, tap the menu icon at the bottom right and tap the "A" icon to resize. In Chrome, tap the three dots at the top right, tap Settings, then tap Font Size. Changing the system text size in Display & Brightness will not affect web browsers.

Can I set different text sizes for different apps?

Yes, if the app has its own text size control. Mail, Safari, and some reading apps let you set text size within that app only. The system text size in Display & Brightness applies to most built-in apps, but individual apps can override it with their own settings.

Does Accessibility Zoom work with all apps?

Yes, Accessibility Zoom magnifies everything on your screen in every app. However, some apps may not work smoothly when zoomed because they were not designed for magnification. You may need to pan around the screen to see everything, which can make navigation slower.

Will Bold Text make my battery drain faster?

No. Bold Text only changes how text is displayed and does not use extra battery power. Accessibility Zoom uses more battery because your phone has to constantly render a magnified view, but Bold Text is a straightforward display change with no battery impact.

Can I undo text size changes if I change my mind?

Yes. Go back to Settings > Display & Brightness > Text Size and drag the slider back to the middle (the default position). For Accessibility Zoom, go to Settings > Accessibility > Zoom and turn off the toggle. Any changes you make can be reversed at any time.