Where to find font settings on your iPhone

Font changes on iPhone happen in two places: the system-wide text size in Settings, or the font style in specific apps. Apple does not let you change the actual typeface across the whole phone the way you can on Android, but you can make text larger or smaller everywhere, and some apps let you pick their own fonts.

Start in Settings > Display & Brightness > Text Size. This slider adjusts how large letters appear in Mail, Messages, Notes, and most built-in apps. Move it left to shrink text, right to enlarge it. The change takes effect when ready.

If you need text even larger, go to Settings > Accessibility > Display & Text Size > Larger Accessibility Sizes. This unlocks a second, bigger range of sizes beyond what the standard Text Size slider offers. Both sliders work together — you can use one or both.

Key Takeaways

  • The Text Size slider in Settings > Display & Brightness changes font size across Mail, Messages, Notes, and most system apps when ready.
  • Larger Accessibility Sizes in Settings > Accessibility > Display & Text Size gives you even bigger text options if the standard slider is not large enough.
  • Individual apps like Safari, News, and Books have their own font size controls inside the app itself, separate from system settings.
  • iPhone does not allow you to change the typeface (the actual font family) system-wide, but some apps let you pick their own fonts in their settings.
  • Bold text and high contrast options in Accessibility can make text easier to read without changing size.

Changing text size in Mail, Messages, and Notes

These three apps pull their text size directly from the system Text Size setting. Once you adjust the slider in Settings > Display & Brightness > Text Size, the change appears in all three the next time you open them or refresh the view.

If you want to test the size before committing, open one of these apps and go back to Settings to move the slider. You do not need to close the app — just switch back and forth to see the text get bigger or smaller in real time.

Font size in Safari, News, and Books

Safari, News, and Books have their own font controls that override the system setting. In Safari, tap the text size icon (usually marked with a small and large A) in the address bar or menu, then choose your size. In News, open an article and tap the text size button in the top right. In Books, tap the font icon (usually marked "Aa") and adjust the slider.

These app-specific controls let you read comfortably in each app without changing the system-wide text size. If you prefer a certain size in Safari but a different size in Books, you can set them independently.

Using accessibility options to improve readability

If larger text alone is not enough, Settings > Accessibility > Display & Text Size offers two more tools: Bold Text and Increase Contrast. Bold Text makes every letter slightly thicker across the system, which many people find easier to read than size alone. Increase Contrast darkens text and backgrounds to create sharper separation.

Both of these work alongside the text size sliders. You can turn on Bold Text, set a larger size, and enable Increase Contrast all at once. Your phone will restart when you turn on Bold Text, so plan for that brief interruption.

Font options in third-party apps

Apps like Kindle, Medium, Pocket, and others often include their own font menus. Look for a text icon or "Settings" button within the app itself — it is usually in the reading view or article view, not in the main app settings. Tap it to see what fonts and sizes that app offers.

These app fonts do not affect the system font or other apps. Each app controls only its own display. If an app does not have a visible font button, check its main settings menu under a "Reading" or "Display" section.

Why you cannot change the system font typeface

iOS does not allow users to replace the system typeface (the actual font family, like switching from San Francisco to Georgia). Apple uses San Francisco as the default across the entire system, and third-party apps must use it or their own custom fonts — they cannot override it system-wide.

This is different from Android, where you can often change the system font in settings. On iPhone, your only option is to adjust size, weight (bold), and contrast. If a specific app offers font choices, you can use those within that app only.

Frequently Asked Questions

Can I make text bigger on my lock screen or home screen?

The system Text Size slider does not affect the lock screen or home screen. You can only change the size of app icons (by using different home screen layouts) or the text in apps themselves. Accessibility text size does not explore to these areas either.

Will changing text size affect how apps look?

Most apps will reflow their layout to fit larger text — buttons move, spacing adjusts, and content shifts. Some older or poorly designed apps may not adapt well and could look cramped or broken. Test the size in the apps you use most before settling on a permanent change.

How do I undo text size changes?

Go back to Settings > Display & Brightness > Text Size and move the slider to the middle (the default position). If you also turned on Larger Accessibility Sizes or Bold Text, turn those off in Settings > Accessibility > Display & Text Size.

Can I use different fonts in different apps?

Yes, if the app offers font controls. Safari, Books, News, Kindle, and many reading apps let you pick fonts within the app. The system text size still applies to all apps, but individual apps can add their own font choices on top of that.

Does changing font size use more battery?

No. Text size changes do not affect battery life. Bold Text and Increase Contrast also have no meaningful impact on battery, though any change that makes your screen brighter could use slightly more power.