Where to find font settings on your iPhone

You can change how text looks on your iPhone in two main places: the system-wide settings that affect most apps, and individual app settings for apps like Mail or Notes. The fastest route is Settings > Display & Brightness > Text Size, which adjusts the size of text across your phone. For more control over font style and weight, go to Settings > Accessibility > Display & Text Size, where you'll find options for bold text and larger accessibility sizes.

Not all fonts on your iPhone can be changed to a different typeface — Apple's system apps use San Francisco, which is built into iOS. However, you can make text larger, bolder, or higher contrast, which changes how readable it is. Third-party apps like Notes, Mail, and Word often let you pick fonts within the app itself, separate from your system settings.

Key Takeaways

  • System-wide text size is controlled in Settings > Display & Brightness > Text Size, and this change affects most built-in apps when ready.
  • For accessibility options like bold text and higher contrast, go to Settings > Accessibility > Display & Text Size instead.
  • Third-party apps like Notes, Mail, and Word have their own font menus inside the app — look for a formatting or text style button.
  • Apple's built-in apps use San Francisco font and cannot be changed to a different typeface, but you can adjust size, weight, and contrast.

Adjusting text size across your whole phone

Open Settings and tap Display & Brightness. Scroll down to Text Size and 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 shows you how your change will look.

This setting affects Mail, Messages, Calendar, Reminders, and most other built-in apps. The change takes effect when ready — you don't need to close and reopen apps. If you want text even larger than the slider allows, you'll need to use the accessibility settings instead, which can go up to much bigger sizes.

Making text bold and increasing contrast

Go to Settings > Accessibility > Display & Text Size. Near the top, toggle on Bold Text. Your phone will restart, and when it comes back on, all text across the system will appear thicker and darker. This works in every app, including Mail, Messages, and Safari.

In the same menu, you can also turn on Increase Contrast to make text stand out more against backgrounds, and Reduce Transparency to remove the frosted-glass effect from menus and panels. These three options work together — you can use all of them at once. Each change takes effect after your phone restarts, which takes about 30 seconds.

Changing fonts in Notes, Mail, and other apps

Open the app and start typing or editing text. Look for a formatting button — in Notes, it's the "Aa" icon at the top of the screen. Tap it and you'll see options for font style (like Helvetica, Georgia, or Courier), size, and color. In Mail, tap the arrow next to the font name in the compose window to see available typefaces.

Not every app offers font choices. Calendar, Reminders, and Messages don't have built-in font menus — they follow your system text size setting instead. If you use a third-party app like Microsoft Word or Google Docs, open the app and look for a text formatting menu, usually marked with an "A" or three horizontal lines.

Using larger accessibility font sizes

If the standard text size slider isn't large enough, go to Settings > Accessibility > Display & Text Size and turn on Larger Accessibility Sizes. This unlocks a second slider below the regular text size slider, allowing you to go much larger — up to 188% of the default size in some cases.

These extra-large sizes work in most built-in apps and many third-party apps, but not all. Mail, Messages, and Safari support them well. Some older or simpler apps may not respond to this setting. If you turn on larger accessibility sizes and an app's text doesn't change, that app may not support the feature.

Changing font in Safari and web pages

When you're reading a web page in Safari, pinch outward with two fingers to zoom in and make text larger. This is temporary and only affects that page — when you leave and come back, the page returns to normal size. To make text larger on every website you visit, go to Settings > Safari > Page Zoom and move the slider to the right. This sets a default zoom level for all websites.

Some websites also let you change fonts through their own settings. Look for a menu or gear icon on the page itself. If a website has a dark mode or reading mode, switching to it often makes text easier to read and may offer font choices as well.

Troubleshooting font changes that don't work

If you changed your text size and it didn't take effect, force-close the app and reopen 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 away. Then tap the app again to reopen it. If you turned on Bold Text and your phone is still restarting, wait a few minutes — the restart can take longer than expected.

If text in a specific app still won't change, that app may not support the system text size setting. Check the app's own settings menu — look for a gear icon or "Settings" option inside the app. Some apps override system settings and require you to change fonts within the app itself. If an app is very old or no longer updated, it may not respond to any font changes at all.

Frequently Asked Questions

Can I change the font to something other than San Francisco?

Apple's built-in apps like Mail, Messages, and Calendar use San Francisco and cannot be changed to a different typeface. Third-party apps like Notes, Word, and Google Docs do offer font choices — open the app and look for a formatting menu. You can also install custom fonts through some apps, but this only works within that specific app.

Will changing my text size affect all my apps?

The system text size setting in Display & Brightness affects most built-in apps and many third-party apps, but not all. Older apps or apps with custom text rendering may ignore this setting. If an app doesn't respond, check its own settings menu for font options.

What's the difference between text size and accessibility sizes?

The standard text size slider in Display & Brightness goes up to about 130% of normal. Larger Accessibility Sizes in Settings > Accessibility > Display & Text Size unlocks a second slider that can go up to 188%. Use the standard slider first, then turn on accessibility sizes if you need text even larger.

Does bold text use more battery?

No, turning on bold text does not drain your battery faster. It only changes how text is rendered on screen and has no measurable effect on battery life.

Can I change fonts on my lock screen or home screen?

No, the lock screen and home screen app names always use San Francisco and cannot be customized. You can only change the text size through system settings, which affects how app names appear on your home screen.