Where to find font settings on your iPhone

Font size and style on your iPhone live in Settings under Accessibility, not in a general Display menu. This is because Apple groups text controls with other readability tools — larger text, bold text, and contrast adjustments all sit in the same place. Open Settings, tap Accessibility, then look for the section labeled Display & Text Size.

Inside Display & Text Size, you will see several options. The one that changes how large or small text appears across most apps is called Larger Accessibility Sizes or straightforward Text Size, depending on your iPhone model and iOS version. Below that, you may see toggles for Bold Text and Increase Contrast. These work together: you can make text larger, bolder, and higher contrast all at once, or use them separately.

Key Takeaways

  • Font size is controlled in Settings > Accessibility > Display & Text Size, not in the main Display settings.
  • The Text Size slider affects text in Mail, Messages, Notes, and most built-in apps, but not all third-party apps.
  • Bold Text and Increase Contrast are separate toggles that work alongside the size slider to improve readability.
  • Some apps like Safari and Chrome have their own font controls that override the system setting.
  • Dynamic Type, which is on by default, allows apps to respect your text size choice — turning it off breaks this feature.

Adjusting text size with the slider

Once you are in Display & Text Size, you will see a slider with a small letter A on the left and a large letter A on the right. Drag the slider to the right to make text larger, or to the left to make it smaller. As you move the slider, the sample text above it changes size so you can see the effect in real time.

This slider controls the base text size for most of Apple's built-in apps: Mail, Messages, Notes, Reminders, Calendar, and Stocks. It does not affect text in Safari, Maps, or the Home app — those apps have their own size controls. Third-party apps vary: some respect your system text size choice, and some ignore it entirely.

The slider has preset stops, so you cannot set text to every possible size. If the closest preset is still too small or too large, you can combine the slider with Bold Text or Increase Contrast to fine-tune readability without changing the actual size.

Using Bold Text and Increase Contrast together

Below the text size slider, you will find a toggle for Bold Text. Turn this on, and all system text becomes heavier and darker. This makes text easier to read without making it larger, which is useful if you want bigger text but your screen is already crowded. Bold Text affects the same apps as the size slider — Mail, Messages, Notes, and others — but not Safari or Maps.

The Increase Contrast toggle, just below Bold Text, makes text darker and backgrounds lighter or more saturated. This widens the visual gap between text and background, which helps if you have low vision or color blindness. You can turn on Bold Text alone, Increase Contrast alone, or both together. There is no downside to using both — they work independently and do not interfere with each other.

After you change either setting, you may need to close and reopen an app to see the change take effect. Mail and Messages usually update when ready, but some apps require a restart.

Changing font in Safari and web browsers

Safari does not use your system text size setting. Instead, it has its own control. Open Safari, load any webpage, tap the AA icon in the address bar (it appears on the left side), and you will see options to make text larger or smaller. This setting applies only to Safari and only to the current webpage — it does not carry over to other browsers or other websites.

If you use Chrome, Firefox, or another browser, each one has its own text size control, usually found in the app's settings or by pinching the screen to zoom. These browser-level controls are separate from your iPhone's system text size, so you may need to adjust them individually.

What Dynamic Type does and why it matters

Dynamic Type is a system feature that tells apps to respect your text size choice. It is on by default. When Dynamic Type is on, any app that is built to support it will automatically use the text size you set in Accessibility. When it is off, those apps ignore your setting and use their own default size.

You should leave Dynamic Type on unless an app is misbehaving — text appearing too large or too small despite your settings. To turn it off, go to Settings > Accessibility > Display & Text Size and toggle off Dynamic Type. If you do this, you will need to adjust text size inside each individual app instead of using the system setting.

Most Apple apps and many popular third-party apps support Dynamic Type. Older apps or apps that have not been updated in years may not, which is why you sometimes see text that does not respond to your system settings.

Resetting text size to default

If you have adjusted the text size slider and want to return it to the middle position, drag the slider until it aligns with the medium-sized A icon in the center. This is the default size Apple ships with. You can also turn off Bold Text and Increase Contrast by toggling them off individually.

There is no reset-all button for these settings, so you will need to adjust each one separately. If you have changed text size in Safari or another app, those changes are stored separately and will not be affected by resetting the system slider.

Frequently Asked Questions

Why does text look the same size even after I moved the slider?

The app you are looking at may not support Dynamic Type. Safari, Maps, and some third-party apps have their own text controls and ignore the system setting. Try opening Mail or Messages to confirm the slider is working, then look for a text size control inside the app that is not responding.

Can I change the actual font style, like from San Francisco to a different typeface?

No. iOS does not allow you to change the system font family. All text on your iPhone uses San Francisco, Apple's default font. You can only change the size, weight (bold), and contrast. Some apps let you choose a font within that app, but this does not affect system-wide text.

Does changing text size affect all apps?

No. The system text size slider affects Mail, Messages, Notes, Reminders, Calendar, and a few others. Safari, Maps, Chrome, and many third-party apps have their own controls. Check inside each app's settings or look for an AA icon or text size button.

What is the difference between text size and zoom?

Text size changes only the size of text. Zoom, found in Settings > Accessibility > Zoom, magnifies the entire screen including buttons, images, and text. Use text size for reading comfort and zoom when you need to see small details across the whole screen.

If I turn off Bold Text, will my regular text look thinner?

Yes. Bold Text makes text heavier and darker. When you turn it off, text returns to its normal weight. This does not affect the size — only the thickness of the letters themselves.