Where to find font settings on your iPhone
You can change how text looks on your iPhone in two places: the system-wide settings that affect most apps, and individual app settings for apps that let you customize their own display. The system settings control the size of text in Mail, Messages, Settings, and many other built-in apps. Individual apps like Notes, Books, or news readers often have their own font controls inside the app itself.
The fastest route is Settings > Display & Brightness > Text Size, which opens a slider that makes text larger or smaller across your phone. This does not change the font style — it only changes the size. If you want to change the actual typeface (like switching from the default San Francisco font to something else), that option is more limited on iPhone and depends on which app you are using.
Key Takeaways
- Text Size in Display & Brightness settings changes font size system-wide for Mail, Messages, Settings, and other built-in apps.
- Most iPhone apps do not let you change the typeface itself — only the size — because Apple controls the system fonts.
- Individual apps like Notes, Books, and Mail have their own font controls inside the app that override the system setting.
- Accessibility settings like Larger Accessibility Sizes and Bold Text offer additional ways to make text easier to read.
How to adjust text size in Settings
Open Settings and tap Display & Brightness. Scroll down until you see Text Size. Tap it to open a slider with a small letter A on the left and a large letter A on the right. Drag the slider left to make text smaller or right to make text larger. The preview text in the middle of the screen updates as you move the slider so you can see the change before you confirm it.
This setting affects text in Mail, Messages, Notes, Reminders, Calendar, Stocks, and the Settings app itself. It does not affect text inside web browsers, social media apps, or other third-party apps — those apps control their own text size. When you finish adjusting, tap the back arrow or swipe left to return to Display & Brightness. The change takes effect when ready.
Changing font size within individual apps
Many apps have their own text size controls that override the system setting. In Mail, open any email, tap the three dots in the bottom right, and look for an option like "Text Size" or a small-to-large A icon. In Notes, open a note and tap the three dots, then select Text. In Books, tap the middle of the page to bring up controls, then tap the font icon (usually looks like two A's) to adjust size and typeface.
These app-level controls are useful when you want text larger in one app but not everywhere on your phone. If an app does not show a text size option, it means the developer did not build one in — you can only use the system Text Size setting in that case. Some apps like Safari and Chrome have their own zoom features separate from text size, which let you enlarge everything on the page rather than just the words.
Using Accessibility settings for easier reading
If the standard Text Size slider is not enough, iPhone has stronger accessibility options. Go to Settings > Accessibility > Display & Text Size. Here you will find Larger Accessibility Sizes, which gives you many more size options than the regular Text Size slider — you can make text much larger if you need it. You will also find Bold Text, which makes all text on your phone thicker and darker, and Increase Contrast, which makes text stand out more from the background.
These settings work together. You can turn on Bold Text and Larger Accessibility Sizes at the same time. They affect the same apps as the regular Text Size setting, plus some additional system elements like button labels and menu text. After you turn on any of these options, your iPhone restarts to explore the change. This takes about 30 seconds.
Why you cannot change the typeface on most apps
Apple restricts which fonts apps can use on iPhone. The system font is called San Francisco, and most built-in apps and many third-party apps use it. Unlike on a computer, you cannot install new fonts system-wide or tell Mail to use a different typeface. This is by design — Apple says it keeps the interface consistent and readable across all apps.
A few apps do let you pick from a small set of fonts. Notes lets you choose between San Francisco, New York, Menlo, Courier, and Georgia. Books lets you pick from several serif and sans-serif options. But these are exceptions. If you need a specific typeface for work or accessibility reasons, check the app's own settings first — tap the three dots or look for a gear icon inside the app. If the app does not offer font choices, that option is not available for that app on iPhone.
Changing font in Messages and Mail
Messages does not have a built-in font picker, but you can make text larger using the system Text Size setting or by using Larger Accessibility Sizes. The text you type will appear in whatever size you set, and the person receiving your message will see it in their own font settings, not yours — the actual message is just plain text.
Mail works the same way. You can adjust text size in Settings > Display & Brightness > Text Size, or open an email and use the app's own text size controls if available. When you compose a new email, the text appears in the size you have set, but the recipient sees it in their own Mail app's font settings. If you need to send text in a specific style or format, you would need to create it in a different app (like Pages or Notes) and paste it into Mail, but even then the recipient's Mail app may override your formatting.
Frequently Asked Questions
Will changing text size make my battery drain faster?
No. Changing text size does not affect battery life. The phone is displaying the same content, just larger or smaller. Accessibility features like Bold Text use slightly more power because the screen has to render thicker lines, but the difference is not noticeable in daily use.
Can I change the font color on my iPhone?
Not system-wide. Individual apps like Notes and Mail may let you change text color within that app, but there is no setting to change the color of text everywhere on your phone. Check the app's own settings by tapping the three dots or looking for a formatting menu.
What happens to text size when I update iOS?
Your text size setting stays the same. When you update to a new version of iOS, your Display & Brightness settings and Accessibility settings are preserved. You will not have to reset them.
Why does text look different in Safari than in Mail?
Safari and Mail use different rendering engines. Safari respects the system Text Size setting, but web pages can also have their own font sizes built in. Mail uses the system setting more strictly. If text looks too small in Safari, you can pinch to zoom the page or use Safari's text size controls by tapping the AA icon in the address bar.
Can I make text larger just for one app without changing it everywhere?
Yes. Open that app and look for its own text size controls — usually three dots, a gear icon, or an A icon. Adjust the size there, and it will only affect that app. Your system Text Size setting will stay the same for other apps.