Where to find the font settings on your iPhone
You can change the font size and style on your iPhone through the Settings app. The controls are split between two places: Display & Brightness handles text size across most apps, while Accessibility offers additional font options and the ability to change fonts in specific apps that support it.
Apple does not let you change the system font (the typeface itself) across your entire phone the way you can on some Android devices. What you can do is adjust how large the text appears, make text bolder, and in some apps—like Mail, Notes, and Messages—switch to a different typeface altogether.
Key Takeaways
- Text size across most apps is controlled in Settings > Display & Brightness > Text Size, using a slider to make text larger or smaller.
- You can make all text bolder system-wide by going to Settings > Accessibility > Display & Text Size and turning on Bold Text.
- Some built-in apps like Mail, Notes, and Messages let you pick a different font from their own settings menus, separate from the system-wide controls.
- Third-party apps can have their own font controls in their individual settings, so check each app's preferences if the system settings do not affect it.
- If text is hard to read, Dynamic Type (in Accessibility settings) automatically scales text in compatible apps when you change your system text size.
Adjusting text size across your iPhone
Open Settings and tap Display & Brightness. Scroll down and 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 to the size you want. The preview text above the slider updates as you move it, so you can see the change before you confirm.
This setting affects text in Mail, Messages, Notes, Contacts, Calendar, and most other built-in apps. It does not affect text in apps that have their own font controls, and it does not change the size of icons or buttons—only readable text.
If you want to make text even larger, you can also turn on Larger Accessibility Sizes in Settings > Accessibility > Display & Text Size. This unlocks even bigger size options beyond what the standard Text Size slider offers.
Making text bolder throughout your phone
Go to Settings > Accessibility > Display & Text Size. Toggle on Bold Text. Your iPhone will restart, and when it comes back on, all text across the system will appear bolder and heavier.
This works system-wide and affects nearly every app. If you find the change too heavy after restarting, you can turn it back off the same way. Some people find bold text easier to read; others find it makes the screen feel crowded. It is a personal preference.
Changing fonts in Mail, Notes, and Messages
A few built-in apps let you pick a different typeface. In Mail, open a new message, tap in the body, then tap the arrow next to the formatting options (usually at the bottom of the keyboard). Tap Aa and select a font from the list. Your choice applies to that message only.
In Notes, open a note and tap the three dots (or the formatting button). Tap Text and choose a font. This sets the font for new text you type in that note going forward, but does not change text you have already written.
In Messages, you can use effects and formatting, but you cannot change the typeface of the message text itself—only the size and weight through the system settings.
Font controls in third-party apps
Apps you read from the App Store may have their own font settings. Open the app, look for a Settings or Preferences menu (often a gear icon), and search for options labeled Font, Text, or Display. Some reading apps like Kindle, Apple Books, and Pocket let you choose between serif and sans-serif fonts, adjust line spacing, and change text color.
If an app does not have its own font menu, it will use whatever text size you set in Display & Brightness. Some apps ignore the system text size entirely and have their own controls—there is no universal standard.
Using Dynamic Type for automatic text scaling
Dynamic Type is a feature that makes compatible apps automatically adjust their text size when you change your system text size. Most Apple apps and many third-party apps support it. You do not need to turn it on—it works by default in apps that support it.
If an app does not seem to respond when you change your text size, it either does not support Dynamic Type or has its own separate font controls. Check the app's settings first before assuming the system setting is broken.
Why some apps do not respond to your font changes
Not every app respects the system text size setting. Games, social media apps, and some older apps often ignore it completely. This is a choice by the app developer, not a limitation of your iPhone.
If an app has its own font or text size control, use that instead. If it does not have one and the text is too small or too large, you have two options: contact the app developer to request the feature, or look for a similar app that does support system text size.
Frequently Asked Questions
Can I change the actual font style (typeface) on my whole iPhone?
No. Apple does not let you change the system typeface across your entire phone. You can only change text size and weight system-wide. Individual apps like Mail and Notes have their own font pickers, but they do not affect the rest of your phone.
Will changing the text size make everything on my screen bigger?
No. The text size slider only affects readable text in compatible apps. Icons, buttons, and the layout of your home screen stay the same. If you need everything larger, turn on Zoom in Settings > Accessibility > Zoom, which magnifies the entire screen.
What is the difference between text size and bold text?
Text size controls how tall the letters are. Bold text makes the letters thicker and heavier. You can use both at the same time—make text larger and bolder together for maximum readability.
Why did my text get smaller after I restarted my phone?
If you turned on Bold Text, your iPhone restarts automatically. When it comes back on, the text will look different because it is now bold. If text appears smaller, you may have accidentally moved the text size slider. Check Settings > Display & Brightness > Text Size to confirm your preference.
Do font changes work in web browsers?
Partially. Safari respects your system text size in most web pages, but websites can override this with their own font sizes. Some websites ignore your settings entirely. If a website is hard to read, try pinching to zoom in, or use Safari's Reader mode (the lines icon in the address bar) to reformat the page.