The fastest way to make text bigger or smaller on your iPhone
You can change the font size on your iPhone in two main ways: adjust the text size for most apps at once, or zoom in on the entire screen. The quickest method is to go to Settings > Display & Brightness > Text Size and drag the slider left to make text smaller or right to make it larger. This affects Mail, Messages, Notes, and most other built-in apps when ready.
If you want to make everything on your screen bigger—not just text—you can use the Display Zoom feature instead, which enlarges the whole interface. Both methods work without restarting your phone, and you can switch between them or use them together depending on what you need.
Key Takeaways
- The Text Size slider in Settings > Display & Brightness > Text Size is the fastest way to change font size in most apps.
- Display Zoom in Settings > Display & Brightness > Display Zoom enlarges the entire screen, including icons and buttons, not just text.
- Some apps like Safari and web browsers have their own text size controls that override the system setting.
- Accessibility features like Larger Accessibility Sizes let you make text even bigger if the standard Text Size slider is not enough.
Using the Text Size slider for most apps
Open Settings on your home screen. Scroll down and tap Display & Brightness. Look for Text Size and tap it. You will see a slider with a small "A" on the left and a large "A" on the right, along with a preview of how your text will look.
Drag the slider to the right to increase text size or to the left to decrease it. The preview updates as you move the slider so you can see the change before you confirm it. When you are satisfied, tap the back arrow or swipe back to exit. The new text size takes effect when ready in Mail, Messages, Notes, Calendar, Reminders, and most other Apple apps.
Using Display Zoom to enlarge the entire screen
If you want to make icons, buttons, and the entire interface larger instead of just text, use Display Zoom. Go to Settings > Display & Brightness and tap Display Zoom. You will see two options: Standard (the default) and Zoomed.
Tap Zoomed to see a preview of how your screen will look with everything enlarged. If you like it, tap Set at the bottom. Your iPhone will restart, and when it comes back on, all elements on the screen will be larger. You can switch back to Standard the same way if you change your mind.
Changing text size in Safari and web browsers
Safari and other web browsers often have their own text size controls that work independently of your system settings. In Safari, open a webpage and tap the aA button in the address bar at the top. A menu will appear with options to increase or decrease text size on that page.
These changes explore only to the current webpage and may not carry over to other sites or other apps. If you want a permanent change to how text looks in Safari across all websites, you can adjust the system Text Size setting, but individual page controls will override it.
Using Larger Accessibility Sizes for maximum text enlargement
If the standard Text Size slider does not make text large enough, your iPhone has an accessibility feature called Larger Accessibility Sizes. Go to Settings > Accessibility > Display & Text Size and turn on Larger Accessibility Sizes. A new slider will appear that lets you increase text size far beyond the standard maximum.
This feature works in most apps and is designed for people who need significantly larger text. Once you turn it on, you can use the slider below it to set your preferred size. The change takes effect when ready, and you can adjust it at any time by returning to the same menu.
Why some apps do not respond to your text size changes
Third-party apps—those made by companies other than Apple—do not always respect your system text size setting. Some apps have their own built-in text size controls that you need to adjust separately. Check the app's settings menu to see if there is a text size or font size option.
If an app does not have its own text size control and does not respond to your system setting, you can use Display Zoom instead, which enlarges everything on the screen including that app. Alternatively, you can pinch and zoom on the screen itself in many apps to temporarily enlarge content, though this does not change the default size.
Reverting to default text size
To return to the original text size, go back to Settings > Display & Brightness > Text Size and drag the slider to the middle position. This is the default setting that Apple ships with. If you turned on Larger Accessibility Sizes, you can turn it off the same way you turned it on: Settings > Accessibility > Display & Text Size > toggle off Larger Accessibility Sizes.
If you switched to Display Zoom, go to Settings > Display & Brightness > Display Zoom and select Standard. Your phone will restart and return to the standard layout.
Frequently Asked Questions
Can I change font size in just one app?
Most built-in Apple apps use your system text size setting, so you cannot change the size in just one app from Settings. However, some apps like Safari have their own text size controls within the app itself. For third-party apps, check their individual settings menu to see if they offer a text size option.
Will changing text size affect my battery life?
No. Changing text size does not use more or less battery power. Your iPhone's battery life depends on screen brightness, how often you use it, and which apps are running in the background—not on the size of the text you are reading.
What is the difference between Text Size and Display Zoom?
Text Size makes only the text larger in most apps. Display Zoom makes everything larger—text, icons, buttons, and the entire interface. Use Text Size if you want to keep icons the same size, or Display Zoom if you want the whole screen enlarged.
Can I make text smaller than the minimum on the Text Size slider?
The Text Size slider has a minimum and maximum built in. If you want text even smaller, most apps do not offer that option through Settings. Some web browsers let you zoom out on individual pages, but there is no system-wide setting to go below the Text Size minimum.
Does changing text size on my iPhone affect my iPad or Mac?
No. Text size settings are specific to each device. If you change the text size on your iPhone, it does not change on your iPad, Mac, or other Apple devices. You need to adjust the text size separately on each device if you want them to match.