Sure, you can adjust the text size for your entire iPhone, but what if it's just one or two apps that are hard to read? You can decrease or increase text size for one app or several instead of changing font size across all apps! Here's how to adjust font size in iPhone apps, just one, or as many as you need!
Why You'll Love This Tip:
- Stop squinting to see tiny print in one app—adjust the font size in iPhone and iPad apps on an app-by-app basis.
- Adjusting text size on iPhone as a whole can make some app text too big or too small. Change the iPhone default text size for any app with this quick adjustment slider.
How to Add Font Size to Control Center
System Requirements
This tip was performed on an iPhone 16 running iOS 18.5. Find out how to update to the latest version of iOS.
How do you change the font size on an iPhone or iPad for individual apps? Before you can adjust text size on iPhone for each app, you'll need to add the Text Size adjustment feature to the Control Center on your iPhone. Here's how to do that; next, learn how to change font size in apps!
- Open the Control Center on your iPhone or iPad.
- Touch and hold a blank spot in the Control Center.
- Now that the Control Center is in Edit mode, tap Add a Control.
- Tap Text Size.
- You'll see the Text Size control in your Control Center.
- Tap a blank spot in the Control Center again, and you'll exit Edit Mode. Now, whenever you open your Control Center, you'll see the Text Size control.
Once you've completed these steps, you can move on to the next section to learn how to increase text size on iPhone and iPad in apps.

How to Change Text Size on iPhone for Individual Apps
Now that you have access to Text Size in the Control Center on your iPhone, let's learn how to change text size on iPhone for each app that's hard to read.
- First, open the app you want to change text size in on your iPhone or iPad. Here, I want to change the font size in Messenger on my iPhone.
- Open the Control Center on your iPhone or iPad.
- Touch and hold Text Size control, then tap Messenger Only (name will change depending on which app you have open) or All Apps, to choose whether to increase font size just the app you're using, or all apps.
- Use your finger to move the slider up or down to change font size for the app. The more white bars, the larger the font size.
- You'll see a percentage increase or decrease in the size of the font at the top of your screen.
- When you're finished, tap a blank part of the screen to exit, and you'll see the new font size in the app.
Now you know how to change text size for iPhone apps individually! Just repeat these steps while in each app to customize the text on an app-by-app basis. Next, learn how to increase font size on iPad.
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