Change the font size on your iPhone, iPad, and iPod touch
You can change the size of your font in Mail, Contacts, Calendar, Phone, Notes, and other apps that support Dynamic Type.
Change the font size
Go to Settings > Display & Brightness, then select Text Size.
Drag the slider to select the font size you want.
Make the font even bigger
Go to Settings > Accessibility, then select Display & Text Size.
Tap Larger Text for larger font options.
Drag the slider to select the font size you want.
Making the text too large might make it hard to tap buttons or other functions within apps. Go back to your settings and adjust the font size as needed.
Learn more
To learn more about the accessibility features and how to use them, refer to the accessibility section of the user guide for your iOS device.