Display and text accessibility features for vision
Built-in accessibility features for vision on iPhone and iPad that let you change the weight, size, and darkness of text to make it easier to read on your screen.
On an Android device, you can also adjust the appearance of text using accessibility features.
On iPhone or iPad: Go to Settings > Accessibility > Display & Text Size, then choose your settings. See Make iPhone text easier to read with accessibility features in the iPhone User Guide.
To adjust only text size, go to Settings > Display & Brightness > Text Size, then drag the slider.
On an Android device: Go to Settings > Accessibility > Vision enhancements, then choose your settings. See the Android Help article about changing text and display settings on the Google support site.
Note: Interface options may vary on different versions of Android and on different Android devices.