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Customize the text size and zoom setting on iPhone
You can increase the size of the text on your iPhone display, make the text bold, and magnify the screen with Display Zoom.
Increase the text size on iPhone
Go to Settings > Display & Brightness.
Tap Text Size.
Drag the slider left or right to change the text size.
Make the text bold on iPhone
Go to Settings > Display & Brightness.
Turn on Bold Text.
Magnify the entire iPhone screen
On supported models, you can magnify the iPhone screen with Display Zoom.
Go to Settings > Display & Brightness.
Tap Display Zoom, then tap Larger Text.
Tap Done, then tap Use Zoomed.