Display and appearance

Text Size

Most people call this making text bigger or smaller.

One slider changes text size across the system and every app that uses Dynamic Type, and Accessibility offers larger sizes still.

Available

This setting is present on your iPhone.

We have this path on file but have not yet confirmed it against an official source.

Where to find it - iOS 15 and later

Settings
Accessibility
Display & Text Size
Larger Text

Use this route for sizes beyond the standard slider.

What it does

The Display and Brightness version covers the normal range. The Accessibility version adds much larger sizes and can be applied to individual apps instead of everywhere.

What changes

When it is on

Text grows throughout the system. Layouts reflow, and some screens fit less at once.

When it is off

Text returns to the standard size.

Should you turn it on?

Good reasons to turn it on

Reading without glasses becomes possible again.
Bold Text alongside it makes a large further difference.

Good reasons to turn it off

Very large text means more scrolling and fewer items per screen.
A few apps handle large sizes badly and clip their own labels.

Battery

No real change

Privacy

No real change

Performance

No real change

Cellular data

No real change

Storage

No real change

Out of the box: The standard size in the middle of the range.

Questions people actually ask

How do I make text bigger on my iPhone?: Settings, then Display and Brightness, then Text Size. For larger sizes use Accessibility, then Display and Text Size, then Larger Text.
Can I make text bigger in just one app?: Yes. Accessibility, then Per-App Settings, then add the app and set its text size.

If it is not working

For sizes beyond the normal slider, use Accessibility, then Display and Text Size, then Larger Text.
Per-App Settings under Accessibility lets you enlarge text in one app only.
An app that ignores the setting has not adopted Dynamic Type.

Related settings