Where to find the font size controls
Font size on an iPhone lives in Settings under Accessibility, not in the main Display settings where you might expect it. Open Settings, tap Accessibility, then look for Display & Text Size. This section controls how large the text appears across most of your apps and system screens.
Apple separates font controls this way because text size is often tied to accessibility needs — people with vision loss or reading difficulties use these same controls. That means the options are robust and work consistently across the system.
Key Takeaways
- Font size adjustments live in Settings > Accessibility > Display & Text Size, not in the main Display settings.
- The Larger Accessibility Sizes slider lets you increase text far beyond the standard range, up to the largest readable size your phone can display.
- Some apps like Mail and Messages respect system-wide font changes, while others like Notes and third-party apps may have their own separate text size controls.
- You can also use the system-wide zoom feature to enlarge everything on screen at once, which works differently than font size alone.
Using the standard font size slider
In Display & Text Size, you will see a slider labeled Text Size with a small "A" on the left and a large "A" on the right. Drag this slider to the right to make text larger across Mail, Messages, Notes, Reminders, and other built-in apps. The change takes effect when ready — you can see the preview text update as you move the slider.
This slider covers the standard range most people need. If you find yourself at the far right and text still feels too small, you have a second option: the Larger Accessibility Sizes toggle directly below it. Turn this on to unlock an extended range that goes much further.
Enabling Larger Accessibility Sizes for maximum text
When you toggle on Larger Accessibility Sizes, the Text Size slider expands to include much larger options. This is useful if you have vision loss or straightforward prefer significantly larger text. The slider now goes to sizes that would be impractical for most people but are essential for others.
Be aware that at the largest sizes, some apps may not display perfectly — buttons might shift, text might wrap awkwardly, or layouts might break. This is rare with Apple's own apps but more common in third-party applications. If an app becomes hard to use at your chosen size, you can always lower it or use the zoom feature instead.
Checking which apps respect your font size choice
Built-in Apple apps like Mail, Messages, Reminders, and Calendar respect your system font size setting. However, many third-party apps — including Notes, some email clients, and social media apps — have their own text size controls that override the system setting. You may need to adjust text size separately within those apps.
To find an app's text size control, look in that app's own settings menu. Common locations are the app's main settings screen, a menu accessed by tapping your profile picture, or a gear icon. Some apps put text size in a "Display" or "Appearance" submenu. If you cannot find it, the app may not offer a separate control and will use whatever system size you have set.
Using zoom as an alternative to font size
If you want to enlarge everything on your screen — not just text, but icons, buttons, and images too — use the Zoom feature instead. This is also in Accessibility, but under Zoom rather than Display & Text Size. Zoom magnifies the entire screen, which is different from making text larger alone.
Zoom works by letting you pinch to zoom in and out, similar to zooming a photo. It can be useful if you want larger text but also want larger buttons and interface elements. The tradeoff is that you will see less of the screen at once and may need to pan around to see full content. Try both approaches — font size alone and zoom — to see which feels more natural for how you use your phone.
Adjusting font size for specific situations
You might want different font sizes for different times. Some people use a smaller size during the day when lighting is good and increase it in the evening when their eyes are tired. You can change the slider in seconds whenever you need to, so there is no reason to stick with one size all day.
If you find yourself changing it frequently, consider whether zoom or a screen reader might work better for your situation. The Speak Screen feature (also in Accessibility) can read text aloud, which removes the need to see small text at all. Experiment with the different tools — font size, zoom, and voice — to find what works best for your eyes and your routine.
Frequently Asked Questions
Does changing font size affect all apps?
System font size affects Apple's built-in apps consistently, but third-party apps vary. Some respect the system setting, others ignore it completely, and some offer their own separate text size control. Check inside each app's settings if you need a specific size there.
Will larger font size drain my battery faster?
No. Font size is just a display setting and does not affect power consumption. Changing text size will not make your battery drain any faster or slower than it does now.
Can I set different font sizes for different apps?
Not through the system settings — the font size slider applies to all apps that respect it. However, many individual apps have their own text size controls in their settings menus, so you can adjust each one separately if needed.
What is the difference between font size and zoom?
Font size makes text larger while keeping the rest of the interface the same size. Zoom magnifies everything on the screen together — text, buttons, images, and icons. Use font size if you only want larger text; use zoom if you want the entire interface bigger.
Why does my text size change when I update iOS?
iOS updates rarely change your font size setting itself, but they may change how apps display text. If text looks different after an update, check whether the app has its own text size control that may have reset, or whether you accidentally changed the system slider.