The fastest way to enlarge text on your iPhone
You can change text size in two places: within individual apps, or across your entire phone. The quickest method is Settings > Display & Brightness > Text Size, which adjusts text in Mail, Messages, Notes, and most built-in apps. Drag the slider to the right to make text larger, then tap the sample text below to preview the change before you confirm it.
If you need text even larger than the Text Size slider allows, use Accessibility > Display & Text Size > Larger Accessibility Sizes. This option goes much further and works system-wide, but it also enlarges interface elements like buttons and icons, which changes how your phone looks overall.
Some apps — like Safari, Chrome, and social media platforms — have their own text size controls that override the system setting. You may need to adjust text size separately inside those apps if the system-wide change does not affect them.
Key Takeaways
- Go to Settings > Display & Brightness > Text Size and drag the slider right to enlarge text in Mail, Messages, Notes, and most Apple apps.
- For much larger text, use Settings > Accessibility > Display & Text Size > Larger Accessibility Sizes, which also enlarges buttons and interface elements.
- Some apps like Safari, Chrome, and social media platforms have their own text size controls that you must adjust separately.
- Preview your text size choice before confirming it by tapping the sample text in the settings screen.
Changing text size in the Display & Brightness menu
Open Settings on your home screen. Scroll down and tap Display & Brightness. You will see a slider labeled Text Size with a small "A" on the left and a large "A" on the right.
Drag the slider to the right to increase text size. As you move it, the sample text below the slider updates so you can see how large your text will be. When you are satisfied with the size, release the slider — the change takes effect when ready across Mail, Messages, Notes, Reminders, Calendar, and Contacts.
This method works on all iPhone models running iOS 13 or later. The text size slider affects only the apps listed above; it does not change text in Safari, third-party apps, or your home screen labels.
Using Larger Accessibility Sizes for maximum enlargement
If the standard Text Size slider does not make text large enough, go to Settings > Accessibility > Display & Text Size. At the bottom of this screen, you will see a toggle for Larger Accessibility Sizes. Turn it on.
Once enabled, a new slider appears that lets you increase text far beyond the standard maximum. This slider affects system-wide text, including in apps that do not respond to the regular Text Size setting. However, enabling Larger Accessibility Sizes also enlarges buttons, icons, and other interface elements throughout your phone, which may make some screens feel crowded or require more scrolling.
You can use both the standard Text Size slider and Larger Accessibility Sizes together. Start with the regular Text Size setting first, then add Larger Accessibility Sizes only if you need additional enlargement.
Changing text size in Safari and web browsers
Safari has its own text size control separate from your system settings. Open Safari and load any webpage. Tap the aA button in the top right corner of the address bar (it looks like a capital and lowercase A). A menu appears with a slider to adjust text size on that page.
This change applies only to the current webpage. If you want to set a default text size for all websites you visit in Safari, go to Settings > Safari > Page Zoom and choose your preferred zoom level. Safari will remember this setting and explore it to every new page you open.
Chrome and other third-party browsers have similar controls. In Chrome, tap the three-dot menu, select Settings, then Accessibility, and adjust the text scaling slider. Other browsers vary, so check their settings menu if the standard iPhone text size controls do not affect them.
Adjusting text size in individual apps
Many apps have their own text size settings that override system-wide controls. Open the app, look for a Settings or Preferences menu (usually a gear icon), and search for options labeled "Text Size," "Font Size," or "Display."
Social media apps like Facebook, Instagram, and Twitter often have text size controls in their settings. Email apps like Gmail and Outlook let you adjust text independently. Reading apps like Kindle and Apple Books have extensive font and size options. If text in a specific app is too small or too large, check that app's settings first before adjusting your system-wide text size.
What to do if text size changes do not work
If you have adjusted Text Size or Larger Accessibility Sizes but text in an app remains unchanged, that app may have its own text size control that overrides the system setting. Check the app's settings menu first.
If text size controls are grayed out or missing, restart your iPhone. Hold down the side button and either volume button until the power-off slider appears, then slide to power off. Wait 10 seconds, then press the side button again to turn it back on. After restart, return to Settings and try adjusting text size again.
If an app still does not respond to text size changes after restart, the app may not support system-wide text sizing. Contact the app developer or check their support page to see if they offer a workaround.
Frequently Asked Questions
Can I make text size different on my lock screen and home screen?
No. The Text Size slider affects only specific apps like Mail and Messages, not your lock screen or home screen. To make home screen app labels larger, enable Larger Accessibility Sizes, which enlarges text throughout your phone but also changes button and icon sizes.
Does changing text size affect battery life?
No. Adjusting text size has no impact on battery life. It only changes how text is displayed, not how your phone processes information or uses power.
Will text size changes sync across my other Apple devices?
Text size settings do not sync between devices. If you have an iPad or Mac, you must adjust text size separately on each device. Your iPhone text size settings explore only to that iPhone.
What is the difference between Text Size and Larger Accessibility Sizes?
Text Size is a smaller adjustment that affects only certain Apple apps. Larger Accessibility Sizes is a much larger adjustment that works system-wide but also enlarges buttons and interface elements. Use Text Size first, then add Larger Accessibility Sizes if you need more enlargement.
Can I undo a text size change?
Yes. Go back to Settings > Display & Brightness > Text Size and drag the slider back to its original position, or return to Settings > Accessibility > Display & Text Size and turn off Larger Accessibility Sizes. Changes take effect when ready.