Change text size directly in your device settings

Most phones and computers let you make text larger or smaller without installing anything new. On Android phones, go to Settings, then Display, then look for Font Size or Text Size — you'll see a slider with a small "A" on one end and a large "A" on the other. On iPhones, open Settings, go to Display & Brightness, then Text Size and adjust the slider. On Windows computers, right-click your desktop, select Display Settings, scroll to Scale and Layout, and change the percentage — 125% makes text noticeably larger without breaking most websites.

Mac computers have a similar path: open System Settings, click Displays, then look for Text Size or Resolution. Some older Macs use Accessibility instead — if you don't see it under Displays, go to System Settings, then Accessibility, then Display, then increase Text Size. These built-in changes affect almost everything you see: email, websites, documents, menus. They're the fastest way to make reading easier without changing anything else about how your device works.

Key Takeaways

  • Android phones have a Font Size slider in Settings > Display that makes text larger across all apps and websites.
  • iPhones use Settings > Display & Brightness > Text Size to adjust text in most apps, though some apps may not respond to this setting.
  • Windows computers let you scale everything to 125% or 150% in Display Settings, which enlarges text system-wide.
  • Mac computers offer Text Size controls in System Settings > Displays or in Accessibility > Display depending on your macOS version.
  • Web browsers on any device have their own zoom controls (usually Ctrl + Plus on Windows or Command + Plus on Mac) that override device settings for that browser only.

Use your web browser's zoom feature for websites only

If you only want larger text when you're reading websites, use your browser's built-in zoom instead of changing your whole device. On Chrome, Firefox, Safari, or Edge, hold Ctrl (Windows) or Command (Mac) and press the Plus key — each press makes text about 10% larger. You can also click the three-line menu in the top right corner, find Settings or Preferences, and look for Zoom to set a permanent level. This zoom only affects that browser, so your email, text messages, and other apps stay at their original size.

Browser zoom is useful if you want large text only while browsing but normal-sized text everywhere else. The downside is that you have to set it separately in each browser you use — if you use both Chrome and Firefox, you'll need to zoom each one. Also, zooming too far (above 150%) can break some website layouts, making buttons or text boxes disappear off the edge of the screen. Start at 125% and go higher only if you need it.

Make text larger in specific apps

Some apps have their own text size controls that override your device settings. In Gmail on any device, look for the Settings gear icon, then find Display Density or Text Size and choose Comfortable or Larger. In Microsoft Word or Google Docs, use the Zoom slider in the toolbar — it's usually in the bottom right corner on computers or in the View menu on phones. In Facebook, Instagram, and Twitter, go to Settings, find Accessibility or Display, and look for Text Size or Font Size options.

These app-specific controls are helpful when one app is harder to read than others, but they only work within that single app. If you change text size in Gmail, it won't affect your text messages or your web browser. Check the Settings menu of any app you use regularly — most have at least a basic text size option, though not all do. If an app doesn't have its own text size control, changing your device's text size will usually affect it.

Use accessibility features for more control

If standard text size adjustments aren't enough, your device has accessibility features that go further. On Android, go to Settings > Accessibility > Display and Text, where you'll find options for Bold Text, High Contrast Text, and Text Scaling that work together. On iPhone, go to Settings > Accessibility > Display & Text Size and turn on Bold Text or Larger Accessibility Sizes — Larger Accessibility Sizes goes much bigger than the regular Text Size slider. On Windows, go to Settings > Accessibility > Display and turn on Make Text Bigger, which can scale text beyond the normal 150% limit.

These accessibility features are designed for people with low vision and often work better than regular text size controls because they affect more of your system at once. Bold Text makes letters thicker and easier to distinguish. High Contrast Text adds darker backgrounds behind text so it stands out more. Larger Accessibility Sizes on iPhone can make text two or three times bigger than normal. Try these if regular text size changes aren't working well enough, but be aware that very large text sizes may make some apps or websites look strange or cut off parts of the screen.

What to do if text size changes break your apps

Occasionally, making text very large causes problems: buttons might disappear, text might overlap, or an app might crash. If this happens, the first step is to reduce the text size back to where the app worked, then increase it more gradually. If an app consistently breaks at larger sizes, check whether that app has its own text size setting — use the app's setting instead of your device setting, since app developers sometimes test their own controls more carefully.

If an app is broken and has no text size option, you have two choices: use a different app that does support larger text, or contact the app's developer to report the problem. Most major apps (Gmail, Word, Facebook, Chrome) handle large text well because millions of people use them with accessibility features. Smaller or older apps sometimes don't. You can also try zooming only in your web browser instead of changing your device, since websites are usually more flexible than apps.

Combine text size with other readability changes

Text size works best when combined with other readability features. If you've made text larger but still find reading difficult, try turning on High Contrast or Bold Text at the same time — these make letters stand out more against the background. Reduce blue light in the evening by turning on Night Light (Windows) or Night Shift (Mac and iPhone) — this makes the screen warmer and easier on your eyes when reading for long periods. Increase the brightness of your screen, especially if you're reading in a dim room.

You can also change the background color of some apps and websites. In Gmail, click Settings > Themes and choose a dark theme if bright white backgrounds bother you. In most web browsers, you can install extensions that let you choose custom colors for any website — search your browser's extension store for "dark mode" or "custom colors". These changes work together: larger text plus bold plus dark background plus night light creates a much easier reading experience than just making text bigger alone.

Frequently Asked Questions

Will changing text size on my phone affect my apps?

Yes, most apps will respond to your device's text size setting, but some won't. Apps like Gmail, Messages, and Chrome usually respect your text size choice. Older apps or games sometimes ignore it. If an app doesn't get larger when you increase text size, check whether that app has its own text size setting in its menu.

Can I make text bigger on just one website without zooming the whole browser?

Not easily. Browser zoom affects the entire browser window. Some websites let you change text size through their own settings (like Gmail or Medium), but most don't. Your best option is to zoom the whole browser, which is quick and works on any site.

What's the difference between text size and zoom?

Text size is a device or app setting that makes letters bigger throughout your system. Zoom is a browser feature that enlarges everything on a webpage, including images and buttons. Text size is permanent until you change it; browser zoom resets when you close the browser (unless you set a default).

If I make text very large, will it use more battery on my phone?

No. Text size doesn't affect battery life. However, if you turn on Bold Text or High Contrast at the same time, these features use slightly more power because they change how the screen displays colors — the difference is usually too small to notice.

Can I set different text sizes for different apps?

Not through your device settings — you can only set one text size for your whole device. But many apps have their own text size controls, so you can make Gmail larger while keeping Messages at normal size. Check each app's settings menu to see what options it offers.