How to Customize Subtitles in iOS 18

Apple’s iOS 18 offers robust accessibility tools that allow users to personalize the appearance of closed captions and subtitles across system media apps, Safari, and compatible third-party streaming services. By adjusting system-level settings, you can modify typography, text color, background contrast, window shading, and text edge effects to significantly improve reading comfort and visual clarity on your screen.

Accessing Subtitle Styles in iOS 18

To adjust these settings, navigate to Settings > Accessibility > Subtitles & Captioning > Style. From this menu, you can select predefined presets or tap Create New Style to design a fully customized subtitle profile.

Typography and Text Modifications

iOS 18 allows you to tailor the primary appearance of subtitle text:

  • Font Choice: Choose from standard system typefaces (such as Helvetica, Courier, Georgia, and Trebuchet) or add third-party fonts installed on your device.
  • Text Size: Set size scaling to Very Small, Small, Medium, Large, or Extra Large to fit different viewing distances and screen sizes.
  • Text Color: Select from primary colors including White, Black, Red, Yellow, Green, Blue, Cyan, and Magenta.
  • Text Opacity: Adjust the transparency of the letters (0%, 25%, 50%, 75%, or 100%) to blend text naturally with on-screen action or keep it completely solid.

Text Edge Effects

To ensure subtitles remain legible against varying background scenes, you can apply distinct edge styles:

  • Drop Shadow: Adds a subtle shadow behind the text to separate it from bright scenes.
  • Raised: Creates an embossed, slightly elevated appearance.
  • Depressed: Insets the lettering slightly for a debossed effect.
  • Uniform: Surrounds each character with an even, high-contrast outline.
  • Edge Color: Customize the specific border or shadow color independent of the text fill.

Background and Window Styling

Contrast can be further improved by adding backgrounds behind individual lines or the entire subtitle region:

  • Background Color and Opacity: Places a colored bounding box directly behind the text. Setting the opacity from 0% (invisible) to 100% (solid) allows you to balance background video visibility with subtitle readability.
  • Window Color and Opacity: Adds a full rectangular banner across the entire subtitle display zone rather than tightly wrapping individual lines of text. This helps standardize caption positioning and eliminates distracting shape changes when subtitle lengths vary.

System Overrides

Every visual category includes a toggle labeled Video Overrides Style. Turning this setting off forces media applications that rely on standard AVKit players to use your customized visual profile, preventing content providers from overriding your font, size, and contrast preferences.