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For subtitles that stay readable across changing scenes and screens, use a clear sans-serif font, strong text-to-background contrast, short cues, and a consistent position that does not cover important content. Then preview the exported video in its destination player: styling that looks right in an editor may not carry over to every platform or caption format.
First, decide whether you need subtitles or captions
These terms are used differently across platforms and regions. In common usage, subtitles often show dialogue, sometimes translated into another language. Captions convey speech and relevant non-speech audio needed to understand the video, such as a meaningful sound or music cue. That additional information can matter to Deaf and hard-of-hearing viewers.
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Captions can be closed, so viewers can turn them on or off, or open (often called burned-in), meaning they are part of the video image. Closed captions may allow viewer preferences; open subtitles are always visible and cannot be switched off. W3C WAI explains the distinction and notes that player support for styling is inconsistent: Captions/Subtitles in Making Audio and Video Media Accessible.
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Choose a readable visual style
Use a simple font and a stable background treatment
Start with a legible sans-serif face and a size that remains readable on the smallest screen you expect people to use. Section508.gov gives 18-point white text on a translucent black background as an example default, not a universal minimum or pixel-size prescription. Adapt the size to the player and video, and use a consistent background treatment so the text remains distinguishable when the scene changes. See Section508.gov’s captions and transcripts guidance.
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Prioritize contrast over decoration
WCAG 2.2 specifies a contrast ratio of at least 4.5:1 for normal text and 3:1 for large text under its applicable text-contrast criterion, which includes stated exceptions. These ratios are a useful design reference, but choosing particular colors does not by itself prove that a subtitle implementation conforms. Check the text against the actual background, including difficult frames. See WCAG 2.2, Success Criterion 1.4.3.
Keep speaker and sound cues clear without relying on color alone
When viewers cannot readily tell who is speaking, identify the speaker with a name or another clear textual label. Captions should also include meaningful non-speech sounds where needed to understand the content. Keep these conventions consistent, and do not use color as the only way to identify speakers or sound types.
Write cues that are easy to follow
- Keep a displayed cue to no more than two lines as a practical starting point.
- Aim for 45 characters or fewer per line; fewer characters can be easier to read. Section508.gov presents this as guidance, not a rule that fits every language or platform.
- Synchronize the text with speech, leave it on screen long enough to read, and avoid distracting scrolling or flashing effects.
- For captions, include relevant sound information and speaker identification when needed, rather than treating dialogue as the only content.
Line length and reading time depend on the language, pace, and player. Preview the actual cue sequence rather than judging a subtitle style from a single still frame.
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Lower-center is a familiar default, but it is not right for every shot. Move text when it covers a face, sign, label, or other information viewers need to see. WCAG 2.2 says captions should not obscure or obstruct relevant information in the video.
For open subtitles, inspect the entire frame and consider how the image may be cropped on mobile. For closed captions, check whether the destination player supports the positioning you want and whether viewers can change the presentation.
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Choose open or closed text based on the viewing experience
| Approach | Viewer control | What to check |
|---|---|---|
| Open subtitles or burned-in captions | Always visible; viewers cannot turn them off. | Check contrast and placement against the full frame, including likely mobile crops. |
| Closed captions or subtitles | Viewers can show or hide them; some players offer style preferences. | Confirm the player supports the desired file format, styling, and positioning. |
Neither approach guarantees the same appearance everywhere. W3C WAI cautions that browser and media-player support for author-positioned and styled captions is inconsistent and sometimes unreliable. Many web videos use a player’s default presentation, while some players let viewers adjust text style, size, colors, and position. Do not assume a burned-in design convention also applies to user-controlled captions.
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Subtitle and closed-caption files can contain spoken text, and some formats can also carry positioning and style information. YouTube documents format-dependent styling support. Its WebVTT documentation describes positioning support but limited styling, listing bold, italic, and underline. Consult YouTube’s supported subtitle and closed-caption files documentation for the format you plan to upload; do not assume settings from an editing app will transfer unchanged.
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- Set the intended presentation. Choose open text or a caption file, and apply a consistent font, size, contrast treatment, and cue layout.
- Review challenging scenes. Check bright, dark, busy, and changing backgrounds, and move text if it blocks relevant imagery.
- Inspect the exported video or uploaded captions in the destination player. Verify line breaks, timing, position, and style in the format viewers will actually see.
- Check more than one screen size when possible. Confirm that text remains legible and that open subtitles are not lost to cropping.
For additional accessibility guidance on synchronized media, see Section508.gov’s video and other synchronized media resource.
What WCAG 2.2 does—and does not—establish
WCAG 2.2 is the published W3C recommendation used here for the contrast and unobstructed-caption guidance. W3C’s WCAG 3.0 page dated September 10, 2026 is a Working Draft, not a published replacement recommendation. It discusses developing criteria for adaptable caption appearance, including size, weight, style, foreground and background colors or transparency, placement, unobstructed captions, and speaker identification. Treat that material as draft work rather than a conformance requirement.
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