Caption Accessibility: 7 Best Practices for Inclusive Videos
Captions are essential for deaf and hard-of-hearing viewers. Here are seven practical guidelines for captions that are accurate, readable and inclusive.
Vixo team · · 3 min read
For many viewers, captions are a convenience. For people who are deaf or hard of hearing, they're the only way to access what's said in a video. Good captions don't take much extra effort, but they make a big difference to the people who rely on them.
These seven practices draw on widely used captioning guidelines and are easy to apply to any video, including short social clips.
1. Accuracy comes first
Captions should match what's said, word for word wherever possible. Automatic speech recognition gets you most of the way, but always proofread before publishing. Pay special attention to:
- names of people, places and products,
- numbers, dates and prices,
- technical terms and acronyms,
- words that sound alike but mean different things.
A small error can completely change the meaning for someone who can't hear the audio to correct it in their head.
2. Keep captions in sync
Captions should appear when the words are spoken and disappear soon after. Text that comes early gives away the punchline. Text that comes late makes the viewer feel lost.
Word-level timing, which Vixo creates automatically, keeps each word tied to the moment it's said.
3. Make them readable
Readability depends on size, contrast and pacing:
- Size: Text should be easy to read on a phone at arm's length.
- Contrast: Light text on a dark outline or box (or the reverse) works on any background. Avoid thin text directly over busy footage.
- Pacing: Don't show more text than a viewer can comfortably read before it changes. Shorter lines that change often are easier than long lines that change rarely.
4. Don't block important visuals
Captions should never cover a speaker's mouth (many people lip-read alongside captions), on-screen text, or the main action. See our guide to caption placement and safe zones.
5. Include meaningful sounds
Full accessibility captions describe important non-speech audio, written in brackets:
- [music], [upbeat music], [suspenseful music]
- [laughter], [applause]
- [phone rings], [door slams]
You don't need to caption every background noise, only sounds that matter to understanding the video. Automatic tools focus on speech, so add these yourself when they're important. In Vixo you can type them into any caption line.
6. Identify speakers when it isn't obvious
When several people talk and it isn't clear from the picture who's speaking, add a label, for example "Sam:" or "[Interviewer]". On short single-speaker videos, this usually isn't needed.
7. Prefer readable styles over flashy ones for long content
Animated, word-by-word captions work well in short social videos. For longer content such as lectures, tutorials or interviews, plain, steady captions are easier to read for long periods. Consider:
- sentence case instead of ALL CAPS (all-caps text is slower to read over long stretches),
- a simple sans-serif font,
- a background box for consistent contrast,
- longer lines that change less often.
Bonus: caption files for long-form platforms
For YouTube videos, courses and website video players, you can also provide closed captions (an SRT or VTT file) so viewers can turn captions on and off and adjust their appearance. Read open vs. closed captions to decide which suits your video.
Accessibility is an audience
Treating captions as part of the production, not an afterthought, makes your content available to more people and better for everyone else too. Accurate, well-timed, readable captions are a simple way to show you thought about your whole audience.