Make captions that people can use
A focused edit turns automatic text into a reliable way to follow a video.
Plan captions before export
Automatic captions are a starting draft for a published video. W3C's accessibility guidance includes captions for prerecorded synchronized media, and useful captions need more than approximate speech recognition. They help viewers understand words, identify speakers, and notice meaningful sound. Start by deciding where the video will be published and which caption formats that platform accepts. Keep an editable transcript with the project files. If you wait until a deadline to think about captions, unfamiliar export settings can become the most difficult part of a simple accessibility improvement.
Correct the information that matters
Watch the whole video while reading the text. Fix names, numbers, specialist terms, negations, and any sentence where a small recognition error changes the meaning. A mistaken not can reverse advice, while an incorrect name can make a source impossible to locate. Compare the caption text against the final edit, not an earlier recording. If the speaker restarts a sentence, preserve the meaning without making the text confusing. Do not silently add claims the speaker never made. Keep uncertainty visible when a word cannot be established from the recording or production notes.
Include meaningful sound
Identify sounds that a hearing viewer needs to understand the scene: an alarm, applause, a doorbell, or music that changes the mood. Add concise descriptions where they contribute to comprehension. Identify a new speaker when the image does not make the change clear. Avoid describing every incidental noise, which can crowd out the dialogue. If a joke depends on a sound, the caption should give the viewer enough information to understand it. For a demonstration, include the click or alert that signals a completed action when that signal is essential to following the process.
Check timing and presentation
Play the video at ordinary speed on a phone-sized screen. Captions should appear with the relevant speech and leave enough time to read. Break long text at sensible phrase boundaries. Check whether the platform overlays buttons, subtitles, or other graphics across important content. If captions are burned into the picture, use legible type and adequate contrast and keep a separate transcript when possible. If they are selectable, test that viewers can turn them on and that the selected language is correctly labeled. A clean desktop preview does not prove that the mobile viewing experience works.
Publish an accessible package
After uploading, replay a sample from the beginning, middle, and end to catch processing or synchronization errors. Include a transcript where it helps users search, quote, or review the material. Keep the caption file in the same archive as the final video and its permission records. If viewers report an error, correct the caption rather than waiting for the next video. Accessibility improves through a repeatable production habit. A short checklist covering meaning, sound, timing, and playback can fit into an ordinary publishing workflow and makes each subsequent video easier to produce well.
Sources & further reading
Source links support the factual context. Practical examples and suggested workflows are original editorial guidance. Sources checked October 5, 2026.
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