How to create and review accessible captions with AI
To create accessible captions with AI assistance, start with checked text and review timing in the video. Recognizing words is only part of the task: readers need to follow speakers and sounds that help explain the scene.
The example is a short training video with two people and an audible alert. We will prepare a reviewable draft without assuming automatic generation solves every accessibility aspect of publication.
Understand what the captions represent
The W3C captions and subtitles guidance explains the relationship between speech, sound information and synchronization. Use it to distinguish complete captions from a translation containing only dialogue.
Note sounds that change understanding of the video. An alert signaling the end of a step may need representation, while noises without an informative role require a different editorial decision.
Do not add effects absent from the recording. Captions describe the existing material rather than a more dramatic version of the scene.
Prepare a reviewed textual base
Check names, instructions and negations against the audio before splitting text into blocks. If an instruction says “do not press,” losing that word changes the training.
The transcript review guide helps with this stage. Keep uncertainties marked until someone can resolve them by listening to the recording.
Request a first division with context
Explain that the text will be read during playback and needs to follow the speech. If the tool lacks access to the media or timestamps, do not ask it to pretend timing was checked.
Prepare a caption draft from this reviewed transcript.
Preserve instructions, names and relevant sound information.
Suggest blocks following units of meaning; do not detach a negation.
Distinguish speakers when necessary to understand the scene.
Use only supplied timestamps; mark missing ones for review.
Do not claim the file has been validated against the video.The tool can suggest line breaks, but you need to check whether they follow the actual pace. A seemingly short division on the page may be too fast when the person speaks.
Inspect an example in the chosen format
If the player accepts WebVTT, the following structure illustrates two blocks. The timestamps are only a teaching example and must match the actual media in the final file.
WEBVTT
00:00:01.000 --> 00:00:04.000
Instructor: Check the file name.
00:00:04.500 --> 00:00:06.500
[Audible alert]Check the format your platform actually accepts before preparing the entire material. A well-formed file does not prove it will display correctly at the destination.
Review inside the player
Watch the video with captions enabled and compare their beginnings, endings and scene changes. Check whether an earlier caption remains on screen after another person starts speaking.
| Check | Practical question |
|---|---|
| Fidelity | Does the text preserve what was said? |
| Sound | Does necessary sound information appear? |
| Synchronization | Does the block follow the speech or event? |
| Identification | Is the speaker clear when it matters? |
| Display | Do captions cover essential visual information? |
Repeat the reading without relying on audio to notice gaps. That is a useful check of your material rather than a complete assessment of every access need.
Common mistakes and delivery criteria
Avoid treating an automatic draft as final, inventing timestamps and removing meaningful sounds to fit more speech. Also distinguish captions appearing from captions being possible to follow.
Finish when content and timing have been checked in the version to be published. Compare the uploaded video against the exact caption file selected. Record outstanding issues and keep an editable copy for corrections without restarting the entire process.
Frequently asked questions
Are accessible captions only a written version of speech?
No. They also need to communicate relevant sound information and identify speakers when necessary to understand the scene.
Can automatic captions be published without review?
Review content and synchronization in the video. Automatic output may omit words, misattribute speech or leave out important sounds.
Does a transcript replace a caption file?
They are different deliveries. A transcript can support creation, but captions must be synchronized with the media and work in the player.