Useful video captions reproduce the meaning of speech accurately, include important sound information and appear at a readable pace. Check names, numbers and technical terms by hand. Preview the final video on a phone so captions remain visible, do not cover the subject and make sense when the sound is off.
Captions need to communicate more than words
Terminology varies, but W3C’s captions and subtitles guidance distinguishes captions that represent relevant audio from translated subtitles. Important sounds and speaker changes may need explaining as well as speech.
If a sound affects the meaning, somebody who cannot hear it needs that information. If the music is merely background decoration, a detailed description of every note would not help.
Decide what the viewer must understand before editing the captions. A business demonstration and a spoken interview need different treatment.
Automatic captions are a draft
W3C warns that automatically generated captions need checking for accuracy. Small errors can change a statement completely, especially a missing negative or an incorrect number.
Listen through while reading the text. Check names, places, product terms and anything a general speech recogniser may not know. Ask the speaker or subject owner to confirm uncertain technical wording.
Do not tidy speech so aggressively that you change the meaning. You can remove an obvious transcription error, but a caption should not make a stronger promise than the person actually made.
Build checking into the editing process
- Finish the spoken edit before producing the final caption file.
- Generate or transcribe the text and correct it against the audio.
- Check technical details with the appropriate person.
- Adjust timing and line breaks.
- Preview the final export in its intended format.
- Review the uploaded version before publication.
If the video edit changes, recheck the captions. A removed pause or shortened sentence can leave later text out of time. Keep the caption file and video version clearly paired.
Save the editable source as well as the final export. That makes corrections possible without rebuilding the whole video from a finished file.
Make the text comfortable to read
Use short, coherent groups of words. A line break should help the reader follow a phrase, not divide it in the middle of a name or an important expression.
Give each caption enough time to be read. If the speaker moves quickly, consider whether the video edit needs more breathing space rather than squeezing smaller text onto the screen.
Use a clear typeface and adequate contrast. The W3C contrast guidance provides a useful check for text against its background. A moving picture can change that background constantly, so a consistent backing or carefully designed caption area may help.
Check placement on a real phone
Platform controls, account names and other overlays can cover the lower or side areas of a video. Preview the actual placement rather than relying only on the editing window.
Keep captions away from the detail being demonstrated. If somebody is showing a small fitting or pointing at a document, text placed over their hands can defeat the explanation.
Check vertical and horizontal versions separately. A layout that works in one crop may hide the subject in another. Treat each export as something that needs review.
Choose how captions will be delivered
Some publishing routes accept a separate caption file; others rely on text included in the video or platform-generated captions. Check the current options for the channel you are using.
A separate file can allow the viewer to switch captions on or off where supported. Captions included in the image remain visible, but cannot normally be adjusted in the same way. Choose deliberately and test the uploaded result.
Watch for duplicate captions if both the video and the platform display them. Two overlapping sets are harder to read than either one alone.
What about information shown only on screen?
Captions address audio. They do not automatically explain a diagram, a visual demonstration or a written price shown without being spoken.
Where that information matters, include it in the spoken explanation, an appropriate description or an accompanying text alternative. A viewer should not need to see a fleeting label to understand the main point.
For a practical business video, a short supporting page or post can also carry the key steps and contact details. Keep those facts consistent with the film.
Approve the whole experience
Watch the final version once with sound and once without. Check whether the point still makes sense, whether the important qualification survives and whether the next step is clear.
Record who checked the technical wording and which version was approved. Caption quality is part of the content, not a finishing extra to add after everyone has signed it off.
Our social media content work includes preparing material people can follow. Plan the footage with the guide to getting useful content from one shoot, and use the visual selection guide to keep the subject clear.