Readable captions need accurate wording, enough time, clear contrast, sensible line breaks, and a position that does not hide important content. A large font alone cannot compensate for too many words or captions that disappear before the viewer can read them.
Start with the actual audio.
Correct the transcript before styling it. Check names, numbers, short connecting words, and any phrase whose meaning changes if one word is missing. Recheck captions after replacing a voiceover; the old text or timing may no longer match. Use the worked audio correction example to trace a replacement line through the music mix, caption cues, and next scene.
W3C’s caption guidance explains that captions represent meaningful speech and non-speech audio, and that automatic captions need accuracy review. A decorative headline is not a replacement for complete captions.
Split the thought at a useful boundary.
| Illustrative draft | Improved grouping |
|---|---|
| Find the coffee that fits your morning routine and the way you like to brew. | Find the coffee that fits your morning routine. / And the way you like to brew. |
| Your next step starts here with all your study resources organized in one place. | Your next step starts here. / Your study resources, in one place. |
These are authored editing examples, not documented corrections from a client file. The second example shortens wording; it would require a matching script or voice change. Do not silently paraphrase a speaker while claiming the text is a faithful caption.
Check the whole frame.
Place captions where they remain legible over the changing background. A consistent backing or carefully chosen position can help, but check every scene. Avoid covering product labels, faces, essential interface controls, and other on-screen words.
Preview the intended placement with its surrounding controls before delivery. There is no single margin that guarantees compatibility with every app layout, device, or future interface change. Use the vertical video layout preview to explore text placement and crops before editing. It is a planning tool; use current placement previews for final checks.
Run a normal-speed reading pass.
Watch without pausing and without sound. If you need to stop playback to finish a line, reduce the amount of text or give it more time. Then listen and check synchronization. Review the final exported file, because font rendering and cropping can differ from an editor preview.
Keep captions and headlines visually distinct. The headline can summarize the scene while captions carry the speech. If both compete for the same attention, simplify the layout rather than adding another text treatment.