How to create captions that stay readable, accurate, and consistent every week.

Start with the accessibility requirement

W3C explains that captions provide spoken words, speaker identification when needed, and important sounds in synchronized text. For prerecorded video with meaningful audio, captions are required at WCAG Level A. Read W3C’s caption guidance.

Use the final timeline

Do not burn master subtitles using original source timestamps after removing retakes or rearranging segments. Once the selected segments are concatenated, calculate caption offsets against the output timeline. Otherwise, every cut can push later captions out of sync.

Create a small caption style system

• Typeface and weight that remain readable at mobile size
• Maximum line length and number of lines
• Position and safe-area rules for each aspect ratio
• Text, highlight, outline, and background colors with sufficient contrast
• Rules for emphasis, speaker changes, numbers, and punctuation
• Whether captions are burned in, supplied as a separate track, or both

Break lines by meaning

Avoid splitting names, short phrases, articles from nouns, or a preposition from its object merely to fill equal-width lines. Prefer phrase boundaries and leave enough display time to read the complete thought. Styling should never outrun comprehension.

Final QA checklist

1. Read the caption text against the actual spoken words.
2. Check names, brands, technical terms, and numbers manually.
3. Watch without sound to test comprehension.
4. Watch with sound to test synchronization.
5. Inspect placement over faces, lower thirds, controls, and platform UI.
6. Check the first and last captions and several points after edit boundaries.
7. Verify the final aspect ratio at phone size.

Make consistency reusable

Store caption conventions with the project’s brand and editing instructions. A weekly workflow should not require the team to restate typography, colors, placement, and emphasis rules for every episode.