YouTube: Thumbnails, Captions and Chapters Workflow

Size 1280×720; high contrast and clear subject

Use consistent branding and readable text

Preview at small sizes to check legibility

Prepare SRT files; ensure timing accuracy

Keep line length moderate and avoid clutter

Support multiple languages when possible

Add chapter timecodes in description

Use clear titles; align with content sections

Combine with /tools/video-compress to keep files manageable