video-thumbnail-generator

name: video-thumbnail-generator description: Create platform-ready thumbnails from real video frames. Use when the user wants a thumbnail, cover image, YouTube cover, Shorts cover, Bilibili cover, Xiaohongshu cover, or other video poster image.

Video Thumbnail Generator

Use this skill to create a high-clarity thumbnail or cover image from the actual video content.

Non-Negotiables

1. Use the real video as visual evidence.

   • If the thumbnail shows a person, product, UI, frame, or scene from the video, extract or inspect real frames.
   • Never invent a generic software interface, fake product screen, or unrelated person.

2. Read style references before recommending styles.

   • Use references/thumbnail-styles.md and references/thumbnail-style-recipes.md.
   • Only offer style directions supported by those references or by the user's explicit instruction.

3. Keep text short and readable.

   • Usually 2-5 words.
   • Avoid thin type, low contrast, small labels, and clutter.

Workflow

1. Confirm platform and aspect ratio if missing.
   • YouTube / Bilibili: usually 16:9.
   • Shorts / TikTok / Douyin: usually 9:16.
   • Xiaohongshu / WeChat Channels: usually 3:4.
   • Correct ambiguous ratio language gently, especially 4:3 vs 3:4.