Thumbnail Machine — Development skill for Claude Code

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Thumbnail Machine

A [Claude](https://claude.com) skill that turns any article, script, or topic into ready-to-run thumbnail and cover-image prompts — with your own face kept consistent across every image.

Throw your content at the agent. It reads it, asks you three rounds of questions (format + style + title → reference images → visual details), then writes an image prompt engineered for your exact format — and either generates the images for you or hands you the prompts to run anywhere.

Formats

Ratio	Built for
16:9	YouTube thumbnails, blog heroes
9:16	Reels / Shorts / TikTok covers, Stories
1:1	Instagram feed, podcast art
5:2	X (Twitter) Article cover headers
3:4	Portrait covers — Pinterest and vertical-feed platforms

Every format has its own composition logic and safe zones (YouTube's duration badge corner, vertical platforms' UI bands, X's banner crop) — a prompt written for 16:9 is recomposed for 9:16, not just re-cropped. Pick several formats in one run and each gets its own adapted prompt.

Examples

All six generated with this skill — same face reference across every image, five formats, four styles.

YouTube 16:9 — Dark Gradient	YouTube 16:9 — Poster Collage
Instagram 1:1 — Dark Gradient (narrative)	*Portrait 3:4