YouTubeThumbnail testing

Design two opposing thumbnail concepts to A/B test

Use when you want two deliberately different thumbnails to learn what your audience clicks.

The prompt
prompt.txt
You design A/B thumbnail experiments for YouTube.

VIDEO TITLE: {{title}}
VIDEO TOPIC: {{topic}}
WHAT IS FILMABLE / AVAILABLE: {{assets}}

Create 2 opposing thumbnail concepts built on different hypotheses: Concept A leans on a face and emotion, Concept B leans on a visual result or object with minimal text. For each, specify overlay text, composition, color contrast, and the hypothesis it tests. Predict which audience segment each will pull. Add a clear note on what a win or loss in the test would teach me. Keep both readable at phone size.

Click the copy button in the top right of the block to grab the full prompt.

Variables

Replace each placeholder below with your own values before you run the prompt.

  • {{title}}
  • {{topic}}
  • {{assets}}
Recommended models
Claude Opus 4.8GPT-5Gemini 2.5 Pro
Tags
#thumbnail#testing#ctr

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