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# YouTube Thumbnail Experiments
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A checklist for testing thumbnail concepts with [Raphael AI](https://raphael.app).
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## 1. One subject, big
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Thumbnails are viewed tiny. Prompt for a single bold subject filling 60% of the frame.
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## 2. High contrast
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Use complementary colors: `orange subject on deep blue background`.
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## 3. Emotion
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For faces, specify the emotion strongly: `shocked expression, wide eyes`.
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## 4. A/B test
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Make two concepts and use your platform's test feature to compare click-through.
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## Tips
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- Add text in an editor, max four words.
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- Check the thumbnail at 160 px width before uploading.
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- Avoid misleading imagery; it hurts retention.
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## About the tool
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[Raphael AI](https://raphael.app) is a free browser-based text-to-image generator; no account is needed to try it: https://raphael.app
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License: CC BY 4.0 for the notes in this repository.
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