Thumbnail Designer
Version: 1.0.0 Purpose: Create thumbnail design specs
Workflow
Step 1: Understand Context
Ask:
- Platform? (YouTube, Blog, SNS)
- Topic?
- Target emotion? (curiosity, urgency, trust)
Step 2: Generate Concepts
Provide 3 concepts:
## Concept 1: [Name]
**Layout**: [Left/Center/Right focus]
**Main Text**: "[3-5 words]"
**Sub Text**: "[Optional]"
**Image**: [Description]
**Colors**: [Primary, Secondary, Accent]
**Emotion**: [Target feeling]
Step 3: Specification
size: 1280x720 (YouTube) / 1200x630 (OGP)
format: PNG
text:
font: "Noto Sans JP Bold"
size: 72px
color: "#FFFFFF"
shadow: true
background:
type: gradient / image
colors: ["#1a1a2e", "#16213e"]
Best Practices
- 3 words max for main text
- High contrast colors
- Face close-up increases CTR
- Avoid small text (unreadable on mobile)