Know your thumbnail's CTR scorebefore you publish
Drop a thumbnail, get an AI-scored breakdown across 8 factors — visual clarity, emotional impact, text readability, and more.
Analyze your thumbnail — freeNo signup required · Results in ~10 seconds
- Publish, then wait 48 hours for Studio data
- Guess which thumbnail gets more clicks
- Realize too late the text is unreadable on mobile
- Get a CTR score in seconds before publishing
- See exactly which factors need improvement
- Fix issues before your audience sees them
How it works
Upload
Drop a thumbnail or paste a YouTube URL.
Score
AI scores 8 CTR factors: clarity, emotion, text, composition, color, curiosity gap, mobile, and brand.
Improve
See exactly what to fix — then re-score to confirm.
Questions? We've got answers.
How accurate is the CTR score?
The AI scores your thumbnail across 8 factors relative to your niche. It's a directional prediction, not a guarantee — but it catches issues like unreadable text, weak composition, or missing emotional impact before your audience does.
What are the 8 scoring factors?
- Visual clarity — how quickly the eye grasps the scene
- Emotional impact — strength of the emotional hook
- Text readability — legibility at feed size
- Composition — layout balance and focal points
- Color usage — contrast, palette, and feed standout
- Curiosity gap — how much it makes viewers want to click
- Mobile-friendliness — readability on small screens
- Brand consistency — match with your channel style
Can I score thumbnails I didn't make in ThumbBoost?
Yes. Upload any JPG, PNG, or WebP file up to 5 MB. You can also paste a direct image URL or a YouTube video link to analyze its current thumbnail.
How can I improve a low score?
Hit "Improve in Generator" and ThumbBoost passes the scoring feedback directly into the AI chat, which regenerates a better version addressing the specific weaknesses.
Does scoring work for any YouTube niche?
Yes. Scoring is niche-relative — the AI adjusts factor weights based on your content category (e.g. emotional impact matters more for vlogs, visual clarity matters more for tutorials).
Is my thumbnail data private?
Yes, completely. Thumbnails are only visible to you. We don't use your uploads to train AI models or share them publicly. You can delete your data at any time.
Still have questions? Email us — we typically respond within 24 hours.
Stop guessing your CTR. Measure it.
Upload a thumbnail and get your score in seconds.
No signup required · Results in ~10 seconds
Or generate thumbnails with AI