Thumbnail Roaster
Preview your YouTube thumbnail before you publish
See how your thumbnail looks on desktop, mobile, search, suggested videos and TV. Then get an instant readability and CTR-risk analysis.
Thumbnail
JPG, PNG or WebP · max 3 MB · 16:9 recommended
Your preview will appear here
Upload a thumbnail and enter a title to see different YouTube contexts.
YouTube-inspired visual approximation, not an exact reproduction.
Thumbnail analysis
Upload a thumbnail and click Analyze to get scores and recommendations.
FAQ
Can I preview a YouTube thumbnail before uploading?
Yes. Thumbnail Roaster shows how your design may appear across common YouTube surfaces before you publish.
Why does my thumbnail look bad on mobile?
Mobile cards are smaller, so text and detail shrink. Use the small-screen stress test to check legibility before publishing.
What makes a YouTube thumbnail readable?
Few competing elements, strong contrast, one clear focal point, and text that reads in a single glance—even when small.
Can KiThumbs track real CTR after publishing?
Yes. After you connect your channel, KiThumbs monitors official metrics and helps you decide which videos need a thumbnail refresh.