Thumbnail A/B
Tester

Our CTR prediction is based on visual analysis of factors proven to influence click-through rates, including color vibrancy, contrast, face presence, and text readability. While it provides a useful estimate, actual CTR depends on many factors including your title, audience, and competition. Use it as a guide, not a guarantee.

We analyze Color Vibrancy (how eye-catching the colors are), Contrast (visibility of elements), Text Readability (can viewers read it at small sizes), Face Detection (presence of human faces and emotions), and Overall Composition. Each metric contributes to the final CTR prediction score.

Yes! You can mix and match. Upload a custom thumbnail design for Thumbnail A and compare it against an existing YouTube video's thumbnail for Thumbnail B (or vice versa). This is great for seeing how your design stacks up against competitors.

We support all common image formats including JPG, JPEG, PNG, GIF, and WebP. For best results, use images that are at least 1280x720 pixels (YouTube's recommended thumbnail size).

The winner is determined by a weighted combination of all analyzed metrics. CTR prediction carries the most weight, followed by face detection (when applicable), contrast, color vibrancy, and text readability. The thumbnail with the highest overall score wins.

Yes, YouTube has a built-in "Test & Compare" feature for thumbnails, but it requires your video to be published and takes days to gather data. Our tool gives you instant insights before publishing, helping you make better decisions upfront. Use both tools for best results!

Humans are naturally drawn to faces - it's called "face bias." Thumbnails with expressive human faces (especially showing strong emotions like surprise, excitement, or curiosity) typically get 30-40% higher CTR than those without faces. This is why most successful YouTubers feature their face prominently.

YouTube recommends thumbnails that are 1280x720 pixels (16:9 aspect ratio) with a minimum width of 640 pixels. The file should be under 2MB and in JPG, GIF, or PNG format. Always design at full resolution even though most viewers will see it much smaller.

Test thumbnails before every upload and consider re-testing older videos that aren't performing well. Many successful creators also update thumbnails on their back catalog regularly. Testing takes minutes but can significantly impact your video's success.

The voting feature simulates viewer preference and adds human judgment to the technical analysis. While the votes shown are simulated for demonstration, the concept is valuable. For real audience testing, consider sharing your thumbnails on social media or with your community before publishing.