Free YouTube thumbnail analyzer. Upload your thumbnail, get a CTR score across brightness, contrast, faces, color and text. 1280×720 size checker.
Your thumbnail is the first thing a viewer sees, and it often decides the click. Upload your cover and this tool scores brightness, contrast, color balance, and face and text density separately, then checks the 1280x720 size.
If you want to know in seconds whether your thumbnail stands out in the feed before you publish, this is for you. Stop guessing, upload your cover, fix the weak spot.
The recommended YouTube thumbnail size is 1280×720 pixels (16:9), under 2 MB, JPG or PNG format. Our thumbnail analyzer flags images below that resolution as "low_res" and images not matching 16:9 aspect as "off_ratio" — both hurt CTR.
The analyzer scores 7 signals: brightness (ideal 100-180 luma), contrast (55-90 std-dev), saturation (90-170), face count (1 best, 3+ cluttered), text density (balanced 8-18% edge ratio), resolution (1280×720+), and aspect (16:9). Weighted average gives the 0-100 CTR score.
High-contrast warm colors (red, orange, yellow) on dark backgrounds consistently outperform pastels. The analyzer extracts your thumbnail's top 5 dominant colors so you can see if you're accidentally using YouTube's own UI colors (which blend in).
One clear expressive face typically lifts CTR 20-40%. Three or more faces compete for attention and reduce CTR. The analyzer uses face detection and flags "crowded" when too many are visible — common mistake with group-shot thumbnails.