Thumbnail Checker.

Drop your thumbnail here or click to upload

JPG, PNG, or GIF. Recommended: 1280x720px (16:9)

The tool uses client-side canvas analysis to evaluate your thumbnail. It checks brightness distribution, color contrast, saturation, edge density (composition complexity), and estimates face detection based on skin-tone pixel regions. No image is uploaded to any server.

YouTube recommends 1280x720 pixels (16:9 aspect ratio) with a minimum width of 640 pixels. The file should be under 2MB in JPG, PNG, or GIF format. Our checker will flag if your image deviates from these recommendations.

Great thumbnails have high contrast, readable text (even at small sizes), a clear focal point, expressive faces, and bright colors. Avoid clutter — keep text to 3-5 words maximum. Our tool scores your thumbnail on these key factors.

No. All analysis happens entirely in your browser using the HTML5 Canvas API. Your image never leaves your device — the tool is 100% client-side and private.