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Thumbnail Tester
Upload one thumbnail and add a video title. Review it in three familiar YouTube placements before publishing.
Add one image to start. Nothing is uploaded or saved.
Your preview
See the same thumbnail in three placements
Watch sidebar
Your video titleYour channelRecommended
Search results
Your video titleYour channel · views · date
This preview keeps the title beside your thumbnail, as in a search result.
What this thumbnail tester checks
Three layouts
Preview your image and title in a home feed, watch sidebar, and search-result layout.
Image facts, not invented scores
Resolution, aspect ratio, and luminance range are calculated from the image in your browser. Text readability remains a visual review.
Local and simple
One image at a time. No account, no saved history, no report download, and no server upload.
Supported images: JPG, PNG, WebP, GIF, and SVG. Practical limit: this page reads one image in your browser; very large images may take longer on your device.
Thumbnail tester FAQ
Is this a YouTube thumbnail tester?
Yes. It gives you local home-feed, sidebar, and search-result previews for one uploaded thumbnail and title.
Does this yt thumbnail tester need an account?
No. The page opens without registration and does not save your image.
Can I use this thumbnail tester for YouTube on a phone?
Yes. Choose an image from your phone and review the responsive previews without leaving the page.