Thumbnail Tester
Preview YouTube thumbnails before you publish
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Thumbnail Tester - Preview YouTube thumbnails before you publish

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A browser-only thumbnail tester and downloader: upload a local image, compare desktop and phone feed layouts, check light and dark modes, and save a PNG. YouTube links stay in the browser.

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Maker
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I built this to catch cropping and contrast problems before a thumbnail goes live. The preview and downloads run in the browser, so local images are not uploaded to this site.