Show HN: ThumbGlance – Browser-local YouTube thumbnail preview and resize

Category: devtools

Tags: youtube, thumbnail, browser-only, creator-tools, image-preview

Score: 3.3/10 (Innovation: 3, Technical: 3, Documentation: 6, Utility: 4)

ThumbGlance is a browser-local tool that lets YouTube creators preview how their thumbnails will appear across desktop, mobile, search, sidebar, and Shorts layouts, while checking aspect ratio, resolution, file size, and title length against YouTube's published guidance. It's interesting mainly for its privacy-first, client-side approach and its honest positioning as a layout preview rather than a click-through-rate predictor.

Target audience: content creators, YouTubers, social media managers

Repository: https://thumbglance.com/

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