Finding the full-size original behind a thumbnail: srcset, CDN size rules and fallbacks

Dev.to•Sun, Nov 8, 2026, 07:24 PM•2 min read

The image you see on a page is almost never the file the site stores. A Wikipedia infobox shows the Eiffel Tower at 330 px wide while the uploaded photo is 2900 × 4830. An Unsplash grid tile is 400 × 267; the same photo without the query string is 7360 × 4912.

Source: [Dev.to](https://dev.to/casper_tran_59c6a8b1e1f3d/finding-the-full-size-original-behind-a-thumbnail-srcset-cdn-size-rules-and-fallbacks-2aj6)

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