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How image CDNs hide the original: size tokens in URLs on Bluesky, Mercado Libre, Blogger, Steam and Google Play

Summary by DEV Community
Most big sites store one upload and serve resized copies of it from a CDN. The size of the copy is written into the image URL: sometimes as a path segment, sometimes as two letters before the extension, sometimes after an = at the end. If you know where that token sits, you can edit the URL in the address bar and get the stored file instead of the thumbnail. I measured five sites this week. Each image below was fetched with curl and its pixel si…
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DEV Community broke the news on Monday, November 9, 2026.
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