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og:image not showing: 10 causes and fixes

1. Relative URL. /img/og.png must be https://example.com/img/og.png.
2. Image returns 403/404 to bots because of hotlink protection or a WAF. Allow facebookexternalhit, LinkedInBot, Twitterbot, Slackbot and similar.
3. Tags injected by JavaScript. Crawlers don't run JS. Render tags on the server.
4. Too small. Under 200×200 is rejected by Facebook.
5. SVG or AVIF format. Use PNG or JPEG.
6. Too large. Over 5 MB fails on X, and big files time out elsewhere.
7. Wrong Content-Type, such as text/html for the image.
8. http:// image on a site that redirects or blocks http.
9. Stale cache. See clearing caches.
10. Page itself blocked or not 200 for the crawler (login walls, geo-blocks, cookie walls).

The previewer fetches your image like a crawler does and reports causes 1, 2 and 4–8 automatically.

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