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Open Graph Debugger

og-debugger requests a page with the Facebook crawler's user agent, reads every og:, twitter: and article: tag and works out what Facebook, LinkedIn and X will actually show — including the fallbacks each platform uses when a tag is missing. Then it downloads the share image and checks what breaks previews most often: a relative or broken URL, a format platforms do not accept, an image smaller than 200×200 or not 1.91:1, and files over the 5 MB / 8 MB limits.

• Getting started — install, first run, reading the output
• FAQ — common questions
• Troubleshooting — errors and how to fix them

Prefer a browser? The same check runs online at PromoPilot — free, no sign-up.