Open Graph Generator

Four tags carry the preview

og:title, og:description, og:image and og:url. Without them, platforms scrape whatever they can find — often the first paragraph, a navigation heading or a cookie notice — and the result is unpredictable rather than absent.

og:image has strict requirements

It must be an absolute URL, publicly reachable without authentication, and ideally 1200×630 for the 1.91:1 ratio most platforms crop to. A relative path silently produces no image. So does one behind a login, which is the hardest case to diagnose because it renders perfectly for you while logged in and blank for everyone else.

og:url should be the canonical URL

Platforms use it to consolidate engagement counts, so a page reachable at several URLs accumulates shares against one address only if og:url names it consistently. It should match the rel=canonical, and a mismatch splits the count.

Twitter cards mostly inherit

X falls back to Open Graph for title, description and image, so a separate full set is unnecessary. Only twitter:card is worth adding, choosing summary_large_image for a full-width image rather than the small default thumbnail.

Previews are cached aggressively

Platforms cache scraped metadata, so fixing a tag does not change an already-shared link. Each platform provides a debugger that forces a re-scrape, and using it is the only reliable way to refresh a preview after a correction.