Enter a public URL and this tool reads the page's Open Graph and Twitter Card tags, then reports which social-preview tags are present and which are missing.
Pro tip: An og:image set to an absolute URL is what makes shared links show a thumbnail, so prioritize fixing it.
Unlike the generators on this site, this checker does not work from values you type or HTML you paste. You give it a URL and it reads the actual page, so what you see reflects the tags a social platform's scraper would encounter when someone shares that link.
That makes it the right tool for debugging a preview that looks wrong in the wild — the answer is almost always a tag that is absent, duplicated, or pointing at the wrong resource on the live page rather than a problem with the platform itself.
You submit a URL and the tool retrieves the page over HTTP and parses its <head> for the og: and twitter: tag families, then summarizes the results as a present-versus-missing breakdown.
Because the request is made for you rather than from inside your own logged-in browser session, the page must be publicly reachable. URLs behind a login, on localhost, or actively blocked to automated requests cannot be inspected.
Use it the moment a shared link looks broken — no thumbnail, the wrong headline, or an old image that should have changed. The checker tells you immediately whether the underlying tags are the cause.
It is also useful as a pre-launch step: run it on a new page before you announce it anywhere, so the first people who share the link see a complete card rather than a bare URL. Checking a competitor's page is a quick way to see how they structure their own share metadata.
A missing og:image is the most common result and the most visible, because it strips the thumbnail from every share. Adding an absolute-URL image around 1200x630 usually fixes it. A missing twitter:card means X may fall back to Open Graph or show a plain link, so add twitter:card set to summary_large_image for a banner.
If the values are present but wrong — an outdated title or a stale image — fixing the tag is only half the job; you then refresh the platform's cache. The checker confirms the markup; it cannot force a platform to re-read it.
It reports the tags as the fetch sees them at that moment. If your page builds Open Graph tags with client-side JavaScript that only runs in a full browser, those may not appear in the fetched HTML — and notably, many social scrapers would miss them too, which is itself useful to know.
It does not clear a platform's preview cache. After you fix a tag you still refresh the card inside each platform's own sharing debugger. The checker diagnoses the markup; it cannot make Facebook or X re-scrape on demand. Note: this tool reads a public page on your behalf, so only submit URLs you are comfortable retrieving.
Input: URL: https://example.com
Output: OG tags: 0. Twitter tags: 0. Key tags present: 0/6 — og:title, og:description, og:image, og:url, og:type, and twitter:card all report (missing). The summary still notes a detected share title of "Example Domain", which it reads from the <title> element as a fallback.
Measured 2026-07-17. example.com is the IANA-reserved placeholder page, so it is a clean baseline for what a page carrying zero Open Graph markup looks like.
Input: URL: https://en.wikipedia.org/wiki/Search_engine_optimization
Output: OG tags: 2. Twitter tags: 0. Key tags present: 2/6. og:title reads "Search engine optimization - Wikipedia" and og:type reads "website", but og:description, og:image, and og:url all report (missing), as does twitter:card. Shares of this URL therefore render without a thumbnail.
Measured 2026-07-17. A live page's tags can change at any time, so re-run the check rather than assuming this snapshot still holds.
Input: URL: https://developer.mozilla.org/en-US/docs/Web/HTML
Output: OG tags: 10. Twitter tags: 2. Key tags present: 5/6. og:title, og:description, og:url, and og:image (https://developer.mozilla.org/mdn-social-image.46ac2375.png) are all present, alongside og:locale, og:site_name, and four og:image:* refinements; twitter:card reads "summary". The one key tag reported as (missing) is og:type.
Measured 2026-07-17. The image filename carries a build hash and the tag set can change between MDN deploys, so treat these values as a snapshot.
The generator writes new tags from fields you type. This checker reads an existing live URL and reports the tags already on it. One builds, one audits.
No. The page is fetched over the public internet, so the URL must be publicly accessible. A localhost or staging URL behind authentication will not resolve.
Often the tags are injected by JavaScript that the fetch does not execute, or the site blocks automated requests. Note that many social crawlers behave the same way.
No. It diagnoses the markup. To refresh a cached card after fixing tags, re-scrape the URL in the relevant platform's sharing debugger.
The core Open Graph set (og:title, og:description, og:image, og:url, og:type) and the main Twitter Card tags (twitter:card, twitter:title, twitter:description, twitter:image).
Because a tag can exist yet be wrong. Seeing the actual title and image lets you catch a stale headline or the wrong thumbnail, which a simple presence check would miss.
I document how each check works, where its data comes from, and which parts are only estimates.