Open Graph Preview: How Your Link Looks When Shared

og:title, og:description, og:url, og:image and og:image:alt are recommended by LinkedIn; the tool adds og:type, og:site_name, og:locale and twitter:card for X. X falls back to Open Graph tags, so adding twitter:card is usually enough. Image dimensions (og:image:width/height) are included when the image can be read from its URL.

1200×630 px (a ratio of about 1.91:1) is a safe general guideline, not a requirement of the protocol; LinkedIn recommends at least 1200×627 px and a file of at most 5 MB. Facebook accepts images up to 8 MB, while WhatsApp’s documentation asks for images under 600 KB with a width of at least 300 px. Use an image that still reads well when shrunk, with no important text near the edges where it can be cropped.

Browsers are not allowed to fetch other sites’ pages, so this tool cannot check a URL automatically. Instead, copy the page source (View Source) and paste it into the HTML field; the tool reads og:*, twitter:*, title, meta description and the canonical link right in your browser. Missing tags are reported, and empty fields are filled from fallback tags where available.

Note that what is read is the HTML you paste. If a site adds its tags with JavaScript, copy the result from “Inspect” (the rendered elements), but remember that crawlers such as facebookexternalhit do not run JavaScript, so the tags must be in the initial HTML.

Facebook, LinkedIn, X, WhatsApp, Slack and iMessage change their layout and text cut-off limits without notice, and they cache old results. Slack, for example, caches results for about 30 minutes. After you update your tags, clear the cache with each platform’s official tool (for example Facebook’s Sharing Debugger and LinkedIn’s Post Inspector), then test the real link.

Slack and iMessage do not publish detailed image size specifications, so their cards here are only a rough idea. If you enter an image URL, your browser loads it directly from the owner’s site for the preview. An image chosen from your device is not uploaded.