Check the share card before posting
The link preview is your landing page's first impression — see what the OG tags produce before sharing.
Tools used in this guide
The job
Paste a page's head markup or type the og:/twitter: fields; the preview approximates the card chat apps and timelines render — title, description, image, site name.
Paste or fill
The extractor reads og:title, og:description, og:image, og:site_name, twitter:card and friends from pasted HTML; missing fields show as gaps in the card.
Worked example
A post missing og:image renders a text-only card — the usual reason a link looks dead in Slack. Setting og:description long past ~200 chars shows where it truncates.
Where it stops
A layout approximation: each platform crops images differently and Discord/Slack/X all diverge in detail. og:image URLs are shown but not fetched.