Free tool
Link preview checker
Paste any public URL. We fetch the page, read its Open Graph and Twitter tags, and show the card most platforms will build from them.
Why cards break
Social platforms and messengers do not render your page. They fetch it once, read a handful of meta tags, and build a card from whatever they find. If the tags are missing, the platform guesses from the title and the first image it can reach, and the guess is usually worse than what you would have chosen.
Short links inherit the card of their destination, because the redirect is followed before the tags are read. That is why a branded short link shared on social looks exactly like the page behind it — see link shortening for how the redirect is served.
Caches and re-scrapes
Every large platform caches what it fetched, often for days. Fixing a tag does not fix a card that has already been shared: the platform keeps serving the version it stored. Most of them publish a debugging tool that forces a re-scrape, and using it right after a fix is the difference between a corrected card and a wrong one that circulates for a week.
This checker never caches: every run is a fresh fetch with a short timeout and a size limit, so what you see is the current state of the page rather than a stored copy.
Frequently asked questions
Which tags does this read?
og:title, og:description, og:image, og:url, og:site_name and og:type from the Open Graph vocabulary, plus twitter:card, twitter:title, twitter:description and twitter:image. When an Open Graph tag is missing, the checker falls back to the HTML title element and the standard meta description, which is roughly what platforms do, and marks the value as a fallback.
What image size should I use?
1200 by 630 pixels is the safe answer: it satisfies the large-card layouts on every major platform and crops cleanly to the smaller ones. Keep the file under about one megabyte, use PNG or JPEG rather than WebP if you care about older clients, and make sure the image is reachable without a login or a redirect.
Do short links break previews?
No. Crawlers follow redirects before reading tags, so a short link shows the card of its final destination. The one thing that does break previews is a destination that requires a session or blocks unknown user agents, because the crawler is neither logged in nor recognised.
The page has tags but the checker shows none. Why?
Most often because the tags are added by JavaScript after the page loads. Crawlers read the HTML as it arrives from the server and do not run your scripts, so client-rendered tags are invisible to them and to this tool. Render them server-side, or place them in the initial HTML.
Own the link and the card
Branded domains, custom slugs and previews that carry your name.
No card required for the trial.