Free tool · no signupOpen Graph checker
Paste any URL to see the Open Graph and Twitter Card tags a crawler reads, what's missing, and exactly how the link will render on X, LinkedIn, Facebook, Discord, Reddit, and Bluesky.
What this checks
A link preview is assembled from a handful of meta tags in your page's <head>. Get them right and every platform renders the card you intended. Miss one and each platform improvises differently, which is why the same link can look correct on X and broken on LinkedIn.
This tool fetches your page the way a social crawler does, reads every og: and twitter: tag it finds, then downloads your og:image to confirm it is actually reachable and measure its real dimensions. It grades the title and description against the lengths each platform truncates at, checks that og:url matches the page it is on (a mismatch is the most common reason LinkedIn refuses a preview), and flags the image problems that silently downgrade a full-width card to a thumbnail.
The specification itself lives at ogp.me, and each platform layers its own rules on top. If you want the full picture, start with Open Graph tags explained and the image sizes guide.
Platform quirks worth knowing
- X (Twitter)
- Needs
twitter:cardset tosummary_large_imagefor the full-width card. Without it you get a small square thumbnail no matter how good your image is. Read more - Caches previews for roughly seven days and shows no description at all on inline cards, so your title carries the whole message. A mismatched
og:urlwill make it reject the preview outright. Read more - Keys its cache on
og:url, which means pages sharing a value share a preview. It also gives up on very large images. Read more - Discord
- One of the few platforms that renders your description in full, and it respects
theme-color. Good tags look noticeably better here than anywhere else. Read more
Frequently asked questions
- What is an Open Graph checker?
- An Open Graph checker reads the meta tags in a page's HTML head and shows you what social platforms will do with them. Open Graph is the protocol behind every link preview card you've seen on X, LinkedIn, Facebook, Discord, and Slack. If the tags are missing or malformed, the platform guesses, and the guess is usually a bare URL or a stray logo.
- Why does my link preview show the wrong image?
- Almost always one of three things: there is no og:image tag so the platform picked an image off the page at random, the og:image URL is relative or unreachable so the crawler got nothing, or the platform cached an older version of the page. Facebook and LinkedIn both cache aggressively and key that cache on og:url, so a missing or mismatched og:url makes several of your pages share one preview.
- What size should an Open Graph image be?
- 1200×630 pixels. That is a 1.91:1 ratio, which is what every major platform crops to, and it is large enough that nobody downgrades you to a small square thumbnail. The hard floor is 600×315 — below that, X and Facebook render the compact card instead of the full-width one. Use PNG or JPEG; no major platform renders SVG previews.
- Does this tool cache results?
- No. Every check fetches the page live, so you see what a crawler would see right now. That makes it useful for confirming a fix landed, though bear in mind the platforms themselves still hold their own caches and may need to be nudged with their own debuggers.
- Can I fix the preview for a page I don't own?
- Not by editing its tags, because you can't. This is the common case for affiliate offers, partner content, and news articles. What you can do is share a Prelinq link instead: it carries the title, description, and image you choose, and forwards the visitor to the original page.