Free Link Preview Checker
See how a page looks when it is shared, and get the tags that fix it
How link previews work
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When someone shares a link, the app fetches the page and reads a few tags in its head, called Open Graph tags, to build the preview card. If the tags are missing, the app guesses, and the guess is usually a bare link or the wrong picture.
The four tags that matter
og:title, og:description, og:image and og:url. Almost every network and messaging app reads these, including Facebook, LinkedIn, WhatsApp, iMessage, Slack and Discord.
The picture
1200 by 630 pixels works everywhere. Use the full address starting with https://, keep the file under about 5 MB, and keep important text away from the edges, because some apps crop to a square.
X needs one more tag
X reads the Open Graph tags too, but only shows the large picture when the page also has twitter:card set to summary_large_image.
Why an old preview keeps showing
Networks keep a copy of the preview, sometimes for weeks. After fixing your tags, ask each network to fetch the page again with its own tool: Facebook's Sharing Debugger and LinkedIn's Post Inspector both do this.
Fallbacks
Without og:title a network uses the page title; without og:description, the meta description. The previews above show what you get after those fallbacks, which is what your visitors will see.
What this cannot show
The exact pixels. Every app styles its cards a little differently and changes them often. The previews here show the content each app will use, in roughly its layout.
The page is read as a crawler receives it, without running scripts, which is also how the networks read it. Tags added by scripts after the page loads are not seen by them, or by this tool.
Guide: link previews and Open Graph tags
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