Paste a URL to preview exactly how it renders as a card when shared on X — free, instant, no signup.
It reads the page's twitter:* meta tags (falling back to Open Graph tags the same way X itself does) and checks that a card type is set, that a title, description, and image are all available, and that the image is a full absolute URL rather than a relative path X can't resolve.
Add or fix the flagged tags directly in your page's <head>, then run the same URL through this tool again to confirm the fix landed and check the preview.
X (formerly Twitter) shut down its official Card Validator tool, leaving no first-party way to check how a link will render before posting it. This tool fills that specific gap using the same tags X itself reads.
summary shows a small square thumbnail beside the text; summary_large_image shows a full-width image above it — the one most sites want for a link post. app and player are for linking directly to an app store listing or an embedded video/audio player.
X falls back to your og:title, og:description, and og:image tags for any field you haven't set a twitter:-specific version of, as long as a twitter:card tag is present. This tool checks both and shows you which one actually wins, rather than only looking at twitter:* tags in isolation.
Not necessarily — this preview loads the image directly from your server the same way a browser would, so a slow host, a blocked hotlink policy, or a very large image can all cause it to fail to load here even though it renders fine everywhere else. Check the image URL directly in a new tab if you're unsure.
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