Twitter Card Validator: Preview X Cards Now
X's own Card Validator is no longer a practical way to preview cards, so this tool does the job: enter a URL and we fetch it as Twitterbot, check the twitter:card type and the Open Graph fallbacks, measure the image and show how the card will look on X. Most pages need just one X-specific tag.
We request the page with X's Twitterbot user agent and build the preview from exactly what it receives. Free, no signup. Updated Oct 24, 2026 by the AEOeye team.
Twitter Card Preview: How Your Link Looks on X
X builds a card from your page's tags when someone posts the link. The twitter:card tag picks the layout; title, description and image come from twitter: tags or, if those are missing, from Open Graph tags.
| twitter:card | Layout |
|---|---|
| summarylargeimage | Large image above the link — what most sites want |
| summary | Small square thumbnail beside the text |
| player / app | Video players and app installs (special cases) |
So the minimum for a big-image card is one tag on top of your Open Graph set: <meta name="twitter:card" content="summary_large_image">.
X Card Validator: Fix summary_large_image Errors
Most broken cards come from four problems: no twitter:card tag (X falls back to a small summary at best), an image X can't fetch, an SVG image, or a page that returns an error to Twitterbot. The checker tests each one.
What happened to the official Card Validator?
X's old validator page now sends logged-out visitors to a login screen instead of showing a preview. X's developer documentation for cards has also moved: when we checked on October 24, 2026, the old card docs URLs redirected to a general docs overview. Image requirements are now best inferred from the Open Graph standards platforms share: 1200×630 at 1.91:1 works for X, Facebook and LinkedIn alike.
How common are X cards?
Very. In our October 2026 analysis of 315 big-brand homepages (dataset), 82.5% set a twitter:card tag: 74.3% chose summary_large_image and 7.3% summary.
Why does X still show my old card?
X caches cards. After you fix tags, the old preview can persist on existing posts; new posts usually pick up the change. Adding a query string such as ?v=2 to the shared URL usually makes X fetch the page again.
To see your link on six platforms at once, use the link preview tool. To check every og: tag in depth, use the Open Graph checker.
One page checked. What about the rest of your site?
The free SEO audit crawls your site and scores ~90 checks across 7 areas — with the evidence and the fix for each problem.
FAQ
Does X still have a Card Validator?
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The old cards-dev.twitter.com page now sends logged-out visitors to a login screen rather than showing a preview. This tool fetches your page as Twitterbot and renders the card for anyone, no account needed.
Do I need twitter:title and twitter:image if I have Open Graph tags?
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Usually not. X falls back to og:title, og:description and og:image. Add twitter: versions only when you want X to show something different from other platforms.
What image size works for summary_large_image?
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A 1200×630 image at roughly 2:1 to 1.91:1 works well on X and doubles as your Open Graph image for Facebook and LinkedIn. Use PNG, JPEG or WebP, not SVG.
Sources
Related free tools
Link Preview
Free link preview tool: see how a URL looks on Facebook, LinkedIn, X, Slack, Discord and iMessage — from the tags each platform actually reads.
Open Graph Checker
Free Open Graph checker: validate og:title, og:description, og:image, og:url and og:type on any URL, catch broken tags and see the fix for each.
OG Image Checker
What OG image size works? 1200×630 px. Check your og:image dimensions, file size, format and crop on Facebook, LinkedIn, X and Slack in one click.
Facebook Sharing Debugger
See what Facebook scrapes from your URL: we fetch it as facebookexternalhit, show the og: tags and image it uses, and explain how to force a re-scrape.