Free Online Twitter Card Checker

A Twitter Card checker parses pasted HTML, extracts the twitter: meta tags, previews the card and validates the card type and required properties.

Your data is processed entirely in your browser and never sent to any server.

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How to Use This Tool

  1. Copy the page's HTML source and paste it into the input box.
  2. Check the detected card type is valid (summary or summary_large_image for most pages).
  3. Review the preview — the layout matches the card type automatically.
  4. Resolve any warnings about a missing twitter:title or twitter:image.
  5. Optionally add twitter:site with your @handle for brand attribution on the card.

What Is a Twitter Card Checker?

Twitter Cards (used on X) turn a shared link into a rich preview. The card type is set by twitter:card and is one of four values: summary (a small square thumbnail), summary_large_image (a large banner), app or player. Articles and pages typically use summary or summary_large_image. The card draws on twitter:title, twitter:description and twitter:image, and twitter:site optionally attributes it to a @handle.

When Twitter-specific tags are absent, X commonly falls back to the equivalent Open Graph tags — og:title, og:description and og:image — so a page with good Open Graph markup may still render a card. This checker reads the HTML you paste, lists the twitter: tags, applies the Open Graph fallback where appropriate for the preview, validates that the card type is one of the recognised values, and warns when twitter:title or twitter:image (or a usable fallback) is missing.

The rendered preview switches between the compact summary layout and the large-image layout based on the detected card type, so you can see what followers will see. Everything runs client-side on pasted source, so unpublished pages are fine to test.

Frequently Asked Questions

What card types are there?
summary (a small square thumbnail), summary_large_image (a large banner image), app and player. Most sites use summary or summary_large_image for articles and pages.
Does X fall back to Open Graph?
Yes. When Twitter-specific tags are absent, X often falls back to og:title, og:description and og:image. Setting both gives you the most control over the preview.
What does twitter:site do?
It attributes the card to a username, shown as "via @handle" on some cards. It is optional but useful for brand attribution; the checker reports whether it is present.

Published by the WeGotEveryTool team. We build and test every tool in-house and update pages when the underlying spec, formula, or recommendation changes.

Reviewed: May 2026. Disclaimer: this tool is provided as-is for general informational use. For decisions with material consequences (medical, legal, financial, security) verify results against a qualified professional source.

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