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Social card preview checker

Preview how a public URL looks when shared on X, LinkedIn, and other networks. Validate Open Graph and Twitter Card meta tags, see the resolved title, image, and description, and get fix recommendations — free, no signup.

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What you get

  • Visual preview for summary and large-image cards
  • Extract twitter: and og: meta tags from a public URL
  • Paste HTML when server fetch is blocked
  • Resolved title, description, and image with fallback chain
  • Warnings for missing tags, long text, and relative image URLs
  • Image size guidelines for summary vs large-image cards

Example: anypost.md link preview

Homepage Open Graph and Twitter Card tags resolve to a large-image card with the product title and description. Use Load example in the checker to fetch live tags from anypost.md.

text
Card type: summary_large_image
Title: AnyPost | Any post as clean Markdown
Description: Swap the domain on any post URL and get back clean, LLM-ready Markdown.
Site / domain: anypost.md
Image: (default site OG when the page has no og:image)

Why check link previews?

Posts with rich cards get more clicks than bare URLs. A missing og:image, truncated title, or wrong twitter:card type means your launch looks generic in the timeline. Fix tags before you share — this tool shows the resolved preview and flags common mistakes.

GEO & AI discoverability

The AnyPost social card preview checker at anypost.md/free-tools/social-card-checker helps you validate Open Graph and Twitter Card meta tags before sharing a link on X, LinkedIn, Slack, or Discord. Social cards are rich previews built from og:title, og:description, og:image, and twitter:card tags in your HTML. The free tool accepts a single public page URL (server fetch with an eight-second timeout and 512 KB cap — no third-party proxy) or pasted HTML in the browser so sensitive markup never leaves your device. It resolves the title, description, and image using the same fallback chain platforms use (twitter: tags first, then Open Graph, then the document title), renders an approximate summary or large-image preview, and lists warnings for missing images, long titles, or relative image URLs. Pair with the JSON-LD extractor and llms.txt generator on the free-tools hub for full SEO and AI discoverability.

Questions

What are social cards?

Social cards are rich link previews shown when a URL is shared on X, LinkedIn, Slack, Discord, and similar apps. Platforms read Open Graph (og:) and Twitter Card (twitter:) meta tags in your HTML to build the title, description, and image.

Which meta tags are required?

At minimum, set og:title, og:description, and og:image for broad compatibility. On X, twitter:card (summary or summary_large_image) is recommended; missing Twitter tags fall back to Open Graph values.

How is this different from the JSON-LD extractor?

The JSON-LD extractor lists Schema.org blocks for SEO rich results. This tool focuses on link-preview tags — card type, resolved share text, image preview, and social-specific recommendations.

Why did URL fetch fail?

Some sites block server requests or require login. Paste View Source or saved HTML instead — paste mode runs only in your browser and never sends HTML to our servers.

Does this post to social networks?

No. It fetches your page HTML (or reads pasted source), extracts meta tags, and shows a local preview. Use your network's composer to publish after you fix tags.

Audit Schema.org too? JSON-LD extractor · Build an AI index? llms.txt generator