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MakerRadar

Free tool

Open Graph checker & social card preview

Paste a URL and see the card X, LinkedIn, Facebook and Slack will show when someone shares it — and why it might show no image at all.

Any public page — we read its tags and fetch the image they name, as the networks do.

How do I check how my link looks when shared?

Open Graph tags (og:title, og:description, og:image) in a page's head decide the card a shared link shows on Facebook, LinkedIn and Slack, and on X as a fallback for its own twitter: tags. A preview reads those tags and the image the way the networks do.

What it checks

  • og:title and og:description, and how much of each a card shows

  • og:image — present, reachable, and its real size in pixels (1200 × 630 is the target)

  • The X card type (summary_large_image for a big image)

  • og:image:alt, so the image is described to people using screen readers

  • og:url, the address the share counts towards

Use it from your AI assistant

Claude, ChatGPT, Cursor and any other MCP client can run this check for you. Add the server below, then ask it to check a site: the tool is preview_social_card. No sign-up and no key.

https://api.makerradar.io/mcp

Or call the REST API, which answers the same report as JSON:

curl -X POST https://api.makerradar.io/v1/tools/social-card-preview \
  -H "content-type: application/json" -d '{"url":"https://example.com"}'

MCP server guide · API reference

Get a page that passes, free

Every product on MakerRadar gets a permanent page with a clean title and description, structured data, an FAQ, a Markdown version for AI assistants and a place in our llms.txt — and a backlink you can earn.

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Frequently asked questions

Why does my link show no image when I share it?

Usually the page has no og:image tag, the image URL is relative or behind a login, or it's too small: X and LinkedIn drop images under about 300 pixels wide, and Facebook prefers 1200 × 630. The preview fetches the image the way they do and tells you which.

Which tags do X, LinkedIn and Slack read?

All of them read Open Graph (og:title, og:description, og:image). X adds twitter:card and falls back to Open Graph for the rest; without twitter:card it shows a small card.

I fixed the tags — why does the old card still show?

Each network caches a card for days. After a fix, ask it to read the page again: LinkedIn's Post Inspector and Facebook's Sharing Debugger both have a re-scrape button; X refreshes on its own within about a week.