OG checker – how your link looks on LinkedIn, X & Slack

Check for free how your link is displayed on social media. You see the preview for Facebook/LinkedIn, X, Slack and WhatsApp, all tags found and hints about what's missing.

Frequently asked questions

What are Open Graph tags?

Open Graph tags are details in the head of a web page (e.g. og:title, og:description, og:image). Networks like Facebook, LinkedIn, Slack or WhatsApp read them to build the title, text and image of the preview when a link is shared.

What is the ideal image size for og:image?

1200 × 630 pixels are recommended (aspect ratio 1.91 : 1). Many networks show smaller images only as a small thumbnail next to the text, or not at all.

Why do I still see the old preview after a change?

The networks cache previews. Facebook and LinkedIn offer their own tools to re-read a page; Slack and X update on their own after a while. Our result is also cached for up to 5 minutes.

Do I also need Twitter tags?

X also reads Open Graph tags. With twitter:card = summary_large_image you get the large preview with image there, though.

Don't just check once – keep an eye on it permanently

fastry monitors your website regularly and lets you know when something changes.

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