Tags checked
- Open Graph: og:title, og:description, og:image, og:url, og:type and og:site_name.
- Twitter/X: twitter:card (summary, summary_large_image, app, player), twitter:title, twitter:description and twitter:image.
- og:image must be an absolute https URL; og:url should match the canonical.
How platforms fall back
When Twitter tags are missing, X uses the Open Graph tags. When Open Graph is missing, platforms guess from the title, the description and random images on the page, which rarely looks good. The preview here uses the same fallback order.
Platforms cache previews. After fixing tags, use each platform's debugger to refresh them.
Frequently asked questions
What size should og:image be?
1200 × 630 pixels works on most platforms. Keep text away from the edges; some crop the image to a square.
Do social tags help SEO?
They don't change rankings, but a good share preview gets more clicks from social posts and messages.