Add og:image:alt so screen readers can describe the preview image on X and Facebook.

og:url is one of the four required Open Graph properties. Facebook uses it to pool shares of the same page across tracking parameters and variant URLs.

og:type is required by the Open Graph spec. Most pages should declare "website"; use "article" for posts.

Declare the language of the preview text, e.g. en_GB. Platforms assume en_US without it.

"Next.js Conf 2025" — 17 characters.

17 characters — within the 60-character target.

"Next.js Conf 2025" — 17 characters.

37 characters — within the ~125-character social preview target.

37 characters — within the search snippet range.

og:image is present and ready for social previews.

47 KB — under the 1 MB recommendation.

1200×628 detected is 1.91:1 — close enough to the 1.91:1 target to render uncropped.

summary_large_image is set, so X can render the image at full card width.

22 characters — ready for X previews.

37 characters — ready for X previews.

twitter:image is present and ready for the X preview.

"Next.js Conf 2025" — Discord and similar apps show this as the site label.