67 characters — keep it under 60 so platforms don’t truncate the headline.

167 characters — aim for ~125 so mobile previews don’t cut it off.

167 characters — Google usually truncates around 150–160 characters in results.

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

Add twitter:site with your @handle so X can credit the account on the card.

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

"Spline - 3D Design tool in the browser with real-time collaboration" — 67 characters.

"Spline - 3D Design tool in the browser with real-time collaboration" — 67 characters.

og:image is present and ready for social previews.

46 KB — under the 1 MB recommendation.

1200×600 detected is 2.00:1 — 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.

67 characters — ready for X previews.

167 characters — ready for X previews.

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