Paste any URL. See how it renders as an OG / Twitter Card on X, LinkedIn, and Slack/Facebook. Catch broken images, missing descriptions, and 1.91:1-aspect-ratio surprises before you publish.
The OG image is the first impression. It's bigger than the headline in the feed and it's the only thing that loads instantly. A page with a broken or missing OG image gets a fraction of the click-through rate — even when the content is identical.
The three preview cards above mirror the rendering behaviour of X (1.91:1 summary_large_image), Facebook / LinkedIn / Slack (1.91:1 OG with site name + URL host), and the canonical OG card. Make the image readable at 600×315, keep the title under 70 chars, and the description under 160. Both Facebook and LinkedIn truncate beyond that.
If your page is missing OG markup entirely, drop a few lines into <head> — at minimum og:title, og:description, og:image, plus twitter:card content="summary_large_image".