This free Open Graph preview tool shows how your link looks when someone shares it, before they share it. Paste a URL and it imports the tags the page already has, then renders the card as LinkedIn, Facebook and X would draw it. Edit the tags and the preview updates as you type. It runs online with no account and nothing to install.
Open Graph is the most ignored high impact thing on a website. Across 500+ projects, roughly half the sites I audit have no og:image at all, which means every link anyone posts to a WhatsApp group or a Slack channel renders as a grey rectangle with a URL under it. Nobody clicks a grey rectangle. It takes ten minutes to fix and nobody had ever looked, because the tags are invisible on the page itself. You only see the damage somewhere else, in someone else's feed.
The trap that follows is caching. You fix the tags, re-share and see the same broken card, then assume it did not work. It did. The platform is showing you what it scraped days ago. Set the tags properly with the free meta tag generator, get the dimensions right with the social media image size guide, then browse the rest of the free SEO tools.
A few things decide whether a preview shows at all. The og:image URL has to be absolute and publicly reachable, no login wall, no robots block and a valid certificate, because every platform fetches it from the outside. Keep your headline and logo inside the middle two-thirds of the frame, since each service crops the edges a little differently. And when a card looks wrong after you fix the tags, the culprit is almost always a cached old version, so run the page through Facebook's Sharing Debugger, the LinkedIn Post Inspector and the X Card Validator to force a fresh scrape, or append a version to the image URL. One 1200 by 630 image plus a twitter:card value of summary_large_image covers nearly every place a link gets shared.
