Open Graph Checker

Open Graph is a set of meta tags that social networks and messengers use to build a link card: the title, the description, and the image. A network's robot reads the tags, while a human never sees them, so a breakage goes unnoticed: the page opens as usual, but the link in a chat shows up as a bare URL with no image.

What we check

• The core tags: og:title, og:description, og:image, og:url, og:type, and twitter:card. If a tag is missing, we show what the network will fall back to: the page title or the meta description.
• The image itself. We follow the URL from og:image and look at the server response, the format, the file size, and the actual dimensions in pixels. A broken image link is the most common reason a card fails to build.
• Duplicate tags. When og:title appears twice with different values, the network takes the first one, and that is usually not the one you edited last.
• Tags outside the head block, and og tags written with name instead of property.
• Whether the page is closed off in robots.txt for the robot of the network you share the link with.

Why choose a robot

Each network sends its own robot to fetch the card: Facebook uses facebookexternalhit, Telegram uses TelegramBot, VK uses vkShare. Anti-bot protection on a site often lets a browser through and turns the robot away. A browser check shows such a page as healthy, even though no network can build its card. So by default we come as the robot, and if the site turns the robot away, we come back as a browser and show you the difference.

The card does not update after an edit

Networks cache a page's markup and stop fetching it on the next share. Editing the tags does not update links already sent out: you have to ask the network to re-read the page. Under the check results, the tool lists the cache-reset links for each network.

Checking a list

The form has a mode for a list of URLs, up to 100 pages at a time. For each page you see which tags are missing and whether the image opens, and across the whole list the tool finds duplicate titles and a single default image for the entire site. The results export to CSV.