Open Graph
Open Graph is a protocol that uses special meta tags in a web page's source code to define how a link looks when shared. Title, description, preview image and page type are stored in a machine-readable way. Originally introduced by Facebook, today nearly all platforms and increasingly AI systems use these details to display and classify content correctly.
Why Open Graph matters
When you share a link, in WhatsApp, LinkedIn, Slack or on Facebook, a preview card with an image, title and short text usually appears. This card is exactly what you control with Open Graph. Without the right tags, the platform guesses itself, which often goes wrong: a random image, a cut-off title or nothing at all. For you, a clean Open Graph setup means more clicks, because your content looks professional and inviting. For machines, it means clear signals about what the page is about. Open Graph is therefore not a nice-to-have but the business card of your content everywhere that people and systems are presented with your links without opening the page itself.
How it works technically
Open Graph consists of meta tags in the head area (the so-called head) of your HTML page. Each tag begins with the prefix og and carries a value. The four most important are og:title for the title, og:description for the description, og:image for the preview image and og:url for the canonical address. In addition there is og:type, which distinguishes for example between article, product or website. A platform that processes your link reads out these tags and builds the preview card from them. The image should be at least 1200 by 630 pixels so that it does not appear blurry or cropped. You either enter the tags directly in the template or have your content system generate them automatically per page.
Common mistakes
The most common mistake is a missing or far too small og:image, so that the preview stays empty or pixelated. Just as widespread: title and description are identical to the page title, even though you could phrase them more crisply for sharing. A classic is also a relative rather than an absolute image address, since Open Graph requires full URLs with https. Many also forget to clear the platform's cache after changes, which is why old previews stick around. Check your tags with the networks' official debug tools before you rely on them. And make sure every page gets its own values instead of a blanket homepage preview for the entire domain.
Relation to AI recommendations
AI systems and their crawlers read web pages in a structured way in order to summarize and cite content. Open Graph tags give them compact, curated signals: what is the actual title, what is it about, which image represents the page. This does not replace good structured data markup like Schema.org, but complements it. When an AI assistant uses your content as a source, clean og details help ensure that brand, topic and core message are taken over correctly instead of an arbitrary text fragment. In the context of GEO, meaning optimization for generative search, Open Graph therefore belongs to basic technical hygiene. It is an inexpensive, easily implemented building block that improves your citability and recognizability across platforms and AI answers.
Example
Picture a tax advisor who publishes a guide on the small-business regulation. Without Open Graph, LinkedIn only shows the bare URL and a random logo from the footer when sharing. She adds og:title with "The small-business regulation 2026 explained simply", a crisp og:description and a specially designed preview image at 1200 by 630 pixels. From now on, sharing shows a clean card with a clear title, text and image. The click-through rate rises noticeably, because the post looks professional in the feed instead of like a raw technical link.
Common questions
Do I need Open Graph if I already use Schema.org?
Yes, the two complement each other. Schema.org describes content deeply for search engines, Open Graph mainly controls the preview when sharing and gives AI crawlers compact basic signals. Use both.
Why doesn't my preview update after changes?
Platforms cache Open Graph data. Use the network's respective debug or sharing tool to re-read the cache manually. After that, your updated preview card appears.