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A page passes through doors it will never see — a message, a feed, a stranger's screen. These tags are the face it wears at each crossing. Leave them blank and the doorkeeper picks your face for you, usually a poor one. Write them, and you choose how you arrive. Arrivals matter.
— Janus, at the door
Glossary
Glossary

Open Graph

Open Graph is a small set of labels you add to a web page that decide how the page looks when someone shares it. You have seen its work a thousand times without knowing the name: paste a link into a message, a chat, or a social post, and up pops a little card — a headline, a line of description, a picture. That card is not guesswork. It is assembled from Open Graph tags, and if they are absent, the machine building the card falls back to grabbing whatever it can, which is usually a mess.

The tags themselves live in the invisible part of the page — the same quiet region as your schema — and never show to a human reading the site. Each is a short line naming one thing: a title, a description, an image, the page's proper address. When a link is pasted anywhere, that platform sends its own reader to fetch the page, finds these lines, and builds the preview from exactly what they say. The picture does the heaviest lifting; a good one can roughly double how often a shared link is actually clicked. Introduced by Facebook in 2010, the convention spread until nearly every platform — messaging apps, social networks, workplace chat — came to rely on it.

Two things reliably go wrong. The first is simple absence: no tags, so every share of your page produces a broken or unflattering card, and you never see it because it only appears on someone else's screen. The second is staleness. Platforms remember the first card they build and hold onto it, so fixing your tags after a link has already circulated may not update the old preview — the major platforms offer a debugger to force a fresh read. There is also a right size for the image, near 1200 by 630 pixels, below which platforms crop awkwardly or shrink your card to a thumbnail. Whether your own homepage gets this right is easy to check — Limen's free Open Graph checker fetches the page and shows you the exact card each platform will build from its tags, before a stranger ever sees it.

The human translation is this. Open Graph is not about whether your link can be shared — it always can. It is about whether you decide what people see when it is. Left blank, the moment of sharing is out of your hands: the platform picks a headline and a scrap of an image on your behalf, and first impressions of your page are made by a machine's rough guess. Filled in with care, that same moment becomes yours — the card that represents you in a stranger's feed says precisely what you meant it to.