Open Graph is a protocol for describing a web page as a rich object when it is shared or consumed in a social graph. You add its metadata as tags in the page’s HTML <head>; the core fields identify the page’s title, type, representative image and canonical URL. Those tags give services information to use when presenting a link, but do not guarantee that every platform will display an identical preview.
What Open Graph means
The Open Graph Protocol describes metadata that lets a web page be represented as a rich object in a social graph. Its documentation puts it this way: “The Open Graph protocol enables any web page to become a rich object in a social graph.” In practical terms, a publisher supplies information about a page so a service that consumes or displays its link can identify the page and its intended title and image.
Open Graph is not the page itself, nor is it a guarantee about how a specific service will render a shared link. It is a set of metadata conventions. A service must fetch and interpret those tags, and each service can have its own parsing and display behavior. The available documentation does not establish identical handling across all sharing platforms.
The protocol uses HTML <meta> elements, normally placed in the document’s <head>. The tags use a property name such as og:title and a content value. The official specification is at ogp.me; web.dev also describes Open Graph metadata in its overview of social discovery.
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The four basic Open Graph properties
The protocol identifies four basic properties for every page. Together, they say what the object is called, what kind of object it is, which image represents it and which URL identifies it.
| Property | Purpose | How to think about it |
|---|---|---|
og:title |
The title to display for the object. | The page’s share-facing title. |
og:type |
The kind of object. A chosen type can require additional properties. | The classification for the object; website is one example. |
og:image |
The image that represents the object. | The image a consuming service can associate with the shared page. |
og:url |
The canonical URL used as the object’s permanent ID in the graph. | The preferred identity URL for the object. |
The protocol’s example puts all four in the head and declares the Open Graph namespace on the HTML element. Its values are illustrative rather than platform-specific recommendations:
<html prefix="og: https://ogp.me/ns#">
<head>
<meta property="og:title" content="Example page title" />
<meta property="og:type" content="website" />
<meta property="og:url" content="https://example.com/page/" />
<meta property="og:image" content="https://example.com/share-image.jpg" />
</head>
</html>Use values that describe the actual page you are marking up. In particular, og:url is not simply decorative: the protocol defines it as the canonical URL and permanent identifier. Ensure it points to the intended canonical page, rather than an unrelated page or a URL variant that you do not want treated as its identity.
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Optional properties that add context
The four core fields establish the basic object. The protocol also documents optional properties that can provide more context, including a description, locale, site name, audio and video. Optional does not mean every page needs every field; include properties that accurately describe the object and suit your content.
| Property | What it adds |
|---|---|
og:description |
A one- to two-sentence description of the object. |
og:locale |
The language-and-territory locale for the object. The protocol documents en_US as the default. |
og:locale:alternate |
An alternate locale. |
og:site_name |
The name of the broader site. |
og:audio and og:video |
Audio or video associated with the object. |
Images have structured properties of their own. The specification documents og:image:secure_url for an alternate HTTPS image URL and og:image:type for the image MIME type. It also describes image dimensions and alternate text as structured metadata. These properties can supplement og:image; they do not change the role of the core image property.
For a localized site, set locale information to match the content rather than mechanically copying the documented default. Likewise, use a description that accurately summarizes the page and media properties only when the object actually has that media. The protocol defines the available metadata; it does not establish how every service will use every optional field.
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How to add Open Graph tags to a page
- Choose the page’s canonical identity. Decide the exact URL that should identify this object, then use it as the
og:urlvalue. - Write the share-facing title and description. Set
og:titleto the title intended for the object and, if useful, add a conciseog:description. - Select a representative image. Set
og:imageto the image URL that represents the page. Add documented image properties, such as MIME type or dimensions, when applicable. - Choose the object type. Set
og:typeto an appropriate type. The protocol notes that a chosen type can require additional properties, so check its documentation when selecting a more specific type. - Place the tags in the document head. Add the metadata to the page’s HTML output, not merely to visible body content. A basic implementation can look like this:
<head>
<meta property="og:title" content="What Is Open Graph?" />
<meta property="og:type" content="website" />
<meta property="og:url" content="https://example.com/guides/open-graph/" />
<meta property="og:image" content="https://example.com/images/open-graph-guide.jpg" />
<meta property="og:description" content="Learn what Open Graph metadata does and how to add it to a page." />
<meta property="og:locale" content="en_US" />
<meta property="og:site_name" content="Example" />
</head>This snippet demonstrates the property and content form; the domain, copy, image and locale are examples, not values to copy blindly. In a content management system, template, or server-rendered application, edit the mechanism that outputs the page’s head so that the right values appear on the page in question.
How to check the result
Start by inspecting the page’s delivered HTML and confirming that the intended Open Graph properties are present in the head with the expected values. Check each page independently if titles, canonical URLs or images vary by page. If a site generates metadata dynamically, inspect the actual page output rather than assuming that a value entered in an editor was emitted correctly.
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The Open Graph Protocol documentation identifies the Facebook Object Debugger as a parser and debugger. The source material does not establish its current interface, nor does it establish current requirements for every platform. Use the relevant service’s own preview or debugging facility when you need to assess that service’s interpretation, and avoid treating one parser’s output as proof that every other service will behave the same way.
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A screenshot can help you inspect a rendered page visually, but it cannot by itself confirm that Open Graph tags exist or that a sharing service parsed them. For metadata checks, inspect the HTML or use a relevant parser; use a screenshot only as a complementary view of the page.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Common implementation problems
- A tag is missing from the page head. Check the final HTML output, not just the template or CMS field where you entered the value. Correct the component that emits the page metadata.
- The shared title, image or description is not the intended one. Compare the tag’s
contentvalue with the page’s intended share data. Check for conflicting or incorrectly populated metadata in the output. - The URL identifies the wrong page. Revisit
og:urland set it to the canonical URL intended to serve as the object’s permanent identity. - A type-specific setup appears incomplete. Check the Open Graph Protocol documentation for properties associated with the selected
og:type; the protocol says some types require additional properties. - Different services show different previews. The protocol supplies metadata, but the sources do not establish uniform platform behavior. Verify the page with the relevant service instead of assuming one preview predicts all others.
- A screenshot looks right but the share data is wrong. Visual rendering and metadata are different checks. Inspect the head markup or use a parser to validate the metadata itself.
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What Open Graph does—and what it does not promise
Open Graph gives publishers a defined way to describe a page as an object, including its title, type, image and canonical URL. Optional properties can add description, locale, site, audio or video context. Correct metadata is a useful input for services that consume shared links, but it does not guarantee a particular appearance or identical behavior everywhere. For that reason, treat markup validation and platform preview checks as separate tasks.
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