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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11og:image:alt is Open Graph metadata that describes the content of the page’s associated sharing image. It belongs in the page’s <head>, alongside og:image. The Open Graph Protocol calls it “A description of what is in the image (not a caption)” and recommends specifying it whenever a page specifies og:image.
What og:image:alt does
When a page includes an og:image property, og:image:alt supplies a textual description of that particular image. The Open Graph Protocol defines it as a structured property of og:image. It is metadata about the image, not a caption or a general description of the page.
The protocol recommends providing the description whenever you provide an Open Graph image. That makes the image’s meaning available as metadata, but it does not establish how every social platform or link-preview client currently displays or exposes the value.
Where to put it
Add both properties as <meta> elements in the document’s <head>. Keep the description next to the exact image URL it describes:
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<meta property="og:image" content="https://example.com/share-image.jpg">
<meta property="og:image:alt" content="A hiker crossing a snow-covered ridge at sunrise">The URL and description here are illustrative. If the page has multiple og:image values, associate each description with its corresponding image rather than using one description that could refer to the wrong image. The Open Graph Protocol shows this image-and-description pattern in its structured-property example.
How to write a useful description
Describe the meaningful content of the specific image in plain, specific language. State the subject and, where it matters, what is happening or how elements relate. Include words or data embedded in the image when a reader needs them to understand it.
- Photograph:
A brown dog catching a red ball in a grassy park - Image with important text:
Event poster reading “Open house, Saturday at 10 a.m.” - Chart:
Line chart showing monthly signups rising from 200 to 850—only if those values are actually visible in the chart.
Avoid a generic label such as “image,” a keyword list, a page summary, or wording that reads like a promotional caption. There is no fixed word count or character length required by the Open Graph Protocol; include the details needed to identify the image’s meaningful content without adding irrelevant ones.
Is og:image:alt the same as an image’s alt text?
They are related in purpose, but they are not the same field. og:image:alt is Open Graph metadata in the page head, describing the image associated with og:image. An HTML image’s alt attribute is part of the image element and is written for that image’s context on the page.
W3C WAI’s guidance on image alternatives can help decide what information matters: informative images should convey essential information; functional images should communicate their function; images containing important text should include that text; and complex charts or diagrams may need a fuller equivalent. WAI recommends a null alternative for decorative images in the HTML image context. That guidance informs good description-writing, but it does not replace the Open Graph Protocol’s recommendation to supply og:image:alt when og:image is present.
For further context, see the W3C WAI Images Tutorial and its guidance on using alt attributes on img elements.
Check your metadata
- Confirm that
og:imagepoints to the intended sharing image. - Write
og:image:altto describe that exact image, not the page generally. - If you specify multiple images, check that each description is associated with the right image.
- Use details that communicate the image’s essential subject, action, text, or data.
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