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A social image is a visual made or selected for use on social media. It can be the image in a post, an account’s profile or cover image, or the preview picture that appears when someone shares a webpage link. For link previews, a page’s Open Graph metadata—especially og:image—helps tell platforms which image to display.
There is no single social-image file type or universal size. The right choice depends on where the image will appear, what it needs to communicate, whether it remains legible when cropped or viewed on a phone, and whether you have permission to use it.
What counts as a social image?
“Social image” describes an image’s purpose, not a particular format. A JPEG photograph, PNG illustration, WebP graphic, chart or branded design can all serve as a social image. The important distinction is how it will be used: as a post’s creative, as an account identity image, or as the preview for a shared webpage.
- Post creative: A photo, illustration, chart or designed graphic carries or supports the main message in a feed. The accompanying post text can add context or detail.
- Link-preview image: When a page URL is shared, a platform may use metadata on that page to choose a thumbnail or larger preview image. The Open Graph property
og:imageidentifies a candidate image. - Profile and page identity: Avatars, covers and headers help people recognize an account, publication or organization. Their display shape and crop can differ from the original file.
- Campaign and announcement graphic: A visual can identify a launch, event, warning or call to action, while the post copy supplies information that should not be left to the image alone.
The Open Graph protocol describes its purpose as enabling a web page to become a rich object in a social graph. In practical terms, it gives sharing platforms structured hints about a page, including which image can represent it.
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How link-preview images work
When a page is shared, a social platform can fetch the page and inspect its metadata. A minimal Open Graph image declaration looks like this:
<meta property="og:image" content="https://example.com/image.jpg">The URL should point to the intended image, not to the webpage itself. An accessible description can be provided separately:
<meta property="og:image:alt" content="A concise description of the image">Open Graph also supports image-related properties such as og:image:width, og:image:height, og:image:type and og:image:secure_url. These describe aspects of the image or supply an HTTPS image URL. Add metadata that accurately describes the asset; do not assume that declaring dimensions or a type can compensate for a broken or unsuitable image URL.
Platforms may render previews differently, and their behavior can change. The metadata identifies an intended image, but it does not guarantee that every service will show it in precisely the same way. A platform may crop the image, use cached data, or apply its own display rules.
How to choose an image that works
There is no universal best social-image dimension. A feed post, profile avatar, page cover and link preview have different shapes and display constraints; platforms can also change their requirements. Choose dimensions for the specific placement and check the current guidance for the platform where you plan to publish.
Start with purpose and crop
Decide what the image needs to do before exporting it. A link preview should represent the page people will reach. A post graphic may need to make a particular point quickly. An avatar should remain recognizable at small sizes. Keep a subject or key logo away from edges where a crop could remove it, and inspect the image in the shape and scale in which it will actually appear.
Make it understandable on a phone
Small screens and compact previews reduce detail. Use a clear focal point and avoid making important text so small that it becomes unreadable. If the design contains essential wording, repeat that wording in the post text or provide it as an appropriate text alternative. Readers should not have to decipher a graphic to obtain information that matters.
Use a relevant, representative image
For a webpage preview, select an image that reflects the page’s actual subject. Google recommends choosing an image that is relevant and representative, avoiding generic logos and extreme aspect ratios, and using high resolution where possible. A brand logo alone may identify the publisher, but it can be a poor substitute for an image that tells readers what the particular page is about.
Balance quality and delivery
Use enough resolution for the intended display, but optimize the image for web delivery so it is not unnecessarily large. The appropriate format depends on the asset and the destinations that need to display it. Check that the exported file remains visually clear and that its public URL is accessible to the platform fetching the page.
Accessibility: alt text, captions and contrast
Alt text is a text alternative that communicates the meaning or relevant content of an image to people who may not be able to see it, including people using screen readers. It is not the same thing as a visible caption. A caption is displayed alongside an image; alt text is an alternative representation used in contexts where the image itself may not be perceived.
Write alt text for the image’s context and purpose. W3C guidance emphasizes that the appropriate text alternative depends on an image’s usage, context and content. Describe what matters rather than mechanically listing every visible detail. If an adjacent caption already communicates the same information, repeating it word for word in alt text may add little. Section508.gov likewise describes alt text as text that conveys an image’s meaning.
- Describe the information the image contributes in this post or page.
- Do not rely on color alone to communicate a distinction; use labels, shapes or other cues as well.
- Keep text and important visual elements readable against their backgrounds.
- Repeat essential wording from an image in the post copy or a suitable text alternative.
For Open Graph previews, og:image:alt supplies an image description in metadata. That description should be concise and useful, not a keyword list or a duplicate of unrelated page text. Google Search Central identifies alt text as especially important when providing more metadata for an image.
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Finding an image online does not mean it is free to reuse. Photographs and other images are generally protected by copyright; copying, publishing or hosting a third-party image can require permission or a license. The EU Publications Office advises using images only after prior authorization from the copyright owner. The precise rules and license terms can depend on the image, intended use and applicable law.
Before publishing an image you did not create, identify the creator or licensor and check the terms for social-media use, commercial use, geographic limits and duration. Save evidence of permission or the license that applies. Preserve creator, credit-line, copyright-notice and license information where available; Google recommends retaining such information in structured data or IPTC metadata where possible. Depending on the image and local law, model, property or trademark releases may also be relevant.
- Identify who owns or licenses the image.
- Read the terms for the exact way you intend to publish and promote it.
- Keep a record of permission and any conditions, including required credit.
- Preserve available rights metadata and obtain any releases that are needed for your use.
Why the wrong image appears on a shared link
If a preview shows an old, generic or unrelated image, check the page itself before assuming the platform is ignoring your update. A previously fetched preview may be cached, so changing the page metadata does not necessarily change every already-stored preview immediately.
- Inspect the page source. Find the Open Graph
og:imageproperty and verify that its content value is the image URL you intend to use. Checkog:image:altas well if you provide a description. - Check the image URL. Confirm that it is publicly reachable and points directly to the intended image. A private, inaccessible or incorrect URL cannot serve as a useful preview image.
- Check what the page returns. Make sure the metadata is present in the page source that a platform can fetch, rather than only appearing after a client-side change that the fetcher may not see.
- Refresh the platform’s preview data. Use that platform’s current link debugger or sharing tool, where available, to prompt a fresh fetch. The exact tool and behavior are platform-specific and can change.
- Check the displayed crop. If the correct image is present but looks wrong, it may be the platform’s crop or rendering rather than an incorrect metadata URL.
To inspect the page as a reader would see it, a screenshot can be useful alongside inspecting the source: it shows whether the page rendered as expected, though it does not replace checking metadata or refreshing a platform’s cached preview.
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For a rendered page check, ScreenshotNeo can return a screenshot with one GET request. The same service can capture images or PDFs, but a screenshot alone does not tell you which Open Graph value a platform selected.
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://example.com -o shot.webpSee the ScreenshotNeo documentation for API details. ScreenshotNeo removes cookie/consent banners, newsletter popups and chat widgets before capture; bot checks, blank pages and failed loads are not billed. Its MCP server lets AI agents use screenshot tools. The Free plan includes 1,000 screenshots per month with no card; paid plans start at $5 for 3,000. Sign up for the free plan.
Quick checks before publishing
- Does the image suit its purpose: post, profile identity or page preview?
- Does the crop preserve the subject and any important branding?
- Is the message legible at mobile size, with adequate contrast?
- Does the page declare the intended image in
og:image? - Is the image URL publicly reachable and the asset optimized for web delivery?
- Have you supplied useful alt text and kept essential information available as text?
- Do you have documented rights to use the image, with any required credits or metadata retained?
Frequently Asked Questions
Is a social image the same as a thumbnail?
A thumbnail is one possible small display of an image. “Social image” is broader: it can mean a post graphic, an account identity image, or a link-preview image.
Does adding og:image guarantee that every platform will show that picture?
No. Open Graph metadata provides a candidate image, but preview fetching, caching, cropping and rendering vary by platform.
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Can I use a photo just because I found it in a search engine?
No. Search visibility does not establish permission. Check the rights and license for your intended use or obtain authorization.
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