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A social card image is the visual preview attached to a shared URL. Prepare a page-specific image, publish it at a public absolute URL, and connect it to the page with Open Graph metadata. A dependable starting canvas is 1200×630 pixels, but destination-platform requirements take priority: LinkedIn’s organic link-sharing guidance specifies at least 1200×627 pixels, a 1.91:1 ratio, and a 5 MB maximum.

What a social card image is

When someone shares a web page, a platform may assemble a compact card containing the page title, description, image and domain. The image should represent that particular page rather than your entire site or brand in general. The metadata connects the image to the URL and tells crawlers what to display.

The Open Graph protocol describes how a web page becomes a rich object in a social graph. Its four basic properties are:

  • og:title — the title shown for the shared page.
  • og:type — usually website for a normal page, or another supported type when appropriate.
  • og:image — an absolute URL to the preview image.
  • og:url — the canonical URL represented by the card.

Image-specific properties can add the MIME type, width, height and alternative text. Use og:image:alt to describe what is visibly in the image, not to write a caption or repeat marketing copy.

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Choose the image size and format

Use a practical starting canvas

A 1200×630-pixel canvas (approximately 1.91:1) is a useful cross-platform starting point. SocialCard’s February 27, 2026 vendor guidance recommends that size, JPEG for photographs and PNG when transparency is required. Treat that as practical advice, not a universal rule: individual platforms can impose different limits, and transparent areas may render differently from one service to another.

Meet LinkedIn’s stated organic-sharing limits

LinkedIn’s website-sharing help page specifies a minimum of 1200×627 pixels, a recommended 1.91:1 ratio and a maximum file size of 5 MB for organic link previews. Images narrower than 401 pixels are displayed as thumbnails. An image can meet those dimensions and still be absent if LinkedIn cannot fetch it or the file is protected. See LinkedIn’s sharing guidance for the current requirements.

Do not assume undocumented X limits

The X developer-documentation destination examined for this topic redirected to general documentation, so exact current X dimensions, file limits and metadata requirements are not verified here. Check X’s own documentation before creating a platform-specific variant.

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Design for cropping

  • Keep logos, faces and essential words near the center safe area.
  • Use strong contrast and a short page-specific headline; the card may be reduced dramatically on mobile.
  • Do not put critical information at the extreme top, bottom or sides, where a platform crop can remove it.
  • Export a web-sized file below the destination’s limit. For LinkedIn, remain under 5 MB.

Make separate variants only when a target platform’s documented dimensions or crop behavior materially harms the composition. In every case compare the platform’s accepted dimensions, crop, readability, page relevance and crawler access.

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Add Open Graph metadata correctly

Minimal HTML

Place these tags in the delivered page’s <head>. Replace the example values with the individual page’s data.

<meta property="og:title" content="How to Audit a Website’s Accessibility">
<meta property="og:type" content="website">
<meta property="og:image" content="https://example.com/images/accessibility-card.jpg">
<meta property="og:url" content="https://example.com/accessibility-audit">
<meta property="og:image:type" content="image/jpeg">
<meta property="og:image:width" content="1200">
<meta property="og:image:height" content="630">
<meta property="og:image:alt" content="Checklist and laptop illustrating a website accessibility audit">

Use an absolute HTTPS image URL that returns the image itself, not an HTML page or a redirect chain that blocks crawlers. Keep og:url canonical and consistent with the URL you want indexed and shared. If your framework generates tags server-side, verify the final response rather than relying on what a browser adds after JavaScript runs.

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One image versus variants

A single 1200×630 image reduces maintenance and works as a sensible default. Platform-specific files can improve results when official requirements differ, but each variant needs its own public URL and testing. Regardless of the choice, the artwork must be representative of the page being shared; a generic home-page graphic weakens the preview’s context.

How to check a social card before publishing

  1. Inspect delivered HTML. View the raw response (for example, with “View Source” or curl) and confirm the intended og:title, og:type, og:image and og:url. Confirm og:image:alt describes the visible image.
  2. Fetch the image as a crawler would. Open the exact image URL in an unauthenticated browser window and request it with a normal HTTP client. Check for a successful status, correct Content-Type, no login requirement and no IP or user-agent block.
  3. Check dimensions and bytes. Measure the actual file, not the design document. For LinkedIn, verify at least 1200×627 and no more than 5 MB.
  4. Render a preview. SocialCard provides multi-platform and platform-specific preview tools, and OpenGraph.dev offers Open Graph preview and meta-tag generation. These can reveal malformed tags or obvious crops, but a preview tool cannot guarantee that a platform will fetch every URL.
  5. Test after deployment. Social crawlers cache previews. Change the image URL (for example, by using a new filename) when you need to distinguish a new asset from a cached response, then recheck the destination platform.

Why the image is missing or cropped

The crawler cannot reach the file

Robots rules, a firewall, authentication, signed URLs that have expired, hotlink protection or a private storage bucket can all prevent retrieval. LinkedIn explicitly lists blocked access and protected image locations as reasons an otherwise valid image may not appear. Make the image publicly fetchable by the relevant crawler while keeping the page itself as private as your security model requires.

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The tags are absent from the response

Some single-page applications insert metadata only after JavaScript executes. If a crawler receives an empty shell, it may never see the tags. Render the metadata in the server response or static HTML and inspect that response directly.

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The URL or file is invalid

Common failures include a relative og:image URL, a typo, a 404 response, an HTML error document saved with an image extension, an unsupported MIME type or a file over the platform limit. Copy the exact URL from the delivered tag and test it independently.

A cache still contains the old card

Updating the file in place does not force every network to refetch it. Publish a versioned filename or query-free replacement URL, then use the platform’s current link-inspection or debugging workflow to request a fresh fetch.

The composition is being cropped

Even a correctly sized image can be cropped in feeds, notifications or mobile layouts. Preview the rendered card at several widths and move essential text inward. Never assume the full 1.91:1 artwork will be visible everywhere.

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Automate screenshots of social cards and pages

If you need a rendered image of the page itself for QA, documentation or a social-card workflow, ScreenshotNeo is the first service to try: it removes consent banners, newsletter popups and chat widgets before capture, bills only clean shots, and has the lowest paid plan listed here.

One-request capture

With an API key, the following requests save a WebP screenshot of a URL. The complete option list and response headers are in the ScreenshotNeo documentation.

curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webp
import requests
r = requests.get("https://api.screenshotneo.com/v1/shot", params={"access_key": "YOUR_API_KEY", "url": "https://stripe.com"}, timeout=90)
r.raise_for_status()
open("shot.webp", "wb").write(r.content)
const q = new URLSearchParams({ access_key: 'YOUR_API_KEY', url: 'https://stripe.com' });
const res = await fetch(`https://api.screenshotneo.com/v1/shot?${q}`);
if (!res.ok) throw new Error(`HTTP ${res.status}`);
const fs = await import('node:fs/promises');
await fs.writeFile('shot.webp', Buffer.from(await res.arrayBuffer()));

Useful capture controls

  • Full-page capture loads lazy images; you can capture one element with a CSS selector.
  • Select dark mode, one of 12 device presets or any viewport, and choose retina scale.
  • Produce PDFs with paper size, margins, landscape mode and page ranges.
  • Render supplied HTML/CSS, run custom JavaScript, click an element, hide selectors, or wait for a selector, delay or network idle.
  • Block ads, trackers, requests or resource types; set headers, cookies, user agent, Authorization, timezone and geolocation.
  • Use transparent backgrounds, resize images, cache with a chosen TTL, create signed links for public <img> tags, submit asynchronous jobs with signed webhooks, capture up to 100 URLs per bulk call, and read usage through the usage API and OpenAPI specification.
  • Parameter names used by other screenshot APIs also work, easing migration.

Billing and failure handling

Only clean shots are billed. Bot checks or CAPTCHAs, blank pages, timeouts, failed loads and cache hits cost nothing, and each response identifies the result with X-Page-Verdict and X-Billed headers. Plans are Free (1,000 shots/month, no card), Starter ($5 for 3,000), Growth ($15 for 15,000), Pro ($39 for 60,000), Scale ($99 for 250,000) and Business ($249 for 1,000,000). Yearly billing gives two months free; every feature is included on every plan.

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That single API call removes cookie banners, popups and chat widgets before the shot. Bot checks, blank pages and failed loads are never billed. An MCP server supplies take_screenshot, get_page_info and capture_pdf tools to Claude, Cursor and other MCP clients. You get 1,000 screenshots a month free with no card, and paid plans start at $5 for 3,000. Create a free ScreenshotNeo account.

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What the evidence says about image selection

The 2021 study “Automatically Selecting Striking Images for Social Cards” reported that over 40% of sampled NEWSROOM news articles and 22% of sampled PubMed Central scholarly articles lacked striking images. Its tested method reported Precision@1 of 0.83 on NEWSROOM and 0.78 on PLOS ONE. Those figures describe the authors’ datasets and methods, not current prevalence across the web or a guarantee for a production system. They do, however, support treating image selection as a deliberate editorial task rather than an automatic afterthought.

Pre-publish checklist

  • The image depicts the specific page’s subject.
  • The final file meets the destination’s current dimensions and byte limits.
  • og:title, og:type, og:image and og:url are present in raw delivered HTML.
  • og:image:alt describes the visual content.
  • The image URL is absolute, HTTPS, publicly fetchable and returns the correct MIME type.
  • Text survives likely crops and remains legible on a small screen.
  • A rendered preview has been checked after deployment.

Frequently Asked Questions

Should the social card image contain the page title?

It can, but it does not have to. Keep any text short, high-contrast and inside a safe area; the HTML title remains the authoritative page label.

Can I use a protected or signed image URL?

Only if the destination crawler can retrieve it for as long as the preview may be cached. A protected or expired URL commonly causes the image to disappear.

Is 1200×630 an official requirement everywhere?

No. It is a practical cross-platform recommendation. Use each platform’s current official limits; LinkedIn’s organic guidance, for example, states 1200×627 minimum and 5 MB maximum.

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