LINK PREVIEW PREFLIGHT
ShareScan | 9 October 2026

Use this before sharing a campaign, publishing a product collection or handing
over a client website. Record what you checked; a sample is not a full-site audit.

Release/date:
Owner:
Pages checked (choose up to 10 representative public URLs):

[ ] Use the final public URLs, not CMS previews or protected staging URLs.
[ ] Check the HTML returned by the server, not only the browser's live DOM.
[ ] Confirm og:title, og:type, og:url and og:image for each page.
[ ] Use property and content attributes for Open Graph tags, for example:
    <meta property="og:image" content="https://example.com/images/share-v2.jpg">
[ ] Check for competing values from a theme, SEO plugin or page template.
[ ] Fetch the exact image URL without cookies or login. Check the final status,
    Content-Type and actual image. A 200 HTML response is not a working image.
[ ] Keep the image URL stable and public. Avoid expiring signed links.
[ ] If the source is correct but the card is old, use the platform's own tool.
    LinkedIn: https://www.linkedin.com/post-inspector/
    Facebook: https://developers.facebook.com/tools/debug/
[ ] In Slack, check preview preferences and test one full URL in a message.
    Repeating a link in the same conversation within an hour may hide the card.
[ ] Test a new share after the fix. Existing posts may keep their old preview.
[ ] Record any remaining failure, its owner, and the next check date.

OPTIONAL COMMANDS FOR DEVELOPERS
Replace these example URLs with pages and images you control.
These are GET requests. Header-only requests can behave differently.

curl --location --max-time 20 --dump-header page-headers.txt \
  --output page.html 'https://example.com/product'

curl --location --max-time 20 --dump-header image-headers.txt \
  --output share-image 'https://example.com/images/share-v2.jpg'

A request from your machine does not prove that a platform's crawler can fetch
the same resource. Use its debugger and your server/CDN logs when they differ.

FREE CHECK AND OPTIONAL FOLLOW-UP
https://sharescan.io/open-graph-checker
Paste up to 10 public URLs, one per line. Domain and sitemap inputs select a
limited sample. After reviewing the report, you can explicitly opt into email
or Slack monitoring for up to 10 report pages. The first follow-up is scheduled
24 hours after activation, then weekly. Scanning alone does not activate monitoring.

ShareScan checks source metadata and image access. Platform rendering and
cache refresh remain controlled by the platform.

REFERENCES
Open Graph: https://ogp.me/
LinkedIn: https://www.linkedin.com/help/linkedin/answer/a6233775
Slack: https://slack.com/help/articles/204399343-Share-links-and-set-preview-preferences