Social previews
How a link looks when it is shared on Facebook, LinkedIn, X and Slack.
Guides
- Social10 min read
Debugging a cached link preview: why the old image keeps showing
You changed the share image and Facebook, LinkedIn or WhatsApp still shows the old one. Where each platform caches previews, how to refresh each, and the image problems that look like caching.Updated 25 Sept 2026 - Social10 min read
Facebook App ID (fb:app_id): do you need it and what it changes
Most sites do not need fb:app_id: previews render without it and the Sharing Debugger warning is harmless. When the tag does matter, how to get an ID and where WordPress plugins put it.Updated 25 Sept 2026 - Social11 min read
Generating Open Graph images automatically for every page
Stop making share images by hand. Build one 1200×630 template, render it from the page title at build time or on request, cache it, and check the result with a free link preview tool.Updated 25 Sept 2026 - Social9 min read
Link previews for PDF and file links: why they are blank and the fix
A link straight to a PDF, DOCX or ZIP shares as a bare URL because files carry no Open Graph tags. Give each document a landing page with a cover image, and keep the file where it is.Updated 25 Sept 2026 - Social7 min read
Link previews: Open Graph and Twitter cards that look right
When someone pastes your link into WhatsApp, Slack, LinkedIn or X, the preview is built from four meta tags. This guide covers the tags, the image size that renders sharply on every network, how each platform caches previews, and how to debug a preview that shows the wrong image.Updated 25 Sept 2026 - Social10 min read
og:url and the canonical tag: keeping them in sync
og:url is the address Facebook, LinkedIn and WhatsApp file a share under. When it differs from the canonical, shares split and cards link to the wrong page. What the report compares and how to fix it.Updated 25 Sept 2026 - Social10 min read
Open Graph images: the right size, safe area and weight
One 1200×630 px image with text inside the safe area and a file under 1 MB looks sharp on Facebook, LinkedIn, X, Slack and WhatsApp. How to make it, tag it and refresh old previews.Updated 25 Sept 2026 - Social10 min read
Open Graph title, description and type: the fields previews use
What og:title, og:description and og:type do on Facebook, LinkedIn, X, Slack and WhatsApp, the fallbacks when they are missing, how to write them differently from your SEO title, and a complete head.Updated 25 Sept 2026 - Social10 min read
Twitter/X cards: summary vs summary_large_image and what X reads
Which X card type to use, the exact fallback rules from twitter tags to Open Graph, image sizes and limits, what changed since the Card Validator went away, and how to check a card before you post.Updated 25 Sept 2026 - Social12 min read
WhatsApp, Slack, LinkedIn, iMessage: what each link preview reads
Every chat app builds its preview from the same Open Graph tags, then applies its own limits and cache. A per-platform table of what each reads, the image rules, the bots to allow, and how to test.Updated 25 Sept 2026
Check all 11 at once
The Link preview runs every check on this page against your site.