Guides
In-depth guides
Longer walkthroughs for specific setups: real screenshots, code you can paste and the reason behind every step. The short fix page for each check lives under Learn.
All guides
10 guides.
- 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 4 Oct 2026 - Social11 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 4 Oct 2026 - Social13 min read
Clear Facebook cache for a link: fix an old or missing preview
To clear the Facebook cache for a link, purge your own page cache, open the Sharing Debugger, paste the URL and click Scrape Again. How to refresh LinkedIn, X, Slack and WhatsApp, and fix a preview that is missing.Updated 27 Sept 2026 - Social20 min read
Open Graph tags: how link previews work and how to get them right
Open Graph tags are the og meta tags in your page's head that Facebook, LinkedIn, WhatsApp, Slack and X read to build a link preview. This guide covers every tag, the image that works everywhere, and how to fix a preview that is wrong.Updated 26 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 - Social10 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 - 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
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
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