What Open Graph tags do
When someone pastes your link into LinkedIn, Facebook, Slack, iMessage, Discord or X, the app fetches the page and builds a preview card from its Open Graph tags. Good tags produce a large image, a clear title and a one-line description. Missing tags produce a bare URL, or a card with whatever image the platform guesses.
On launch day, that card is your ad. It is worth checking before you post.
The tags that matter
- og:title. The card's headline. Can differ from the page title; it does not need the brand suffix.
- og:description. One or two sentences. Many platforms cut it after about 150 characters.
- og:image. An absolute https URL. 1200 × 630 pixels (1.91:1) works everywhere. Keep it under 5 MB and avoid text near the edges, which some apps crop.
- og:url. The canonical URL that shares are counted against.
- og:type.
websitefor most pages,articlefor posts. - og:site_name. Your brand, shown above the title on several platforms.
- twitter:card.
summary_large_imagefor the big image layout on X. X falls back to the og: tags for title, description and image.
Why my card did not update
Platforms cache previews, sometimes for days. After fixing tags, use Facebook's Sharing Debugger or LinkedIn's Post Inspector to force a refetch. Also check that the image URL is public, served over https, and not blocked by robots.txt or hotlink protection. The checker requests the image and reports its status and type.
Preview accuracy
The previews here follow each platform's current layout closely, but every app renders slightly differently and changes its design over time. Treat them as a strong guide. To create tags from scratch, use the Open Graph generator, and for the image itself, the OG image generator.