HeadlarkUpdated 2026-10-20
Open Graph tags for every page
When someone shares your link in Slack, LinkedIn, Facebook, iMessage or X, the preview card is built from Open Graph tags (og:title, og:description, og:image, og:url) and X's twitter:* tags. Without them, the card is a bare URL or whatever text the previewer guesses.
Why your tags may be invisible
Link previewers fetch the raw HTML and don't run JavaScript. Tags that a script adds after the page loads, including those from many client-side SEO tools and from single-page apps that set the head at runtime, never reach them. The tags have to be in the HTML the server sends.
Check what previewers see
curl -s https://example.com/pricing | grep -E 'og:|twitter:'If that prints nothing but your browser's inspector shows the tags, they're added by JavaScript. LinkedIn's Post Inspector and Facebook's Sharing Debugger show the card each network builds. The free SEO checker reads the same raw HTML and previews the Google, LinkedIn, Slack and X cards in one go.
What Headlark writes
| Tag | Value |
|---|---|
| og:title, og:description | Written per page, a little more conversational than the search title and description. |
| og:url | The page's canonical address. |
| og:type | website, article, product or profile, from the content. |
| og:image, twitter:image | Your page's existing og:image if it has one, otherwise its most representative image, otherwise the default share image you set for the site. Headlark doesn't create images. |
| og:site_name, og:locale | When the page makes them clear. |
| twitter:card, title, description | summary_large_image when there's an image, otherwise summary. |
Which route puts them in the HTML
- Build step (Vite, Astro, Next.js, Netlify): all of the tags above, written into the files. Every previewer sees them.
- Webflow: the Open Graph title and description go into Webflow's page settings, which Webflow serves in the HTML. The Open Graph image stays whatever you set in Webflow.
- Snippet: added by JavaScript, so link previewers don't see them. Use it for Google only.
Try it
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