Open Graph image URLs (what crawlers actually need)

Crawlers fetch a URL

Slack, X, and iMessage do not open your laptop. They GET an HTTPS image. If that URL 404s, the card is blank.

A PNG on disk does not count

Exporting a 1200×630 file and leaving it in Downloads does nothing. The crawler needs a public address that returns image/png.

What to put in the meta tag

<meta property="og:image" content="https://cardurl.dev/og/<siteKey>/blog?title=Ship+it&author=you" />

Hosted until you cancel

CardURL hosts that URL for $39/mo. Cancel and it 404s. Preview on the home page needs no signup.

URL shape

See how hosted URLs work and templates.