See how your link looks when it is shared

The tags a good card needs

<meta property="og:title" content="A title under 60 characters">
<meta property="og:description" content="One or two sentences. About 150 characters.">
<meta property="og:image" content="https://example.com/card.png">
<meta property="og:image:width" content="1200">
<meta property="og:image:height" content="630">
<meta property="og:image:alt" content="What the picture shows">
<meta property="og:url" content="https://example.com/page">
<meta property="og:site_name" content="Example">
<meta name="twitter:card" content="summary_large_image">

Why a card is missing or stale

• The tags are added by script. Crawlers read the HTML your server sends and do not run JavaScript. Tags a single-page app writes after loading are invisible to them.
• The picture is too slow or too big. Crawlers give up after a few seconds. Keep it well under a megabyte and serve it over https.
• The crawler is blocked. Bot protection and sign-in walls answer crawlers with a challenge page. If the table above shows an error for one app only, that is the cause.
• The app cached the old card. Each app keeps its own copy. Facebook and LinkedIn have tools to fetch again; iMessage and WhatsApp do not, and a link with a new query string is treated as a new page.