Open Graph image size, and why your link preview is blank

Use an image around 1200 by 630 pixels, served from an absolute https URL and named in an og:image tag, and your link preview will stop showing up blank.

You share your launch post and the card shows a grey box, or no image at all. A blank preview costs clicks every time anyone shares your link, and it is usually a two-minute fix.

The tags you need

<meta property="og:title" content="Your page title">
<meta property="og:description" content="One sentence about the page.">
<meta property="og:image" content="https://example.com/share.png">
<meta property="og:url" content="https://example.com/">
<meta name="twitter:card" content="summary_large_image">

Image checklist

• Size: around 1200 by 630 pixels, a 1.91 to 1 ratio, is a common choice for large link cards.
• URL: use a full https address. A relative path such as /share.png often fails.
• Access: the image must load without a login or a block on bots.
• Text: keep words large and near the middle, because apps crop the edges differently.

Why the preview is still blank or old

• Tags are missing. View the page source and search for og:image.
• The image URL is broken. Open it in a new tab. If it does not load, neither will the card.
• The app cached an old version. Apps store the preview the first time they see a link. Use the platform's own refresh tool, such as the Facebook Sharing Debugger or the LinkedIn Post Inspector, to fetch it again.
• The page renders tags with JavaScript. Many preview bots do not run scripts, so put the tags in the server-rendered HTML.

Twitter card tag

X can fall back to Open Graph, but twitter:card makes the large-image card explicit. In our audits of 365 homepages, 90 of the 251 sites with two or more issues (36%) had no twitter:card tag, and 67 (27%) had no Open Graph tags at all. That is our own sample, not a base rate for the web.

Open Graph does not affect your Google ranking. It controls how your link looks when someone shares it. See the full list in the Open Graph tags checker.

Check your own site

Marlo's free audit crawls your homepage and checks the title, description, headings, canonical and social tags, with the fix for each. No signup.

Written by Marlo's maker. Marlo is open source (AGPL-3.0) and the audit code is public.