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Social & sharing

How to set up a Twitter card

X falls back to your Open Graph tags but defaults to the small square layout. Declaring summary_large_image is one line and roughly doubles the visual footprint of every post linking to you. With neither a card nor an og:image, links render as plain text.

What 13x checks

This is rule social.twitter-card in the public registry: Twitter card type is declared. It runs on every audit, against the pages we actually fetched, and its result is derived from the response rather than estimated.

Surface
Social & sharing
Score weight
4 of the readiness score
Scope
Reported as skipped when the page renders only with JavaScript
Applies
To every site

Registry version 2026-07-30. Every rule is published, and the audit is deterministic — the same page produces the same finding every time.

The fix

The same text the audit hands you when this check fails on your own site.

html code
<meta name="twitter:card" content="summary_large_image" />

X falls back to your Open Graph tags for the title, description and image, so this one line is usually all that is missing. It changes the layout from a small square thumbnail to a full-width image.

Framework-specific versions

Where the change differs enough to be worth writing out separately.

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