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Conversion

What size should an og:image be

Facebook, LinkedIn and Slack drop to the small square layout below roughly 600×315, so the image appears as a thumbnail beside the text instead of above it. Platforms crop toward 1.91:1 from the centre, so anything much taller or wider loses its edges — usually where the product name sits. 1200×630 is the safe size.

What 13x checks

This is rule conversion.og-image-size in the public registry: og:image is the right size. It runs on every audit, against the pages we actually fetched, and its result is derived from the response rather than estimated.

Surface
Conversion
Score weight
5 of the readiness score
Scope
Reported as skipped when the page renders only with JavaScript
Applies
Only where the market or the page shape makes it relevant

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.

The og:image is ×. Use 1200×630 (1.91:1).

That size works everywhere: Facebook, LinkedIn and Slack render it as a full-width card, and X uses it for summary_large_image. Below roughly 600×315 they all fall back to a small square thumbnail beside the text.

Design constraints that matter more than the pixel count:

- Platforms crop toward the centre, so keep text away from the edges — that is usually where the product name sits. - It is read at thumbnail size in a feed. Nothing smaller than about 40px tall is legible. - Keep it under 5 MB, or some crawlers give up and render no image.

Declare the dimensions too, so the card renders before the image downloads:

html code
<meta property="og:image" content="https://example.com/og.png" />
<meta property="og:image:width" content="1200" />
<meta property="og:image:height" content="630" />

Framework-specific versions

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

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