You can tell Google which image best represents a page, but you cannot force Google Discover to show it. Use a relevant, high-quality image; expose it consistently through og:image and/or schema.org markup; permit large previews; and make sure Google can find and access the image.
Choose an image that represents the page
Use a large, relevant image that reflects the page’s main subject. Google recommends avoiding generic logos and text-heavy artwork. For Discover, its guidance recommends an image at least 1200 pixels wide and more than 300,000 pixels in total, composed for a landscape 16:9 presentation. For example, 1280 × 720 is 921,600 pixels. Google may crop images automatically, so keep the important subject visible in a landscape crop. These are recommendations, not a guarantee that an image will appear in Discover. Google’s Discover guidance
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Tell Google which image you prefer
Google documents both the Open Graph og:image tag and schema.org image markup as sources for thumbnails in Search and Discover. You can use either, or both. If you supply both, point them to the same page-specific image so the signals agree. Google does not document one format as universally superior; choose the one your site can maintain accurately. Its March 2, 2026 documentation update clarified that both are sources. Google image SEO best practices · Google Search documentation updates
Do these 3 things before closing this tab:
1Fix the driver behind crashes, sound loss and screen glitches2Clear out junk files and repair common Windows errors3Scan for outdated or missing drivers - takes under a minuteOpen Graph example
<head>
<meta property="og:image" content="https://example.com/images/article-hero-1280x720.jpg">
</head>Schema.org example
<script type="application/ld+json">
{
"@context": "https://schema.org",
"@type": "WebPage",
"url": "https://example.com/article",
"primaryImageOfPage": "https://example.com/images/article-hero-1280x720.jpg"
}
</script>Replace the example URLs with the canonical page URL and the actual image URL. These declarations express a preference; they do not override Google’s automated image selection.
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Allow a large image preview
On pages where you want a large preview, add a robots directive that permits it:
<meta name="robots" content="max-image-preview:large">Google describes large as allowing a larger image preview up to viewport width. The other values are standard, which permits a default preview, and none, which disallows image previews. This setting controls preview size; it does not tell Google which image to choose. AMP is another route named in Google’s Discover image recommendations. Check for page-level directives that may restrict previews. Google robots meta tag specification
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Make the image discoverable and accessible
- Use a standard HTML
<img src="...">for the image where possible. Google says it can find images in an image element’ssrcattribute, but does not index CSS background images. - If you use responsive image markup, include an
<img src>fallback. - Ensure Googlebot can access both the page and the image URL; metadata cannot compensate for an image Google cannot fetch.
- Consider an image sitemap to expose image URLs that might otherwise be undiscovered.
Verify the rendered page, not just the CMS setting
- Open the page’s rendered HTML and check its page-specific
og:imagevalue. - Inspect the structured data, if present, and confirm its image URL matches the intended image.
- Check the robots directives for the page and confirm that preview restrictions do not contradict the desired large preview.
- Open the image URL and verify that the image is available to crawlers and has the expected dimensions and crop.
- Confirm that the image is represented in crawlable HTML rather than only as a CSS background.
These checks validate the implementation signals, not Google’s eventual thumbnail choice. Google says image-preview selection is automated. Google image SEO best practices
If Discover still shows a different image
Google may select an image from multiple sources, and its documentation does not offer a setting to force a thumbnail. Check the likely failure points in this order:
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- Conflicting signals: Make
og:imageand schema.org markup agree, if both are present. - Weak image choice: Replace generic or text-heavy artwork with a representative, high-resolution image and review the landscape crop.
- Preview restriction: Check that
max-image-preview:largeis present where desired and not contradicted by a page-level robots directive. - Image not found or blocked: Provide a crawlable image URL, use an HTML
<img src>, and confirm Googlebot can access it. - Rendered page differs from the editor: Inspect the live page output, since templates or page-specific settings may produce different metadata than the CMS field suggests.
Even when these signals are correct, the chosen preview remains Google’s decision.
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What the published case studies do—and don’t—show
Google’s August 11, 2021 case-study article reported that Kirbie’s Cravings saw a 79% CTR increase after adding max-image-preview:large. It also reported a 30% CTR increase and a 332% click increase over six months for Istoé after adopting large image preview settings. These are publisher-reported historical outcomes, not controlled evidence that the tag alone caused the gains or a forecast of current results. Google’s case study
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