"Google's selection of an image preview is completely automated and takes into account a number of different sources to select which image on a given page is shown on Google (for example, a text result image or the preview image in Discover). You can influence which image gets selected by providing your preferred image through one of the following metadata sources: Specify the schema.org primaryImageOfPage property with a URL or ImageObject, or specify an image URL or ImageObject property and attach it to the main entity, or specify the og:image meta tag."
"When choosing your preferred image for use in schema.org markup or the og:image meta tag, follow these best practices: Choose an image that's relevant and representative of the page. Avoid using a generic image (for example, your site logo) or an image with text in the schema.org markup or og:image meta tag. Avoid using an image with an extreme aspect ratio (such as images that are too narrow or overly wide). Use a high resolution, if possible."
"Include compelling, high-quality images in your content that are relevant, especially large images that are more likely to generate visits from Discover. We recommend using images that meet the following specifications: At least 1200 px wide, High resolution (at least 300K), and 16x9 aspect ratio."
Google updated its image SEO documentation to clarify how it selects thumbnail images for Google Search and Discover. Publishers can influence image selection by specifying preferred images through schema.org primaryImageOfPage property, attaching images to main entities, or using og:image meta tags. Best practices include choosing relevant, representative images without generic logos or extreme aspect ratios, using high resolution images, and avoiding text-heavy graphics. For Google Discover specifically, images should be at least 1200 pixels wide, high resolution (minimum 300K), and maintain a 16x9 aspect ratio to maximize engagement and visit generation.
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