* Images should be at least 1200 pixels wide if the height is 800px, as of May 26, 2020. It's a matter of math. * Every page is required to include at least one image (whether or not you include markup). Google will pick the best image to display in Search results based on the aspect ratio and resolution. * Image URLs must be crawlable, make sense, relate to the post, and be indexable. * Images must represent the marked-up content. * Images must be in BMP, GIF, JPEG, PNG, WebP, and SVG format for JSON-LD implementation for eCommerce schema. Developers may also inline images as Data URIs. Data URIs provide a way to include a file, such as an image, inline by setting the src of an img element as a Base64 encoded string. * For best results, provide multiple high-resolution images (minimum of 50K pixels when multiplying width and height) with the following aspect ratios: 16x9, 4x3, and 1x1. (Google updated thier documentation on Auguest 22, 2022. Formerly it was a minimum of 800,000 pixels when multiplying width and height.)