All social and SEO plugins – except one that I know of – use the full size image URL from the WordPress media library when adding image meta tags to the webpage (ie. og:image, twitter:image, etc.), and/or adding images to Schema JSON-LD markup for the webpage. This can be problematic for several reasons… The image resolution may be too small.
The image resolution may be too large and the file size too big.
The aspect ratio (width or height) may exceed a maximum value.
The image displayed on the social / search site is center cropped.
For example, Facebook requires an image of at least 200x200px, images for the Google Article Rich Card must be larger than 696x279px, and WhatsApp recommends images of 300x200px or larger. Facebook also ignores images with aspect ratios over 3:1, and Google will ignore images that exceed 2.5:1.
Facebook displays shared links differently depending on the available image resolution – shared links will include a small thumbnail if the image is too small, and shared links with larger images may appear fuzzy on high-resolution displays if the image is not at least 1200x630px (Facebook’s recommended image size).
Most social and
Source: https://managewp.org/articles/18416/why-specific-image-sizes-for-social-sharing-and-seo
source https://williechiu40.wordpress.com/2019/03/03/why-specific-image-sizes-for-social-sharing-and-seo/
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