Best LinkedIn post image size
Portrait (1080 × 1350) takes up the most room in the mobile feed, and most people read LinkedIn on their phones. Square (1080 × 1080) is the safe choice if you plan to reuse the image elsewhere. Landscape (1200 × 628) suits link-style posts and newsletters.
Tip: Don’t put a whole paragraph on the image. If someone has to zoom in, they’ll scroll past.