Social media image sizes

Facebook

Facebook cover photo: 820px x 360px

facebook-cover-photo-desktop-and-mobile

Google

Google Business Profile Manager cover photo: 2120px x 1192px (16:9)

LinkedIn

LinkedIn business page banner / cover photo: 1128px x 191px

LinkedIn personal banner: 1584px x 396px

LinkedIn post: 1200 x 1200 (square); 1080 x 1350 (portrait)