Size your horizontal photos to a 3:2 ratio, with maximum dimensions of 2000px wide by 1333px tall at a resolution of 72 dpi in RGB color mode before uploading them to your site. Always save photos in .jpg format. Your site will display vertical photos fine (except in the Showcase box), but the formatting of the text around them won’t be as clean.
Vertical photos should be sized at a 2:3 ratio with maximum dimensions of 1333px wide by 2000px tall. The size of the photos in the Showcase area will vary based on which style of Showcase box you have selected; your site will automatically crop photos to fit the Showcase area, if you upload a photo of the wrong dimension.