Once you have your picture opened in Photoshop, we are ready to resize.
Step 2: Click on Image menu. On the drop down menu select Image Size (keyboard shortcut: Mac: command+option+i, Win: alt+ctrl+i). For our image we will resize to 700px width. Depending on the size of you image you
We will use the size 720px for our example. You may use either 960px or 2048px. Make sure Constrain Proportions is ticked as this will keep our height proportioned with the width when we resize. This also indicated by the chain icons(circled).
Enter 720 in the width box.