[header] How to use preview to remove a background from an image [title] Right-click on the image you want to edit and press open with] preview. [title] Look at the top-right of the window until you see the button with the symbol of a toolbar on it. [step] It is located to the left of the search bar and titled " show markup toolkit. 
" [title] On the drop-down menu, select the second option from the left (the magic wand). [title] Select a portion of the background which you would like to delete by clicking on an area of the background and dragging.