It depends on the user and his purpose for using postcards. For events and party invitations, the regular postcard is suitable in all aspects. Business promotion and marketing need a little more space to squeeze promotional speech, product identities, and brand motifs. So, they need jumbo or giant postcards to keep it stand and effective. However, you can design random shapes, sizes, and designs to suit the postcard you want to design. scroll up if you don’t know about the different types of postcards.