Custom posters are perfect for window signage, tradeshows, seminars, classrooms, and more. FedEx Office provides custom poster printing by simply uploading your file or choosing from our design templates. Our poster prints are available in five sizes: 16″ x 20″, 18″x 24″, 22″ x 28″, 24″ x 36″, 36″ x 48,” as well as a variety of laminating and mounting options.