Across the board, vector-based artwork is preferred for large-format printing and sign-making. To create vector artwork, you will need a program like Adobe Illustrator. A vector artwork file ends in .svg, .ai, .eps, or .pdf.  Moreover, online images shared on social media are unsuitable for large-format printing. If your sign contains photographic images, you should use high-resolution files. We recommend using an online file-sharing service like Dropbox for high-resolution files because they’re too big for email.