What is DPI?
DPI means dots per inch — how many image dots (pixels) fit into one inch of the printed piece. More DPI at the final size usually means a sharper print when you look up close. Screens often show images around 72 DPI (sometimes up to about 150). For close-view print, about 300 DPI at the final trim size is the ideal target. That is why a file can look fine on a phone and still print soft: the screen and the printed piece use very different DPI needs.

