dpi
Also known as: resolution · pixels per inch · PPI
DPI (dots per inch) measures how many ink dots fit in a square inch of print. Most printing uses 300 DPI at the final printed size — anything lower looks pixellated or fuzzy.
Screen images are typically 72 DPI; print needs 300 DPI to look crisp. If you take a 600×600 pixel image and print it at 6″ × 6″, you've effectively reduced its resolution to 100 DPI — visibly soft. Always start with high-resolution source files or vector artwork. Vector graphics (SVG, AI, EPS) scale to any size without losing quality because they're math, not pixels. Our preflight flags any raster image below 250 DPI at final size.