DPI (dots per inch) describes output device resolution—how many dots a printer lays down per inch. PPI (pixels per inch) describes image resolution in a file. For print, what matters is that the image has enough pixel data at final size.
Why the distinction matters
If your design app shows "300 DPI" it usually means 300 PPI in the file. The printer then uses that data at its native DPI. Too few pixels at output size and the print looks soft or pixelated.
Setting up for print
Create or export at the final trim size with at least 300 PPI for typical print. Large-format may use 150 PPI or less because viewing distance is greater. Do not scale up a low-PPI image and expect sharp results.
Quick reference
• 300 PPI at final size: standard for offset and digital print.
• 150 PPI or lower: often acceptable for large-format signage.
• Scaling up in layout does not add detail.
Common mistake
Assuming "300 DPI" in a small export is enough when the art is placed at a larger size. Effective PPI drops when you enlarge; we check effective resolution at trim size.