Banners are often viewed from far away. 100 DPI or less can work — always check pixels ÷ finished width.
Recommended DPI for banner
Start around 100 DPI, then adjust for size and viewing distance. Fine detail and text need higher DPI than soft photographic backgrounds.
Pixels still matter most
Pick the final print size first, multiply by target DPI, and check whether your file has enough pixels on the short side.
FAQ
What DPI do I need for banner?
Often around 100 DPI, but large pieces viewed from farther away can use less.