72 DPI was a long-time screen default. For print, effective density is pixels ÷ finished inches. 72 DPI can suit billboards, not close-viewed photos.
What stays the same
Your file’s pixel count does not change when you pick a different DPI target. You either print larger with lower density or smaller with higher density.
Practical takeaway
Choose DPI based on viewing distance and criticality of detail — then check whether your pixels support that print size.
FAQ
Which should I use for print planning?
Use pixels and target print size. Treat DPI/PPI as the density you want on paper, not as a magic quality switch.