Print Resolution for Viewing Distance
Find the resolution needed for a print based on how far away it will be viewed, and the largest print your pixels allow, free online.
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The eye resolves about 1 arcminute, so the minimum useful pixels per inch is ≈ 3438 ÷ viewing distance (in inches). A print viewed at 12 in needs 286 ppi; a poster viewed from 6 ft (72 in) needs only 48 ppi. Enter your image's pixel dimensions to see the biggest sharp print.