How-To Geek

Pixels Per Inch (PPI)

Just like DPI (Dots Per Inch) refers to the resolution of a printer’s output, PPI (Pixels Per Inch) refers to the resolution of a display screen. Historically, the PPI of computer displays was fairly low (the CRT monitors that dominated the computer display market up until the early 2000s, for example, generally had a PPI of around 60-100). The introduction of LCDs pushed the PPI above 100, and the PPI value of displays large and small have been increasing ever since (the Retina Display on the iPhone has a PPI of 326, and the HTC One sports a PPI of 468).

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