ISO A3 vs ISO A4

A side-by-side comparison of ISO A3 and ISO A4: dimensions, aspect ratios, and when each one is the right call.

ISO A3

ISO A4

	ISO A3	ISO A4
Size	11.7 x 16.5 in	8.3 x 11.7 in
Aspect	0.71	0.71
DPI	300	300
Color	CMYK	CMYK
Category	Paper & Print	Paper & Print
Scale note	about the size of a tabloid sheet	about the size of a sheet of office paper
Open	Start	Start