A4 paper size has evolved over time and countries where it is implemented, until today when the paper size A4 is defined by ISO 216.
This paper is the most used in Europe and in the world, the database format.
Most individuals buy and use A4 printers and scanners.
A4 in its most widely used weight (80g / m²) is a leaf of a mass of 5 grams, which dispenses with the use of scales letters if you know the weight of the envelope used.
Paper Size A4 : 210 x 297 mm or 21 x 29.7 cm
Paper Size A4 : 8.3 x 11.7 inches
A4 paper size compared to others paper sizes: