The most common and recognized sheet of paper, A4 paper size is 210 x 297 mm. From Word documents to stationery letterheads A4 paper is used on an everyday basis. A4 papers are the universal home printing format, and all laser and inkjet printers.

A3 forms of papers used at work or school, paper size stands at 297 x 420 mm, a similar size but to a tabloid newspaper, it is slightly different in proportions. A4 paper tends to be for posters, plans, charts, and presentations.