A4 paper is defined by ISO 2 16, and its specification is 2 10 mm× 297 mm. Most countries in the world have adopted this international standard of paper size.
The measured size of a4 paper is (length * width) 297mm×2 10mm, and the paper width is even longer than a 2b pencil. In other words, a4 paper is actually half that of a3 paper, and a3 paper is 420mm long and folded in half, which is the size of a4 paper. A4 paper is mainly used for printing and copying drawings, and A4 paper is usually used for recording documents.
Common specifications and dimensions:
When the resolution is 72 pixels/inch, the pixel length and width of A4 paper are 842×595 respectively.
When the resolution is 100 pixels/inch, the pixel length and width of A4 paper are 1 169×827 respectively.
When the resolution is 120 pixels/inch, the pixel length and width of A4 paper are 1403×992 respectively.
When the resolution is 150 pixels/inch, the pixel length and width of A4 paper are 1754× 1240, respectively.
When the resolution is 300 pixels/inch, the pixel length and width of A4 paper are 3508×2479 respectively.