Dimensions. A4 size in millimetres is 210mm x 297mm. A4 size in inches is 8.3in x 11.7in.
One may also ask, how many pixels is a page of paper?
Since every inch contains 300 pixels, that means that your 8.5”x11” file should be: 2550 pixels wide (300 pixels/inch * 8.5 inches) and. 3300 pixels tall (300 pixels/inch * 11 inches)
Likewise, what is photo size A4? A4 photo prints measure 11.7 x 8.3 inches or 29.7 x 21 centimetres.