What is the standard printer paper size used worldwide?

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The printer paper size most people use worldwide is A4. A4 paper is 210 mm wide by 297 mm long. Because of these dimensions, this paper size is the perfect choice for tasks ranging from printing documents and assignments to office paperwork. This size falls into the ISO A-series, which is designed so that each successive size in the sequence is half the size of the previous one when folded, i.e., the smaller size corresponds to the smaller sheet. The A4 sheet's dimensions are such that they make it a very nice fit for a wide variety of printers. So, you could find most printers having it as a default setup.