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Paper Size Standards: A4 and Letter Compared

https://web-wiki.win/index.php/Paper_Size_Standards:_A4_and_Letter_Compared

You might think paper is paper, but when your document fits perfectly in a binder or just misses the edge of a printer tray, the difference between A4 and Letter really hits home. A4, used almost everywhere outside North America, is taller and narrower than Letter, which is slightly wider and shorter. They’re both close in size—210mm x 297mm versus 8.5 x 11 inches—but those millimeters and fractions of an inch can change margins, filing, and how a page feels in your hand.