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How Standard Paper Sizes Work Across Borders

https://atomic-wiki.win/index.php/How_Standard_Paper_Sizes_Work_Across_Borders

Standard paper sizes like A4 and Letter work across borders through international agreements, mainly ISO 216. This system uses a consistent aspect ratio (1:√2), so scaling between sizes (A4 to A5) works perfectly. However, local preferences, like Letter in North America, still cause mismatches, leading to printing headaches or misaligned document margins when files cross borders.