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What is the International paper sizes?
- Jun 25, 2018 -

The international paper size standard is ISO 216. Paper size is based on the German DIN 476 standard for paper sizes. 

ISO paper sizes are all based on a single aspect ratio of the square root of 2, or approximately 1:1.4142. There are different series, as well as several extensions.

The international paper sizes are included in Cascading Style Sheets (CSS): A3, A4, A5, B4, B5.