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The maximum size of a PDF compared to Europe.
(sh.itjust.works)
Page dimensions are not limited by the format itself. However, Adobe Acrobat imposes a limit of 15 million in by 15 million in, or 225 trillion in2 (145,161 km2). ๐
A pdf is a piece of paper you can't fold. So zooming or using a different resolution monitor would be like holding a magnifying glass up to a piece of paper but not a copy. They're still the same size one just looks bigger.