Page dimensions are not limited by the format itself. However, Adobe Acrobat imposes a limit 15 million inches by 15 million inches, or 225 million square inches (145161 square kilometers)

(Map of Europe with a square with letters "PDF" overlaid on top of Germany)

The maximum size of a PDF compared to Europe
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[–] 3 points 1 year ago

Probably small. If it just had a single circle at each corner it’s just 4 objects with really far positioning values.

You could fill it with more stuff to make it bigger, of course

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