Does PDF documents have a standard size? Almost all PDF's i have seen has A4 Size,is this the standard size,if not what is the most common size in pixels for PDF document?
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PDF files can contain documents of essentially any size. There is no 'standard'. The most common size in Europe and much of the world is A4 - 210mm x 297mm. In the US it's Letter: 8.5" x 11". Much of PDF content is stored as vectors and will scale, so the size in pixels is dependent of the output device.