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There are two layouts to the PDF files: non-linearized (not "optimized") and linearized ("optimized"). Non-linearized PDF files can be smaller than their linear counterparts, though they are slower to access because portions of the data required to assemble pages of the document are scattered throughout the PDF file. Linearized PDF files (also called "optimized" or "web optimized" PDF files) are constructed in a manner that enables them to be read in a Web browser plugin without waiting for the entire file to download, since all objects required for the first page to display are optimally organized at the start of the file.<ref name="pdf-ref">{{cite web|url=https://www.adobe.com/devnet/pdf/pdf_reference.html|title=Adobe Developer Connection: PDF Reference and Adobe Extensions to the PDF Specification|publisher=Adobe Systems Inc.|access-date=December 13, 2010|url-status=dead|archive-url=https://web.archive.org/web/20061115132507/https://www.adobe.com/devnet/pdf/pdf_reference.html|archive-date=November 15, 2006}}</ref> PDF files may be optimized using [[Adobe Acrobat]] software or [[QPDF]].
Page dimensions are not limited by the format itself. However, Adobe Acrobat imposes a limit of 15 million by 15 million inches, or 225 trillion in<sup>2</sup> (145,161 km<sup>2</sup>).<ref name="pdf-ref-1.7" />{{
== Imaging model ==
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