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Editorial Team
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Asked: 2026-06-09T11:14:31+00:00

For creating PDF documents in iOS, in the official documentation ( http://developer.apple.com/library/ios/#documentation/2DDrawing/Conceptual/DrawingPrintingiOS/GeneratingPDF/GeneratingPDF.html#//apple_ref/doc/uid/TP40010156-CH10-SW3 ), the

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For creating PDF documents in iOS, in the official documentation (http://developer.apple.com/library/ios/#documentation/2DDrawing/Conceptual/DrawingPrintingiOS/GeneratingPDF/GeneratingPDF.html#//apple_ref/doc/uid/TP40010156-CH10-SW3), the default size is given as 612×792, which has a ratio of 1.29412.

// Create the PDF context using the default page size of 612 x 792.
UIGraphicsBeginPDFContextToFile(pdfFileName, CGRectZero, nil);
CFRange currentRange = CFRangeMake(0, 0);
NSInteger currentPage = 0;
BOOL done = NO;
do {
// Mark the beginning of a new page.
   UIGraphicsBeginPDFPageWithInfo(CGRectMake(0, 0, 612, 792), nil);

However, default size of an A4 paper of international standard IS0216 is 210x297mm, which has an aspect ratio of 1.41429. So, my questions are:
What is the unit of Apple’s standard?
Is this 612×792 dimension identical with A4?
Are the printing margins, etc., included?

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1 Answer

  1. Editorial Team

    PDF and PostScript use “PostScript points” as a unit. A PostScript point is 1/72 inch. So the default page size is

    612 x 792 points = 8.5 x 11 inch = 215.9 mm x 279.4 mm

    This is the US Letter paper size.

    The bounds rectangle in UIGraphicsBeginPDFPageWithInfo() defines the so-called “media box” of the PDF page. The media box is the size of the medium on which the page should be printed and therefore includes the margins.

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