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Editorial Team
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Asked: 2026-06-04T10:22:31+00:00

I’ve created some annotations (Underline, Highlight, Strikeout, Squiggly) in Acrobat and am digging out

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I’ve created some annotations (Underline, Highlight, Strikeout, Squiggly) in Acrobat and am digging out the QuadPoints array to render with. The pdf spec PDF 32000-1:2008 says they are in counter clockwise order, and x1,y1 -> x2,y2 specifies the base of the quadrilateral.

This should look like: BottomLeft, BottomRight, TopRight, TopLeft

Unfortunately, Acrobat seems to create them in a different (and non compliant manner).

It appears as if the order is: TopLeft, TopRight, BottomLeft, BottomRight.

Anyone have insight into this phenomenon? Is it consistent? Am I missing something?

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  1. Editorial Team

    I’ve written a PDF annotation lib for iOS and found the same against-the-spec Acrobat behavior.

    As a bit of further info, the Text Markup annotation also contains an Rect entry as well as the QuadPoints entry. The Rect entry is per the spec, [llx, lly, urx, ury]. So in Acrobat generated Text Markup annotations, the Rect point (llx,lly) is approx the same as the QuadPoints point (x3, y3) when rotation=0. Go figure.

    Interesting the amount of time that can be wasted when the primary company behind a spec writes software that doesn’t follow that spec!

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