Is there a way to automate the mirroring of parboxes every time a new page occurs?

I have a \documentclass{book} that consists of two side-by-side \parbox. I would like one of the \parbox to always remain the "outer" and the other to always remain the "inner". The pages should essentially mirror each other.

In this example, I would like the skinny column to always be the inner column: enter image description here







  • 2
    Does your document only contain these \parboxes? Do you always insert these the same way? Is there any flow from one page to the next?
    – Werner
    Commented Mar 7, 2017 at 4:06
  • You can also do this using paracol. See tex.stackexchange.com/questions/320065/… for example. Commented Mar 7, 2017 at 4:31
  • @Werner, yes, let's assume that the document contains only the \parboxes, the content within them will be of different lengths, and there is flow from one page to the next.
    – AML
    Commented Mar 7, 2017 at 10:46
  • @John, do you think paracol is a better solution here? Would you please propose an example solution?
    – AML
    Commented Mar 7, 2017 at 11:12
  • @JohnKormylo I figured out what you meant: \twosided[pc]% swap margins and columns under \usepackage{paracol}. Does anyone know how to achieve the same thing but with \parbox?
    – AML
    Commented Mar 7, 2017 at 13:18

1 Answer 1


The \parbox macros are optional. Their only effect here is to force a \newpage if there is not enough space for the whole thing. Alignment is handled by \switchcolumn*. (Without the \parbox you should use \sloppy.)


\twosided[pc]% swap margins and columns



Here is a solution using the ifoddpage package. It takes two runs, since \checkoddpage stores the page number in the aux file. The \makebox is used to force the page change before testing.


\newcommand{\swapboxes}[2]% #1 = wide text, #2 = narrow text





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