Splitting and Combining R pdf Graphics

A question that often comes across various help lists is how to combine or split an output from an R graphics device. Maybe you have looped/combined multiple visuals into a single pdf to avoid cluttering your working directory and now you want to pull various pages out. Or maybe you have several different pdfs of various sizes you’d like to combine into a single multi page file (example-click here-). This post utilizes 2 short videos to demonstrate combining and splitting R produced pdfs.

This post serves two purposes:

  1. To show Windows users how to combine and split pdf’s (sorry this works only for Windows users)
  2. To challenge R bloggers who use other operating systems to perform the same combine and split tasks


First you’ll need to download PDF24 Editor (a free program)

Click Here

Combining Multiple R pdf Graphics in a Single File

Splitting R pdf Pages into Separate Files

Pretty easy. Now I challenge R bloggers who use Mac and Linux to provide the same “FREE” functionality for their platforms. Ideally, someone has an approach that spans multiple platforms.

If you have an alternate method for any operating system please provide a link to your blog in the comments below.

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About tylerrinker

I am Literacy PhD student with a bent for the quantitative and a passion for R.
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10 Responses to Splitting and Combining R pdf Graphics

  1. Ananda says:


    Your challenge is actually pretty easy. Just install Ghostscript, and make sure it is in your path. Then, to combine PDFs (no matter what size the original pages were), simply do:

    gs -dBATCH -dNOPAUSE -q -sDEVICE=pdfwrite -sOutputFile=output.pdf input1.pdf input2.pdf input3.pdf

    Splitting apart a multi-page PDF to separate pages is similarly easy:

    gs -sDEVICE=pdfwrite -dNOPAUSE -dBATCH -dSAFER \
    -dFirstPage=1 -dLastPage=3 \
    -sOutputFile=output%3d.pdf input.pdf

    This will create files named output001.pdf, output002.pdf, and so on.

    I think the only thing different across platforms is how Ghostscrpit is invoked.

  2. Ananda says:

    Of course, if you want to stick in R, you can also whip up a function like the following using system() (assuming, of course, you already have Ghostscript installed).

    mergePDF <- function(infiles, outfile, os = "UNIX") {
    version = switch(os,
    UNIX = "gs",
    Win32 = "gswin32c",
    Win64 = "gswin64c")
    pre = " -dBATCH -dNOPAUSE -q -sDEVICE=pdfwrite -sOutputFile="
    system(paste(paste(version, pre, outfile, sep = ""), infiles, collapse = " "))

    Then, you can use it as follows (note the format for infiles; the function would probably need to be modified for dealing with files with spaces in the names):

    mergePDF("file1.pdf file2.pdf file3.pdf", "mergefromR.pdf", "Win32")

  3. TomasGreif says:

    Use pdfsam: http://www.pdfsam.org/?page_id=32 Multiplatform, easy to use.

  4. JL says:

    Linux cli: use pdftk. E.g, for joining:

    pdftk in1.pdf in2.pdf cat output out1.pdf

    For splitting use the cat option (see man page of pdftk for plenty of examples)
    I haven’t tested this, but I guess that you can do this from within R using a system() call once you have pdftk installed.


  5. Mathieu says:

    Easy, free (GNU GPL) and cross-platform: pdftk (http://www.pdflabs.com/tools/pdftk-the-pdf-toolkit/). You merge in a few seconds:

    pdftk PDF1.pdf PDF2.pdf PDF3.pdf cat output PDF-merge.pdf

    and you split in a matter of seconds too (in this example, p.1):

    pdftk PDF-merge.pdf cat 1 output PDF1.pdf

    And many more things… Just look at the doc!

  6. odeleongt says:

    pdftk. You can use it from script (e.g. from within R), and is multiplataform (runs on Windows too).

  7. Ananda says:

    For fun:

    splitPDF <- function(infile, outfile, digits) {
    OS = paste(.Platform$OS.type, .Machine$sizeof.pointer, sep = "")
    version = switch(OS,
    unix4 = "gs",
    unix8 = "gs",
    windows4 = "gswin32c",
    windows8 = "gswin64c")
    out = paste(outfile, "%0", digits, "d.pdf", sep = "")
    pre = " -sDEVICE=pdfwrite -dNOPAUSE -dBATCH -dSAFER -sOutputFile="
    system(paste(paste(version, pre, out, sep = ""),
    infile, collapse = " "))

    Note that this function has in-built OS detection (to the degree that might be most commonly required). A similar approach can be used with the earlier function. digits is the number of digits you want as part of the file name. Usage would be:

    splitPDF('"Input File With Spaces In The Name.pdf"', "R-wrote-me", 4)

  8. Tom says:

    Just for the record I use PDF sam in a similar (though not as elegant) way as Ananda. A ghostscript or PDFsam package would be nice!

  9. FrogWave says:

    Nothing beats pdftk, especially not a windows program that is probably going to be maintained only for a short time, and then left abandoned…

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