Download “Save PDF Pages as Images.app” (219 KB; Mac OS X 10.5 required)

When you run the application, it begins by prompting you to select a PDF file. You can select any sort of file, but nothing much will happen if it’s not a PDF.

Next you can choose the output image format. 150 DPI PNG is the default format. I don’t think the compression setting applies to PNG images, but it does apply to JPEGs.

Rendering the images may take a moment. Then you’ll be asked to define how the output files should be named. I recommend the “Make Sequential” option. By default, page images from a three-page document will be named page-01.png, page-02.png, and page-03.png.

Lastly, you can choose where to save the results. Choose “Other…” from the menu to select a folder that doesn’t appear among the default locations.

Now you have an image of each page in the PDF.

Until such time as this binary is available directly from the official pdftk site, you can get it here:

Download pdftk 1.41 for Intel Macs 1MB

Note: the default pdftk Makefile settings result in a binary that still relies on gcj. Until such time as this issue is resolved, the binary probably won’t be much use!

Building pdftk requires gcj, which comes with gcc, but apparently not with Mac OS X. So, I downloaded and built GCC 4.2.2. Why 4.2.2? Because it was the most recent version.

./configure --prefix=/usr/local/gcc/4.2.2 --disable-multilib
make
make install

The --prefix option installs everything out of the way in its own little directory; I wasn’t really interested in upgrading to a new version of gcc just to build pdftk. The --disable-multilib option turns off some crap that caused build errors.

Once that’s done, building pdftk is just a matter of pointing the makefile at the new gcc stuff.

cd pdftk
# In Makefile.MacOSX, define TOOLPATH=/usr/local/gcc/4.2.2/bin/
make -f Makefile.MacOSX
make install

So that’s how you roll your own.

Download

Installation instructions and other notes are included with the downloads.

• strpdf-1.0-mac.zip (1.9M) Requires Mac OS X 10.4; untested on Mac OS X 10.5.
• strpdf-1.0-win.zip (640K) Untested, but might work at the Windows command prompt.
• strpdf-1.0-kit.zip (95K) Requires a Tclkit for your platform (8.4.16 recommended).

Usage

Strings are placed on the page with the -text option. General configuration options must be given before the first -text option. PDF data is printed to stdout, so redirection should be used to capture the result.

Here is a simple example:

strpdf -text 'Hello, world!' center middle > helloworld.pdf

The -text option has three parameters. The first is the string to print. The second and third specify the horizontal and vertical locations of the string on the page, respectively. Valid horizontal positions are left, center, and right. Valid vertical positions are top, middle, and bottom. The left, right, top, and bottom positions must each be followed by an additional parameter which specifies the distance from the indicated edge of the page to the closest side of the string.

Multiple instances of the -text option can be used to place multiple strings on the page:

strpdf -text 'Upper right' right 0.5 top 0.5 -text 'Lower left' left 0.5 bottom 0.5 > corners.pdf

The default page size is 8.5 × 11 inches (letter). The -paper option understands a few other common paper sizes, which can be listed with strpdf paper:

strpdf -paper a4 -text 'A4 FTW' center top 1 > a4.pdf

Alternatively, arbitrary page dimensions can be specified with the -width and -height options:

strpdf -width 5 -height 5 -text 'Square' center middle > square.pdf

By default, page dimensions and string position parameters are interpreted as inches. The -units option allows these values to be given in millimeters or points. The supported -units parameters are mm, pt, and in.

The -orient option provides a landscape mode that swaps the width and height of the page. This can be done manually with the -width and -height options, but the landscape option is convenient for use with preset paper sizes:

strpdf -paper legal -orient landscape -text 'Legal fine print' center bottom 0.5 > landscape.pdf

The default font is 12-point Helvetica. The -size option sets the font size (in points) and the -font option sets the font face. If given before the first -text string, these options set the default font. Given after the parameters of a particular -text option, they modify only that string:

strpdf -font Times-Roman -size 18 -text 'One' left 1 top 1 -text 'Two' center top 1 -size 24 -font Courier -text 'Three' right 1 top 1 > fonts.pdf

Valid font faces can be listed with strpdf font. Valid fonts are not necessarily available on your computer, nor are the fonts on your computer necessarily compatible with strpdf.

There is a -compress option which will compress the PDF data if given the
parameter 1, but in most cases it yields little benefit. For small files such
as the examples on this page, compression may actually result in slightly larger files.

Applications

I use strpdf in conjunction with pdftk to “stamp” otherwise static PDF documents with bits of variable text. Because these are both free command line utilities, the process is easily automated and requires no commercial software. Here a registration string is stamped on each page of a report:

strpdf -text 'Registered to John Doe' center top 0.25 > registration.pdf
pdftk document.pdf stamp registration.pdf output registered-document.pdf

Alternatively, strpdf’s output can be piped directly to pdftk:

strpdf -text 'Registered to John Doe' center top 0.25 | pdftk document.pdf stamp - output registered-document.pdf