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In order to use my university's printing shop, they said they need a PDF x-1a format. I noticed in Pages that I can print as "Save as PDF-X" but a little googling says this is not exactly the PDF x1a format, but another one. Googling did not turn up exactly how to get the x-1a format.

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It seems that with Mavericks 10.9 (and as early as Lion 10.7?) that the "Save as PDF-X" is no longer an option. I have started a question for that: – j-beda Dec 5 '14 at 16:37
up vote 2 down vote accepted

If they can take PDF-X1/a, then they can take any of the others as well; you shouldn't have any problems.

PDF-X1/a was simply the first in a long line of iterations of a new PDF schema that basically does a lot of preflighting for you (it's one of the best things to happen in the printing industry in a long time). It means your document is "press ready", which mainly applies to SWOP presses but can apply to small printers as well.

As a footnote to all of that... You can also output press-ready PDFs using the Mac OS X-supplied "Save as PDF" button in the print dialog box from just about any application.

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