I have A3 PDFs which are 2x2 imposed A5 postcards.
I want to add crop marks to the A3 PDFs.
I used Multivalent to create the A3 PDFs, but it doesn't appear to provide an option to add crop marks.
Does anyone have any idea how I should approach this?
I've seen hints that PDFTK can do this, but have not found any details on their website.
If you can produce an A3 PDF of some crop marks, using a graphics program, you can then overlay it using cpdf:
cpdf -stamp-on cropmarks.pdf input.pdf -o output.pdf