问题
I have many (around 1000) multiple-page PDFs for a program I am writing.
The problem is that many of them are inconsistent about page size, even within the same document at times. Does anyone know of a way I could programmatically go through the files and resize the pages to what I want? This can be in any language.
I can accomplish this in Adobe Acrobat Pro, but there are so many that would end up taking a long, long time. The only way I can get it to resize there is to add a background from a file, and then choosing the file i want to resize.
回答1:
Generally, PDFtk is a good fit for this kind of problems. It will let you pull everything apart, and reorder/resize/modify pages on the command line.
回答2:
I had a similar problem and could easily solve it with PDF split and merge, a Java based toolkit for editing PDF files.
回答3:
You can resize a PDF with a command line tool, Ghostscript.
Assuming you want to resize a PDF to 306x396 points (which would give you a quarter of a letter sized pages), do it like this:
gs \
-o 306x396-points.pdf \
-sDEVICE=pdfwrite \
-g3060x3960 \
-dPDFFitPage \
-dUseCropBox \
input.pdf
Note that the -g.... dimensions are in pixels. Because Ghostscript internally computes with 720 PPI by default, these are increased by a factor of 10 as compared to the sizes in points.
For Windows, use gswin32c.exe or gswin64c.exe instead of gs.
来源：https://stackoverflow.com/questions/17306509/resize-many-pdfs