Change PDF page dimension without scaling content

[Rob Ehle]

Very simple problem I can't find the answer to: We have a book that printed 8 x 9 when it was printed offset, and our digital printer can't accommodate that trim size. I want to edit the PDF to add 1/4" to the top and 3/4" to the bottom so the text block will look ok in an 8 x 10 trim. A kind of "reverse crop." I'm going to feel stupid when someone gives me the obvious answer.

So be it, and thanks in advance.

Rob

[Bernd Alheit]

Use the Crop Tool in Adobe Acrobat Pro. There you can increase the page size.

[Rob Ehle]

This is what I tried at first. But I'm still doing something wrong. I'm trying to change the page size from 8 x 9 to 8 x 10, and offsetting the y-axis by 1/4", to have all the objects sit 1/4" lower on the new page than they do on the old one. I'm being told the page can't be reduced. I'm misunderstanding something . . .

[Bernd Alheit]

The trim box is 8x9. What is the page size?

[Rob Ehle]

The document's original page size is 8x9. And so I take it the trim box is 8x9 as well, right? I want the new PDF dimension to be 8x10. I want 1/4" added to the top margin, and 3/4" to the bottom.

[Bernd Alheit]

What happens when you click on the button "Set to Zero" ?

[Rob Ehle]

Five weeks later . . . (apologies, long story)

Setting to zero adds the 1/8" bleed margin to the full page size, as far as I can tell, which isn't what I want to do.