how to center a pdf for printing?

[366841560kd0]

i want to center my prints so at least theres a better chance of both sides aligning a bit better when i print double sided. however, even when i have "auto" selected, the image won't alight to the center of the page, it's just slightly off to the left. is there anything i can do?? 

[try67]

You need to (evenly) crop out the white borders around the image, and then create a new PDF file from it.

[366841560kd0]

even if accounting for bleed? the file itself has even white borders around the full image (its meant to be a zine and folds in half), but the grey border around it seems to determine the placement in how it prints