The Zine Arranger is a little web-tool I made to do zine layouts on the computer, so you don't have to manually flip around all of the pages just right before you print. If you have a PDF version of your zine, just load it up on the Zine Arranger, set it up for what size & all you want, and hit Print!
There's also more informaion about using the tool on the itch.io page.