Bookbinder's Collator

Bookbinder's Collator opens PDF documents and arranges the pages so that, once printed, the sheets of paper can be folded, gathered into groups called 'signatures', and bound into a book or booklet.

Without this app, the pages would be out of order after assembling the book. You can lay out and design the book with sequential pages in your preferred page-layout application, then use Bookbinder's Collator to order them appropriately before printing.