What is the largest perfect bound book you can produce? July 12, 2019 19:46 Updated Follow The largest perfect bound book we can produce is 13" x 10" (open size of 26" x 10"). Related articles How do I calculate the spine of my perfect bound book? What is the smallest perfect bound book you can produce? How do I create the cover for my perfect bound books? Cover Setup for a Perfect Bound Book Paper Weights: PT, LB, GSM