Perfect binding is the process required for binding publications when the combined paper thickness is too thick to be stapled in a saddle-stitched form. Smaller publications can be also perfect bound if desired for a more finished effect.

Signatures are formed in the same way as saddle-stitched forms, except they are stacked instead of wrapped around each other. The spines of the stacks of signatures are then torn to allow the glue to adhere to the pages better. They are then compressed in a clamp and hot-glued at the spine; a cover is then wrapped around the finished book and the entire piece is trimmed on three sides.