Quarto
Book & Publishing Formats · 6 specs
Direct Answer
A Quarto (abbreviated 4to or 4°) is a classical book format created by folding a printer's sheet twice—first in half across length, then in half across width—producing 4 leaves (8 printed pages). Measuring approximately 9.5 × 12 inches (241 × 305 mm), it is famous as the original publication format for individual Renaissance theatrical plays and illustrated scientific treatises.
Source: Bibliographical Society / International League of Antiquarian Booksellers · Last reviewed Aug 28, 2026
Specs
| Folding Structure | 2 perpendicular folds |
| Leaf and Page Yield | 4 leaves (8 printed pages per master sheet) |
| Typical Dimensions | Approx. 9.5 × 12.0 inches (241 × 305 mm) |
| Chain Line Orientation | Horizontal chain lines in hand-made antique paper |
| Historical Significance | Original Shakespeare single-play editions ('Good Quartos' and 'Bad Quartos') |
| Modern Publishing Use | Illustrated children's books, art monographs, architectural design portfolios |
The Renaissance Playbook Format
While grand Folios were expensive luxury library centerpieces, Quartos were affordable, portable playbooks sold to London theatergoers outside the Globe Theatre for sixpence. Between 1594 and 1622, almost all of Shakespeare's individual plays (Hamlet, Romeo and Juliet, King Lear) were first introduced in Quarto editions.