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Abstract The Codex Gigas, known as the "Devil's Bible," is the largest extant medieval illuminated manuscript in the world. Created in the early 13th century in Bohemia, this codex has captivated historians, theologians, and the public due to its immense size, unified handwriting, and the infamous full-page portrait of the Devil. In the 21st century, the manuscript has undergone complete digitization, making high-fidelity facsimiles available online. This paper examines the history and physical characteristics of the Codex Gigas, analyzes the content that led to its demonic epithet, and critically discusses the availability and scholarly use of English-language PDF versions derived from the National Library of Sweden’s digital collection. 1. Introduction For centuries, the Codex Gigas (Latin for "Giant Book") was shrouded in legend. Measuring 92 cm (36 in) tall, 50 cm (20 in) wide, and 22 cm (8.6 in) thick, and weighing approximately 75 kg (165 lb), it required multiple people to move it. According to medieval legend, a monk who broke his vows promised to write a book containing all human knowledge in a single night to avoid being walled alive. Unable to complete the task, he sold his soul to the Devil, who finished the illustration. Hence, the book contains a striking portrait of the Devil, and the legend explains why the text appears unnaturally uniform.