Minecraft wiki entry for Book_and_Quill, associated text: Using this GUI, the player can write a single book up to 100‌[Java Edition only] or 50‌[Bedrock Edition only] pages long, with up to 798 characters per page, with line breaks counting as two characters. The player can write up to 79,800‌[Java Edition only] or 12,800‌[Bedrock Edition only] characters inside the entire book. No page may be longer than 14 lines and each line can have a width of 57 pixels (see pixel width of each character here).