If you become a serious researcher, consider buying a facsimile reprint. offers a reasonably priced paperback of the Summers translation with all plates intact. It is $35 on Amazon. Having the physical book allows you to flip between Book I and Book III without scrolling a clunky PDF.
Suggested further reading (selective)
The text is organized into three distinct books that provide a comprehensive overview of the supernatural as understood in the early modern period. compendium maleficarum pdf
For historians, the Compendium offers a raw window into the 17th-century mind. It shows how Catholic theologians believed the Devil operated. Guazzo was surprisingly "scientific" for his time, attempting to categorize demonic behavior as one would categorize plants or animals. If you become a serious researcher, consider buying