Jacobi wrote scores of tales for all the best-known magazines of fantasy and science fiction and was represented in numerous anthologies of imaginative fiction published in the United States, England and New Zealand. His stories were translated into French, Swedish, Danish and Dutch. Many of his tales were published in anthologies edited by Derleth, and Arkham House published his first three short story collections. Stories also appeared in such magazines as "Short Stories", "Railroad Magazine", "The Toronto Star", "Wonder Stories", "MacLean's magazine", "Ghost Stories", "Strange Stories", "Thrilling Mystery", "Startling Stories", "Complete Stories", "Top-Notch" and others. Though best known for his macabre fiction, Jacobi also wrote science fiction, weird-menace yarns and adventure stories.