Neutrophil extracellular traps (NETs) are extracellular DNAs decorated with nuclear and granular proteins such as histones, neutrophil elastase or myeloperoxidase. They exhibit fibrous mesh-like, web-like, or string-like structures. Here, we describe our protocol regarding visualization of ex vivo NETs released from neutrophils activated by lipopolysaccharide (LPS) using fluorescence microscopy.