How is a Japanese kodachi different from a tanto in terms of size and design?
Updated Feb 2026
The Japanese kodachi and the tanto are both shorter than a full katana, but they differ significantly in length, design lineage, and display character. A tanto is the shortest formal blade in the Japanese sword tradition - typically under 12 inches of blade length - and is associated with close-range use and personal carry across multiple historical periods. A kodachi is longer, falling between the tanto and the wakizashi in the blade length hierarchy, typically running from around 12 to 24 inches of blade. In terms of design lineage, the tanto derives from a distinct tradition of short Japanese blades with its own specific geometric conventions, while the kodachi is directly descended from the older tachi style and shares its curved single-edged blade profile. For collectors, the distinction matters in display terms: a tanto is a compact piece best suited to close inspection and small display setups, while a kodachi is large enough to make a meaningful visual impression on a wall-mounted bracket or a tabletop stand while remaining more manageable than a full-length katana. Our tanto blade collection provides options for comparison.