A katana is considered a long sword. Compared to shorter blades like daggers or short swords, the katana has a relatively long blade length. The typical blade length of a katana ranges from around 60 to 80 centimeters (24 to 31 inches). The blade length, combined with the length of the handle (tsuka), provides a total length of the katana ranging from approximately 100 to 110 centimeters (39 to 43 inches).

The long length of the katana offers several advantages. It allows for increased reach, enabling the wielder to strike opponents from a greater distance. The longer blade also provides better leverage and momentum during swings, enhancing cutting power.

However, it's worth noting that the classification of a sword as "long" or "short" can be subjective and depend on the context of comparison. When compared to longer polearms like naginata or yari, a katana may be considered relatively shorter. On the other hand, compared to shorter blades like tanto or wakizashi, a katana would be regarded as longer.

In summary, a katana is generally considered a long sword due to its longer blade length and overall length compared to shorter blades.