The biggest sword in history is often attributed to the Zweihander, a two-handed sword that was used in Europe during the late medieval and Renaissance periods. The term "Zweihander" means "two-hander" in German, referring to its characteristic feature of requiring both hands to wield effectively. The Zweihander typically had a massive blade and an elongated handle, allowing the wielder to deliver powerful strikes and cuts.

The exact size and measurements of Zweihander swords can vary, but they were known for their impressive length. Some examples of Zweihanders were reported to measure over six feet (around 183 centimeters) in length. These swords were often used by skilled warriors to engage multiple opponents or to break through enemy formations.

It's important to note that while the Zweihander is often associated with being one of the largest swords in history, there were other large swords used in different cultures and time periods. The Nodachi, a long Japanese sword, and the Claymore, a Scottish two-handed sword, are other examples of notable large swords. The sizes of these swords can vary, and the "biggest" sword can depend on specific measurements, designs, and the cultural context in which they were used.