I assume you are asking this refering to commercially available pianos rather than a world record breaking piano.
A concert Grand piano is the biggest piano
Concert Grand Piano
Grand Piano
Baby Grand Piano
Upright Piano
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The largest piano ever built is the Klavins M450 Vertical Concert Grand. Created by the German piano builder David Klavins, this piano stands at an impressive 4.5 meters (14 feet 9 inches) tall. Unlike traditional grand pianos, which have a horizontal design, the Klavins M450 is a vertical piano that allows for longer strings and, consequently, a richer sound. This giant instrument is a unique and rare creation in the world of pianos.