Entrapta is fairly short and a bit stocky, about as tall as Glimmer, and has olive skin, rose eyes, and long, lilac-colored hair that she wears in pigtails. This hair is prehensile, meaning she can move it around at her own will like limbs. She is always wearing her work attire, consisting of heavy gloves, steel-toed boots, arm covers, a welding mask with red lenses, and a pair of overalls worn like pants. The shoulder straps are left loose over a white undershirt, which has been blotted with grease. Entrapta consistently stays in this outfit, even during Princess Prom. She also conceals a number of devices and gadgets on her person, like "any respectable scientist."

During her time on Beast Island, Entrapta's appearance changes due to the dangerous conditions surrounding her. She sports a new mask with bug like eye-holes (what she sees through), which has a cracked lens as a result of possible trauma. It seemed that she hadn't maintained her hair, her fringe grown out and the ends appearing filthy from the environment. She also gains three small scratches on her left cheek. At that point, Entrapta had her overalls fully on, unlike previous times where it was hanging loose.

After returning from Beast Island, the scratches and dirt are gone, and Entrapta's fringe is trimmed again.