The Wrinkled Toadlet is a small frog, which varies largely in size. It is smaller on the coast of eastern Australia, and larger inland, ranging from 1.8 to 3.2 centimetres (0.7-1.3 in). The dorsal surface is warty, and grey to brown, with dark markings. The ventral surface is smooth and grey. The parotoid glands and inguinal glands are large in comparison to the size of the frog, and yellowish in colour. Behind each knee, and in the groin are bright orange.
The tadpoles hatch mostly black, with a distinct gold patch behind each eye. As development continues, the gold pigment spreads, until the tadpole is mottled grey and gold.
The Wrinkled Toadlet has mostly unwebbed hands and feet, and the Tympanum is not visible.