As with all species within the genus Crinia, the eastern sign-bearing froglet is a small ground dwelling frog; reaching a length of 2.3 centimetres (0.91 in).

The ventral surface is dark grey, and marbled in white of varying density.

Due to the high variability in appearance, the eastern sign-bearing froglet cannot easily be distinguished from the common eastern froglet (Crinia signifera) and Sloane's froglet (Crinia sloanei) by dorsal appearance; however, advertisement call and belly colouration can be used to separate the species.

The eastern sign-bearing froglet habits swamps and ponds, and is often found under debris at the edge.

Amplexus takes place at the edge of the breeding sites; eggs are laid in ponds singularly in shallow water.