The asymmetric unit of the title compound, C(9)H(9)N(3)S, contains two crystallographically independent mol-ecules, in which the thia-diazole and tolyl rings are oriented at dihedral angles of 32.25 (3) and 74.50 (3)°. An intra-molecular C-H⋯S inter-action results in the formation of a five-membered ring. In the crystal structure, inter-molecular N-H⋯N hydrogen bonds link the mol-ecules into chains along the a axis. A π-π contact between the thia-diazole rings [centroid-centroid distance = 3.910 (3) Å] may further stabilize the structure. There is also a weak C-H⋯π inter-action.