In the cation of the title compound, C5H8N3+·Cl-, the C-N(H2) bond distance [1.348 (3) Å] is at the lower end of the range for aryl amines. In the crystal structure, cations and anions are linked via N-Hhttps://scripts.iucr.org/logos/entities/ctdot_rmgif.gifCl hydrogen bonds, forming one-dimensional chains along [100].