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The title compound, C7H7N3, is an ortho­rhom­bic polymorph that crystallizes in the space group Pca21. The previously reported monoclinic form [Geiger & Parsons (2013) Acta Cryst. E69, o452] crystallizes in the space group P21/c (Z = 4). In the crystal, two independent HN—H...N[triple bond]C hydrogen bonds link the mol­ecules into chains along the a-glide plane. Two further independent HN—H...NH2 hydrogen bonds join the chains, forming a three-dimensional network.
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