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In the structure of the title salt, C 12 H 10 N 3 O 4+ ·C 7 H 3 N 2 O 7− , the cations and the anions are linked by a single N + —H⋯O carbox­yl  hydrogen bond, the discrete cation–anion unit having no inter­molecular associations other than weak cation–anion aromatic ring π–π inter­actions [ring centroid separation = 3.7320 (14) Å] and a number of weak inter-unit aromatic C—H⋯O contacts. An intramolecular C—H⋯O hydrox­yl–carboxyl hydrogen bond occurs in the anion.

2-(2,4-Dinitrobenzyl)pyridinium 2-hydroxy-3,5-dinitrobenzoate