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In the title mol­ecule, C 8 H 9 N 3 O 3 S, the thio­semicarbazide =N—NH—C(=S)—NH— fragment is twist a different degree of twist in the three independent mol­ecules [dihedral angles = 7.6 (1), 11.6 (1) and 20.7 (1)°]. Intra­molecular O—H⋯N and O—H⋯O hydrogen bonds occur. In the crystal, the hydr­oxy and amino groups are hydrogen-bond donors and the O—H⋯O, O—H⋯S and N—H⋯O hydrogen bonds generate a layer motif.

1-(2,3,4-Trihydroxybenzylidene)thiosemicarbazide