This web service performs dependency parsing in Spanish using a Malt Parser instance.It parses plain texts introduced by the user and generates linguistically annotated Treebank instances based on a data-driven parsing model.The parsing model is induced from de dependency-annotated IULA Treebank (Marimon et al, 2012) using the language-independent MaltParser 2 system as a dependency model trainer (Nivre et al, 2007).This Treebank contains 589,542 tokens in 42,099.In order to achieve optimal performance, the training corpus was previously analyzed with MaltOptimizer 3 (Ballesteros and Nivre, 2012), a tool developed to set the best parameters for MaltParser. Inputs, outputs and formats InputsThe input to be parsed is a plain text encoded in UTF-8.It can be introduced directly as a text instance in the dialogue box, as a text file or as a URL.The input language available at this moment in the web service is Spanish (es).