LX-DepParser is a free online service for the syntactic analysis of Portuguese. It allows the automatic parsing of sentences in Portuguese in terms of the grammatical functions of their words.
This service was developed and is maintained at the University of Lisbon by the NLX-Speech and Natural Language Group, Department of Informatics.

LX-DepParser is a MSTParser trained with Portuguese data.

For the training of the parser, 22,118 sentences were used (comprising 250,056 word tokens). The sentences were taken from the CINTIL-DependencyBank. This treebank is being developed and maintained at the University of Lisbon by the NLX-Speech and Natural Language Group of the Department of Informatics. In terms of evaluation, LX-DepParser's UAS (unlabeled attachment score) is 94.42 and its LAS (labeled attachment score) is 91.23. Scores were obtained through 10-fold cross-validation.