Stanford CoreNLP is a free Natural Language Processing tool. It processes English language text and provides the base forms of words, parts of speech, indicates whether they are proper names, normalizes dates, times and numeric quantities, and marks up the structure of sentences. This tool integrates all other Stanford NLP tools for English language processing, including parts-of-speech (POS), the named entitiy recognizer (NER), the parser and the coreference resolution system. An online demo is also available.