We present WebNLP, a web-based tool that combines natural language processing (NLP) functionality from Python NLTK and text visualizations from Voyant in an integrated interface. Language data can be uploaded via the website. The results of the processed data are displayed as plain text, XML markup, or Voyant visualizations in the same website. WebNLP aims at facilitating the usage of NLP tools for users without technical skills and experience with command line interfaces. It also makes up for the shortcomings of the popular text analysis tool Voyant, which, up to this point, is lacking basic NLP features such as lemmatization or POS tagging.