We present a method of grouping documents with genetic algorithms, the groups are created from the tokens representing the document. The system select the tokens starting from the Goffman point, selecting an area of suitable transition making use for it of the Zipf law. The experiments are carried out with the collection Reuters 21578 and the genetic algorithm uses the new operators designed to find the affinity and similarity of the documents without having prior knowledge of other characteristics. The proposed method is an alternative to the methods of traditional clustering and the results show that genetic algorithm is robust, clustering the documents in the collection of documents efficiently. © 2009 Springer Berlin Heidelberg.