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In this paper, an algorithm to normalize noisy text, which only focuses on the Arabic language, is introduced. Although there have been many theories that discuss Arabic text processing, there has not been, so far, one theory that focuses on noisy Arabic texts. Additionally, this paper introduces a new similarity measure to stem Arabic noisy document. The need for such a new measure stems from the fact that the common rules applied in stemming cannot be applied on noisy texts, which do not conform to the known grammatical rules and have various spelling mistakes. Thus, the proposed normalization algorithm automatically group words after applying the similarity measure. In order to make sure of such a theory of algorithm, the new normalization technique is evaluated by the under-stemming errors reduction technique introduced by Paice.