Generally, it is charged according to the number of words in the full text. For example, 1000 words1.After 5 yuan enters paperfree official website, he can check and retry a robot to reduce the weight of his paper. According to the sentences with high acquaintance in the paper, according to the specialty and similarity ratio of the paper, the extent and effect of weight reduction are different. Machine weight reduction is an aid to manual weight reduction, and some sentences after weight reduction must also be corrected manually.