Both paperfree duplicate checking system and other duplicate checking software have their own rules of word count, and many duplicate checking software have different rules of word count. Therefore, we often find that the total number of words marked in our duplicate check report is somewhat different from the number of words counted in our original words. Most papers' duplicate checking software can calculate spaces, and some can also calculate words, so it is not just word count. A letter is a character and a word is a word. The number of words includes words and punctuation, but does not include spaces. The number of characters includes words, punctuation and spaces.