Articles are usually subjected to editing even if they were previously peer-reviewed. In fact, articles are usually edited for a couple of times to eliminate their probable errors. The editing process of a journal highly depends on financial resources. The journals with limited budget usually employ one editor or ask their general editorial board to do the editing. In such cases, a member of an editorial board may voluntarily provide editing services which lead to a high volume of tasks. On the other hand, they might not be highly skillful in editing resulting in obvious mistakes. In this regard, editing services are mainly provided in three different types.