DataPreparator is a software tool that can be used to help with data preparation, or data preprocessing, in data analysis and/or data mining. DataPreparator is a free software tool that can help you prepare and explore data in different ways before data analysis or data mining. It has operators for cleaning and discretization, numeration. Scaling, attribute selection, missing values. outliers, statistics. Visualization, balancing, sampling, row selection and many other tasks. Access data from text files, relational database, and Excel workbooks. Large volumes of data can be handled (data sets are not stored in computer memory, except for Excel workbooks and result set of some databases that do not support data streaming). It can be used alone, without the need for any other tools. A graphical user interface that is easy to use. Operator chaining allows you to create preprocessing transformation sequences (operator tree). Model tree creation for execution/test data.