CJoin is a Windows utility for joining multiple CSV files by matching values in selected columns. You can load separate CSV files, define the columns used as join conditions, select the columns to include in the result, and export the combined data as a new CSV file. No database or programming knowledge is required. CJoin is useful for combining customer lists, product catalogs, sales records, inventory data, management tables, and other information stored across separate CSV files. Built-in text conversion features help prepare inconsistent data before joining. You can replace text, trim spaces, add fixed values, extract part of a string, and preview converted values. CJoin provides a simple desktop workflow for CSV merging, data preparation, and everyday business data processing.