EF Multi File Renamer is a utility for comfortable renaming of numerous files or whole directories (including subfolders) in a processing step. In relation to comparable programs, EF Multi File Renamer stands out by its concept for the clear definition against renaming rules. Select the rule(s) you need for the current task from an extensive set of pre-defined rules. Each rule has its individual settings. Renaming tasks can be implemented clearly with a minimum of efforts. Complex tasks can combine more rules in the desired order as well as several times. The integrated real time preview shows each change of parameters immediately. Defined rules set can be stored and later load. The possibility to deactivate individual rules increases the flexibility and function variety. Rules position in a set can be changed with ease.