File Renamer is a free utility that can rename many files at a time. Rename all your files instantly. You can sort your files, rename it and modify the strings easily.




For more complex renaming action, you can add your own script. It has the undo function so that you don't have to worry if something gone wrong.
















And you can download this software for free :D

File size: 420 KB (freeware)
OS: Windows all

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oh wait you might wanna check this too :D