PDFN Batch File Rename Utility

This is a free Windows application that can rename multiple files.

Included features:

Rename all files a directory, or all files in all subdirectories (recursively)
Option to skip hidden files
Option to keep a log of all renamed files
Undo the previous rename operation if any errors happened
Easy to use presets:
- File count
- Change to all lower or upper case
- Make web-friendly
- Add a prefix or a suffix
- Last modified date
- Unique random letters and numbers
Completely customizable, see the product manual for details about advanced settings.