WinExt Bulk Renamer is a 100% FREE file renamer utility for Windows 10/8/7/XP, it is used to rename multiple resources (files and directories) at once. It supports to manage your renaming templates, and a template contains "Pattern", "Start Serial Number" and "Case" settings. In the "Pattern", you can use "*" to describe original filename without extension, use "#" to describe the serial number. In the "Case" setting, you can capitalize the first letter, change filename and / or extension to lowercase / UPPERCASE. Also, it has a preview list to review your bulk renaming settings before do the permanent renaming. At last, this batch renaming tool just is a sub product of WinExt, the second one have many file / folder related features, sure, contains bulk renaming.