Daram Renamer is a portable app to change file or directory names in batch.

Daram Renamer is a well laid out app that's easy to navigate. There's no file menu, so you'll need to get used to the icons, but they are easy to understand. Click on the folder to get started and select the files and folder you want to rename.

You will now find a dozen or so options that might take a few minutes to get used to the icons. But, be sure to use your right-click on any file or folder to discover at least a couple dozen more choices. Some of these include filename process, extension process, number process, date process, path process, properties process, and batch process. Each of these has numerous sub-menu choices.

Features:

Renaming Options
Replace Plain Text
Concatenate Text
Trimming Filename
Delete Blocked Text
Delete Filename
Substring
Casecast Filename
Add Extension
Delete Extension
Change Extension
Casecast Extension
Delete without Numbers
Matching Number count
Add Index Numbers
Numbers Increase or Decrease
Add Date
Other Options
Drag&Drop
Context Menu
Sort
Undo
Redo
Copy Mode (renamed files are copied)
Move Mode (files are renamed)

As batch renaming apps go, Daram Renamer packs quite a punch in a very small download.