windows rename files to lowercase   

In this post:

• Rename extensions to lower case
• Rename extensions to upper case
• Rename whole file names
• Rename with Powershell (after Windows 7)

Rename extensions to lower case

Rename all files with extension .TXT to .txt

ren *.TXT *.txt

navigate to the directory with the files for renaming and run the command ren :

cd C:\folder
ren *.TXT *.txt 
pause

Rename extensions to upper case

Rename all files with extension .csv to .CSV

ren *.csv *.CSV 

Rename whole file names

The script below

cd C:\folder
for /f "Tokens=*" %f in ('dir /l/b/a-d') do (rename "%f" "%f")
pause

Rename with Powershell (after Windows 7)

The script below is applicable for Windows 7 and above because Windows PowerShell. In order to start PowerShell :

• go to start menu
• search for PowerShell
• then execute

Get-ChildItem "C:\folder" -recurse | 
  Where {-Not $_.PSIsContainer} | 
  Rename-Item -NewName {$_.FullName.ToLower()}