Batch change/rename file extensions in windows

Today I need to rename a batch of file about >100 file from .jpg to .png for the testing of application purposes. Google around and found this free solution which make my life easy.

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Select the folder where the file where the extension to be change and press Shirt and Right-click on the folder, and than select Open Command Window Here

You will now see a Command Window with the current folderdirectory open. Now type the following command line,

ren *.(current extension name) *.(extension you want)

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Since I want to change the extension from .jpg to .jpg, in my case the command line would be,

ren *.jpg *.jpg

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Now all the files inside the folder will change to the extension you want. It’s that simple.