How to bulk Change File Extension on Windows

Windows. This article will walk you through the process of bulk file extension modification, whether you need to standardise the extensions of a group of files or wish to convert a batch of photos to a new format.

Why Change File Extensions in Bulk?

You might need to modify file extensions in bulk for a number of reasons:

Compatibility: To recognise and open files, some programmes or operating systems need a specific file extension. Compatibility is ensured by switching extensions.

File Organisation: You can improve the efficiency of your file categorization and organisation by renaming file extensions.

Conversion: You could wish to change the format of a collection of files, like changing several JPEG photos to PNG.

Data Recovery: It may be necessary to rename the extensions in order for deleted or corrupted files to be correctly recognised while recovering them.

Steps

  • Create a new .txt document in same dir where other files located

  • rename it ‘change.bat‘
  • open with notepad, add below code and save file
@ECHO OFF
PUSHD .
FOR /R %%d IN (.) DO (
cd "%%d"
IF EXIST *.png (
REN *.png *.jpg
)
)
POPD
  • Note: replace file extension respectively.
  • Run change.bat to change the extension in bulk