Bulk Rename Files, Folders and Change Extensions in Windows

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If you have just a few files in a folder, you can rename those files/extensions manually and easily. But if you want to rename tens of files/extensions or even 1000 files/extensions manually, it takes long time to rename. Again if files have no extensions and you want to set an extension for them all at once, so how to do that?

There are two ways to bulk/batch rename files, folders or extension in Windows operating system. You can bulk/batch rename by system command and other option is with external applications.

Bulk Rename by Command

1. Bulk rename multiple files/folders – To bulk rename multiple files/folders, open the folder and select files/folders you want to rename. Press Ctrl + A to select all.

Rename general process

Now Right-click on the first file/folder and then select “Rename” option (see in picture) and then enter your desired name. Having done this, press Enter or click anywhere inside the folder.

Bulk rename folders

Here I’ve renamed it to jump2. By this method, you can rename multiple files/folders but remember that file extension can’t be renamed by this process!

2. Bulk change file extensions – Suppose, you have a folder that has different file formats or extensions like .png, .jpeg, .ico etc. and you want to change all these images to the .jpg file extension.

To begin the process, open the folder, press Alt + D in the folder. Then type cmd and hit Enter, a command window will open. Now type the following in it and hit Enter :

ren *.* *.jpg

Here all my file extensions changed png to jpg format and so easily.

Bulk rename command

3. Bulk add file extensions – If files have no extensions, so how to bulk add file extension to the files?

Windows stores system images/audios without extensions. Automatically updated lock-screen images, background images stores in system directory without extensions. If you want to view/use the files for own purpose, you have to add extensions to the files.

To begin the process, open the folder, press Alt + D in the folder. Then type cmd and hit Enter, a command window will open. Now type the following in it and hit Enter :

ren * *.jpg

It will add .jpg extensions after file names. 😆

Bulk Rename by Application

If you want to do it by an application, Just install AdvancedRenamer application. After install, open the application and do the following change in the application (focus on red lines) –

Bulk rename apps

  1. Select Batch mode Rename and then add files/folders you want to rename
  2. Check the New Name option and select dynamic name tags, I selected 1st and 3rd Default Tags
  3. And finally, Select Apply to “Name and extension“, what is the new name for

Having done this, see preview in “New Filename” section. If you are happy with the preview showing then click on Start Batch on top, the files will be renamed. If not happy then change the “New Name” section.

You can now rename/change multiple files/folders/file-extensions and add file extensions in many ways. Please share your thoughts about the article and comment us describing the problems.

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