Comments on: How to batch change file extensions for Windows files

By: Josh Heglund

Josh Heglund — Fri, 02 Jul 2010 05:47:20 +0000

You can do it really easily in PowerShell! (Included in Windows 7 / Windows Vista). This will do it recursively for all directories below too, so use wisely.

To rename a “.jpg” to a “.new” you can do the following:

Get-ChildItem . -Recurse *.jpg | Rename-Item -newname { $_.name -replace ‘\.jpg’,’.new’ }

It’s important to leave the “\” in there too (as an escape character…)

By: Designer

Designer — Sat, 26 Jun 2010 04:25:12 +0000

Thanks! The action script I had made in Photoshop had exported all of my files to .jpg.jpg. Looking at the hundreds of photos with this extension, I was not very excited at the prospect of renaming everything. The instructions below took care of it! Thanks for posting these instructions – I wouldn’t have thought of it, even though it’s a simple concept.

There’s an easier way (in Vista):

Shift-right-click in the folder containing the files to be renamed.

Click on “Open Command Window Here.”

In the Command Window, type the DOS command for file renaming, as applicable: i.e.: ren *.jpgjpg *.jpg

By: Chris

Chris — Sat, 19 Jun 2010 13:50:26 +0000

I haven’t seen my problem here. I have a bunch of machine embroidery designs that always download with as a “TGZ” file type and a “tgz” extension. For example: Christmasangels.zip.tgz” Embroidery software won’t recognize them until I eliminate the “tgz.” How would I batch rename to eliminate an extension as opposed to changing it?

Thanks.

Also, if anyone knows why “tgz” attaches itself to these files, I’d love to know. The webmaster says it’s my anti-virus/internet security program and Trend Micro says it’s the website.

By: xyz

xyz — Thu, 17 Jun 2010 12:17:16 +0000

I have a lot of .BAK files on my computer. What are those and do I need them?

By: Ken Rodgers

Ken Rodgers — Sat, 05 Jun 2010 18:42:43 +0000

Probably already posted on here, but to change all file extensions in a windows directory. Open a command prompt and change to the desired directory if not already there.

ren *.txt *.html

This would rename all files that end with .txt extension to .html

By: tejas

tejas — Wed, 12 May 2010 11:31:17 +0000

thanks for the Extension Renamer program! It is awesome!

By: Parmjit Singh

Parmjit Singh — Sat, 17 Apr 2010 02:11:29 +0000

This worked for me, thanks a lot!

By: Omer

Omer — Tue, 13 Apr 2010 12:53:03 +0000

Hi,
I have 100,000 files in a directory, all with .tif extension. A % of these should have been .pdf files and are wrongly extended as *.tif at the time of scan. Can anyone think of a way to identify which ones are real .tif files and which ones should be .pdf files without actually opening each one up? If we can identify that systematically, we can use the good knowledge on this blog to rename the incorrect .tif files to .pdf. Thanks in advance!

By: rebeca

rebeca — Sun, 04 Apr 2010 17:42:36 +0000

Thank you so much! This is a wonderful utility! Who knew there was such an easy way to change file extensions on so many files at once!

By: Dave

Dave — Sat, 20 Mar 2010 23:07:26 +0000

Extension Renamer sucks. Don’t download it. It asks you to download an ancient version of the .NET framework(1.4!) in order to run. You gotta be kidding!

By: Fernando

Fernando — Thu, 18 Mar 2010 15:28:23 +0000

I cannot open some pictures on my computer, can you help me?

By: Michal

Michal — Thu, 18 Mar 2010 10:45:06 +0000

Hi, If you are looking for some file extensions, take a peek at file-extensions.org. It is huge file extensions database. Have a nice day:-)

By: Doris

Doris — Tue, 16 Mar 2010 23:11:21 +0000

You can also use the rename DOS command to batch change file extensions, no need for any additional software. Only if you need to batch rename files do you need extra software.

By: harish

harish — Sat, 13 Mar 2010 08:33:13 +0000

thxx a lot………..u solved my problem. 1,000+ file extensions changed in seconds!

By: Carl

Carl — Thu, 04 Mar 2010 18:55:27 +0000

Can someone tell me how to do this using DOS or PowerShell commands? I want to create a script and deploy it to many user PCs on my Windows Server 2008 network.

We have a bunch of files on many computers that need to have their file extensions changed due to a mistake. Can someone help?