I made a simple file renamer for renaming files in batches.

JakobAir · Feb 2, 2025

Well, I asked Gemini to make it. I'm not sure how helpful this is, but it can save time instead of manually doing it if you're doing a lot of files. It doesn't convert anything, just renames the extension. There is a version that can be dropped into the folder where the files are to be changed. This is for ease of use. The other version is for the user to specify the path so it can be left in one place without moving it all over.

https://github.com/JakobAir/extension-renamer

Scarlet · Feb 2, 2025

Not to disregard your efforts, but there’s already a very good tool for this:

https://www.bulkrenameutility.co.uk/

It’s like the first thing I install on any new PC lol

JakobAir · Feb 2, 2025

Scarlet said:
Not to disregard your efforts, but there’s already a very good tool for this:

https://www.bulkrenameutility.co.uk/

It’s like the first thing I install on any new PC lol

No worries! Thanks for the heads up. I did this for anyone that doesn't want to install anything else. It's pretty niche I guess.

JuanMena · Feb 2, 2025

Like... on Windows:
Ctrl+E -> Rename?

Edit: The extension?
That's a new one for me.

JakobAir · Feb 2, 2025

JuanMena said:
Like... on Windows:
Ctrl+E -> Rename?

Edit: The extension?
That's a new one for me.

Control + E brings up search.

Yeah the extension of the file, like .txt, .vhd, or .wtf.

CMDreamer · Feb 2, 2025

I use Advanced Renamer, works like a charm and also supports RegExp.

Before it, I've also used Metamorphosè 2, which hasn't been updated in a while.

RalfKin · May 13, 2026

If you ever need to go beyond extension swaps, I’ve had a smooth time using renamer.io for bigger batches. I’ve used it to add prefixes, fix casing, and clean up messy folders with live previews so I don’t mess anything up. It still runs everything locally, so nothing gets uploaded, and it’s quick for those days when you’re drowning in files.

zxr750j · May 13, 2026

So I am old and don't like to download random tools, so if you're like me and you do this sporadically:

Right-click the folder in Explorer and choose "Open in Terminal".
If the terminal opens in PowerShell, type: cmd /c ren *.old *.new and hit Enter.
If you are using an old-style Command Prompt (CMD), then just ren *.old *.new should do it.

If you want to keep the original files (make a copy instead of renaming):

In PowerShell, type: cmd /c copy *.old *.new
In Command Prompt, type: copy *.old *.new

If you do this often: Use a before-mentioned tool!

I made a simple file renamer for renaming files in batches.

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