Rename multiple files doubles extension (try #2).

Rather than go thru the Finder's File ➙ Rename menu option try the following:

1 - select the file to rename.

2 - press the Enter key.

3 - enter the text for the file name.

4 - press the Enter key again.

That's all it takes:

t3w wrote:

Why did Finder start repeating extensions for most file Renames, after working fine for a bunch?

Happened on a MacBook Pro 2021 with Sox 13.1 Ventura.

1. Select several or many files, including `ExitingName.pdf` .

2. File menu —> Rename.

3. Choose `Add text` with `before name`, and enter `Toms_` .

4. If get prompt that file extension will be changed to `.Toms_`, cannot exit nor undo (Escape fails too). Regardless of choosing `Keep .Pdf` or not.

4b. Dialog box: ``Are you sure you want to change the extension from “.pdf” to “.Toms”? If you make this change, your document may open in a different application. [ Use .Toms ] [ Keep .pdf ] [ ] Apply to All`` .

5. End up with `Toms_.ExistingName.pdf.pdf` and notice extra dot after prefix you entered.

6. Have to manually rename those individually = time consuming.

Any help appreciated.

+++

P.s. - tried to post this question but Firefox browser hung, so first try might exist. If so, ignore that post and answer this post.

I don't get it...?

what is the reference to #2 no link provided.

Download a PDF? Always keep the .PDF extension in place

Once you down load, make a name change if it suits you better ex. Original.pdf >> New.pdf

If your underscore_ is the issue than avoid it.

Save a document as a PDF on Mac - Apple Support

How much is a bunch. I've tried about 10 and can't replicate the problem.