How do I convert a .tax document to .pdf?

Do you have the 2023 desktop version that produced.

If so you can re-save it as a PDF

1. Open your return in TurboTax.
2. Select File.
3. Select Print/Save for Your Records.
4. Choose to either Save As PDF or Preview Print Copy.

The only way to convert a .tax file to a PDF is with the 2023 desktop TurboTax program.

You don't convert. The .tax2023 file will remain. Open the 2023 Turbtax file. from the File tab select print. a new window should open and at the bottom, there is an option to save it as a PDF.   First, select the forms you want to save.  Then "Save as a PDF" and select where on your computer to save it. if you want a printed copy then instead of saving as a PDF, select "preview print copy" A new window opens and usually at the top right there an icon for a printer select that. Then another window opens with the forms and an option to select the printer.  you can still select a PDF printer or any other printer listed.