How do I convert a PostScript file into a PDF?

From what I can tell, a PS postscript file out of InDesign to Distiller to PDF is different from a PDF exported directly from InDesign ... seems to contain more file information, bigger.. don't know if it looks better in the end.

Hi

As others have said, the best method is File > Export to PDF (Print) from InDesign. 

Way back 20 or 25 years ago when we used to choose File > Print > Print to File in PageMaker and create a .prn file, we then changed the extension to .ps and opened it in the Distiller after choosing the correct settings. That workflow is archaic, but the Distiller still comes with Acrobat as a separate package. 

If you have the InDesign file, you should export directly to PDF and Print to booklet from Acrobat. You could also print to booklet from InDesign, but most users print from Acrobat. If you only have the postscript file, the Distiller App is located in the same folder as Acrobat DC (on a Mac), it's probably the same on a Windows machine. You could also try changing the file extension to .eps and try opening it in Acrobat. Here is a link to a related topic:

https://community.adobe.com/t5/acrobat/booklet-and-bleed/m-p/9737476

You can run the ps file through distiller or see if InDesign can Export or Save As a PDF.

My installations of Acrobat DC Professional all have distiller. Reader does not have Distiller.