Buddy2014 said

1. Does PDF Creator only convert non-PDF files to PDF files (and then merge them) or does it also merge existing PDFs without converting them first?

PDF Creator works like a printer to capture print output to a file. It can receive and combine multiple printouts. However, printing a PDF to PDF probably would be messier than merging them using a better tool.

2. I use WPS Writer to view PDFs but does it also allow me to create and/or merge existing PDFs?

Not familiar with this tool.

3. Does Win 7 have a built-in creator and/or merger and/or viewer?

Possibly a viewer?

I am looking for an installable all-on-one creator, merger, and viewer-Does one exist?

I assume you mean, other than Adobe Acrobat Standard for $300 (or a monthly subscription).

The makers of PDF Creator also offer a viewer/editor called PDF Architect. I don't use it, but I notice the license page says merging is included in the free version: https://www.pdfforge.org/pdfarchitect/personal

Jscher2000:

I think that you misunderstood my question so let's try again.

PDF Creator converts 'non-PDF files' to PDF files (and then has the ability to merge them).

1. Can it merge existing PDFs without converting them first or does it have to convert then merge files?

2. Regarding PDF Architect, there is a watermark on each page so that is not a suitable app.

Buddy2014 said

PDF Creator converts 'non-PDF files' to PDF files (and then has the ability to merge them).

Think of PDFCreator as a printer. You print from an application -- it could be word process, web browser, photo viewer, whatever -- to PDFCreator, it intercepts the print output, and converts it to a PDF. You can send multiple print jobs in a row and ask PDFCreator to combine them into a single PDF (click Merge before you click Save).

This will be easier to understand if you install it and try it.

PDFCreator does not convert existing files, it only works with print output.

I figured it out.

Thanks.