Question to PDF file

> when editing the PDF file, how to remove the existing text inside?

That depends on what product you're using to do the editing. For example, in Adobe Acrobat XI Pro, the steps are:

Tools
Content Editing
Edit Text & Images
Then highlight text and delete it or use the Delete or Backspace keys

Another example is Nuance Power PDF. The steps in that are:

Edit
Edit Object
Then highlight text and delete it or use the Delete or Backspace keys

Many products can edit PDF files. What software are you using to edit them?

> BTW, is there any other way to convert PDF to Word, and vice versa, other than subscribing to Acrobat?

Yes, lots of products can do it besides Acrobat.

For Word to PDF, there are many free PDF print drivers out there. Eight good ones are Bullzip, CutePDF Writer, doPDF, Foxit Reader PDF Printer (part of the Foxit Reader install), Nitro PDF Creator (part of the Nitro Reader install), PDFCreator, PDF-XChange Printer (part of the PDF-XChange Editor install), and PrimoPDF:

http://www.bullzip.com/products/pdf/info.php
http://www.cutepdf.com/Products/CutePDF/writer.asp
http://www.dopdf.com
http://www.foxitsoftware.com/Secure_PDF_Reader
http://www.nitroreader.com
http://www.pdfforge.org/pdfcreator
http://www.tracker-software.com/product/pdf-xchange-editor
http://www.primopdf.com

They have varying features and some folks prefer one over the other, so you may want to experiment to see which one you like the best. At one time CutePDF was my favorite, then it was doPDF, and my current choice is Bullzip. So I suggest trying Bullzip first to see if it works well for you; if not, try doPDF next; then the others until you find one that you like. All of them install a "printer" so that you can "print" to it from any Windows program (including, of course, Word). When you "print" to it, the print driver will create a PDF file.

For PDF to Word, I've had good (not perfect) results with this free online tool:
http://www.pdftoword.com/

If you prefer a local install, I've also had good (also not perfect) results with this free tool:
http://www.boxoft.com/pdf-to-word/

You may get better results with non-free products. I've gotten better (but still not perfect) results with Nuance's Power PDF (comes in both Standard and Advanced editions):
http://www.nuance.com/for-business/document-imaging-and-scanning/power-pdf-converter/index.htm

There's a free trial for the Advanced edition (but not Standard) so you can see how well it works for you before buying it:
http://www.nuance.com/for-business/document-imaging-and-scanning/power-pdf-converter/index.htm#resources

Another good (non-free) product is Able2Extract PDF Converter:
http://www.investintech.com/prod_downloadsa2e.htm

It also offers a free trial.

The first link in this section is to the (free) Nitro cloud. Nitro is a well-known name in PDF tools and their Nitro Pro has a PDF to Word feature:
http://www.nitropdf.com/pro/features/convert-export

There's also a free trial for this, but I've never used it, so can't vouch for its performance. However, it uses the same engine as the online tool, which I have used and is very good, so I would expect the same of Nitro Pro.

One more non-free product (but reasonably priced at $39) is CAD-KAS's PDF to Word:
http://www.cadkas.com/downengpdf9.php

I haven't used this product, but I have used their PDF Editor Objects, which is excellent. Based on the quality of PDF Editor Objects, I think that their PDF to Word is worth a try, and there's a free trial:
http://www.cadkas.com/pdf2word!.exe

I've been on previous threads here at EE where other experts have recommended these three (free) online tools:

http://www.convertpdftoword.org
http://www.pdfonline.com/pdf-to-word-converter
http://www.wondershare.net/pdf-converter/pdf-to-word-converter.html

I can't personally vouch for these, but based on the positive comments from other members, I'm passing them along for your consideration.

No matter which way you go, keep in mind that PDF-to-Word conversion is tricky business – maintaining the formatting/layout is tough stuff! I haven't found anything that is perfect, and results vary from one document to the next. So my suggestion is to put some, or all, of these products on your short list for evaluation. Define a few test docs – your docs! Compare the resulting Word files to see which, if any, of the tools produces Word files that are satisfactory.

> How to edit the text of the PDF file, within Word 2013?

You don't actually edit the PDF file. Word converts the PDF to Word format and then you edit it as you would any other Word document.

> After having edited the file, can we save it as PDF file?

Yes, Word 2013 can do a Save As to PDF. Regards, Joe