The free options for PDF file to DOC conversions are great, but most of them lack of the expected features like keeping the format or serving as a PDF editor.
In the said situation, Google brings us Google Docs, it's a web based file conversion to which you can edit or convert any document from any browser and OS, whether from Windows, Mac OS X, or Linux.
How to convert a PDF file to a DOC file for free with Google Docs.
In order to use this service, of course you need to have a Google Account and a browser.
Step 1. Visit the Google Docs, then login.
Step 2. Upload your file, by clicking the icon right beside Create icon.
Step 3. Select the File and then choose PDF file you wish to convert into DOC.
Step 4. On the screen of the Upload Settings, check all boxes to convert the file, including “Convert text from PDF and image files to Google documents”.
Step 5. After the file opened in Google Docs, you can click the menu of the File in GDocs then select "Download as" followed by "Microsoft Word 97-2003 (.doc)" in order to convert the file to a DOC file.
That's how to convert a PDF file to a Doc file for free with Google Docs.