Nowadays, many people prefer those Mac OS for the convenience and security of its properties. So for the old question how to convert pdf to word doc should widen its way out. As there still are large amount of people install windows series operating system, here we will introduce some easy tools to convert pdf to word for free both for Mac and Windows.

Part one: For Mac OS—Using Apple's built-in "Automator" scripting application to convert pdf to word doc
Step 1: In an open Finder window -> Applications -> Double-click Automator application -> Custom -> Choose to begin constructing your Automator PDF-to-text application.
Step 2: In Automator -> PDFs -> double-click Extract PDF Text -> Rich Text -> Save File to File -> Save as Dialogue -> File Format -> Appliation -> Save Quit Automator.
Step 3: Click the PDF file which you need to use in Word then drag the file in PDF-to-text application that you just created. Release the mouse and the PDF-to-text application will automatically convert the PDF file to a Rich Text file.
Step 4: To open the file in Word or any other word processing application, click and select the new Rich Text file created by the PDF-to-text application; then drag the file on your Word application icon. Release the mouse and the text file will open in Word, with its text formatting intact.
This is an app you could create by yourself convert pdf to word for free on Mac.
Part two: For Windows OS—two ways to convert pdf to word doc
Method 1: Use Adobe Acrobat Professional
All you need is to install Adobe Acrobat professional and then use a virtual printer to save pdf to word doc. It is easy, but to install an Adobe Acrobat professional and converting a large size PDF is too time-consuming. So that is way we need to know some more easy program to adopt and the following way is a good choice for you.
Method 2: Use Tweak PDF to Word
Tweak PDF to Word is a stable pdf to word conversion tool which you could use at ease. It will help you convert PDF to fully-editable MS Office Word documents (*.doc, *.rtf). With its batch and partial conversion features, you can enjoy fast and accurate PDF to Word conversion. Moreover, the original layouts of text, tables, images, graphics, images, hyperlinks, etc. are kept well in the Word document converted form PDF. It is also compatible with Windows 7/Vista/XP/2003/2000.
How to use this Tweak PDF to Word? Only four steps would do it in a few seconds!
Step 1: Download and install Tweak PDF to Word, launch it
Step 2: Import the PDF you need to convert to word doc
Step 3: Choose the path where you want to save the files
Step 4: Click Convert and task will be done in a few minutes
For more information about how to convert pdf to word doc, please have a check here http://www.tweakpdf.com/pdf-to-word.html