How to convert Autocad 2012 to pdf?

use software called (pdf convert) it is so easy...there are many other soft 

To convert the file from  Dwg to pdf go to print option and select Dwg to Pdf .

the second option is just install the Acrobat professional.

1. Open AutoCAD and click on the Autocad logo button then Open (or press Ctrl+O), browse for the dwg file you want to convert to PDF and click Open
2. You can print to PDF either from the Model view (your working area) or by using a predefined Layout. Click on the Autocad logo then Print (or press Ctrl+P) and configure your printing options:a. In the Plot Area select what you want to convert : Display, Window, Layout or Extentsb. Choose your paper type from the Paper size dropdown list and in the Plot Scale section select the scale of the printed drawing from the dropdown list
3. From the Printer/plotter section select novaPDF
4. Before converting the dwg file you can customize AutoCAD’s printing settings from the Properties button. To customize novaPDF’s printing settings, click on Properties->Custom Printing options from the Plotwindow
5. Click on OK and choose a location where you want the PDF file saved

use the option to export to PDF

go to "plot" - then select printer "DWG to PDF" then select what to plot..-- click "OK"

Jus simply select appropriate PDF plotter in printer name field while plotting and you are done. I am using NITRO PDF for the same.

I would Click on the File menu and select Plot from the drop down menu, with in the plot window click on printer option and select Plot to PDF options, then use either window,limits or extents to Plot. Your drawing will be plotted as a PDF...... 

Install PDF printer and select that printer while printing in AutoCAD

it is easy to make that .

first

1- file ---> plooter manger ----> Add-A-Plotter Wizard >>> then shoose add PDF and setup this options 

second 

1- print order ( ctrl + P ) 

2- Shoose paper size and all layout preparing ,

3- shoosePDF printer from printer name 

enjoy

Export >>>>>>>>>>>> PDF

but before exportation select layout

Go to "plot" - then select printer "DWG to PDF" then select what to plot..-- click "OK"