FreePDF: The Grid and Guides feature is not included in FreePDF.
Guides simplify the layout and positioning of objects on the page. You can insert any number of horizontal and vertical guides in a PDF.
Objects snap to a guide when moved near it. This simplifies the alignment of objects.
Horizontal guides
To create a horizontal guide, first make sure that the ruler is visible (ribbon tab View | group View | Rulers). Then click on the horizontal ruler at the top of the program window, and drag it down to the desired position. FlexiPDF will then insert a horizontal guide at this point.
Vertical guides
To create a vertical guide, first make sure that the ruler is visible (ribbon tab View | group View | Rulers). Then click on the vertical ruler on the left edge of the program window, and drag it to the right to the desired position. FlexiPDF then inserts a vertical guide at this point.
Notes
▪If you have enabled the option Store layout info in PDF (see Options: Saving tab), guides will be saved in the PDF and will be available again after saving and reopening.
▪Once guides have been created, you can use the Object tool 
to move and delete them like normal objects.
▪To temporarily hide all guides (or to prevent them from being printed), use the ribbon command View | group View | Grid and guides 
| Hide Guides to toggle the display of the guides. Alternatively, press the shortcut key Alt+; to switch between showing/hiding the existing guides.