Infix Pro PDF Editor can align text inside a text box so that it sits at the top, middle or bottom of a text box. 

It can also make text automatically fit its text box by altering various aspects of the text formatting.

  1. Select the Text tool (Text tool button) from the tool bar.
  2. Click in the text box you wish to edit.
  3. Choose an alignment from Text->Alignment->Top / Middle / Bottom
Notes
  • Alignment reverts to "Top" for linked text boxes.