FreePDF: Editing text that already exists in the PDF document is not possible with FreePDF. However, you can use the Text Plus tool 
to create your own text boxes in which you can enter and edit text.
If you enter too much text, any text that does not fit into the text box will be hidden.
A small "text overflow square" 
will then appear in the lower right corner of the text box to warn you that certain parts of the text are not visible.
Reshaping the text box
To reveal the hidden text, enlarge the text box by dragging the handles at its edges.
To do so, use the Text edit tool 
or the Object tool 
in the Quick access toolbar.
You can link multiple text boxes so that the text can flow between them. For more information, see the previous section Editing text across columns and pages.
Other ways to prevent text overflow
▪Reduce the size of the text by:
| - changing the font size of the text |
| - changing the line spacing |
| - or changing other spacing such as letter spacing. |