Portable Document Format (PDF) files may be opened and used by anyone with a PDF reading program, such as Adobe Reader 9. While few PDF editing features are available in Reader, you can fill out forms as well as add text to PDF files using the Typewriter Tool. The Typewriter Tool will allow you to add text to any area of a PDF by following a few steps.
Click the "Tools" menu, highlight the "Typewriter" option and select "Show Typewriter Toolbar." This action will launch the "Typewriter" button on the main toolbar.
Click the "Typewriter" button. Click once in an area of the document that you want to add text to. Begin typing the desired text. To go to a new line, press the Enter key.
Edit the text properties. Highlight a section of text that you want to adjust. To increase or decrease the size of the text or line spacing, click the appropriate "Increase" or "Decrease" buttons on the Typewriter toolbar, as necessary.