Underline and Strike-Through: With the Drawboard app, you can also underline the important lines to make them prominent or strike through the text if you want to show that it's not important.Moreover, the eraser can help you remove irrelevant paragraphs from the PDF. Make Different Shapes: The user can also make rectangles, clouds, and polygons on the document. In this part, we will learn about the step-by-step procedure involved in using the Drawboard PDF free to markup PDF: Part 3: How to Use Drawboard PDF to Markup PDF With these interesting shapes, you can highlight and make the PDF prominent. Step 1: Download the Drawboard PDF on your system. When the software is downloaded, you don't have to create an account. Click on 'I will do it later,' and then tap on 'Open from device.'