Open your web browser and search for how to highlight a text in PDF.There are several online PDF editing tools available in the market that gives you an option to highlight your text in the PDF. You can highlight multiple texts in a PDF. That selected text will be highlighted.Once you click on the highlighter icon, select the text that you want to highlight.Open your PDF in Adobe Acrobat DC and click on the Highlighter icon available in the toolbar.Highlight Text in PDF using Adobe Acrobat DC Now we will discuss highlighting texts in PDF. From students who are studying through a PDF to a business person or employee who is working with PDF, it is important to know to highlight that part of PDF that they want to review again or focus more on studies. Highlighting is basically done to focus on the important part of the text.