Portable document format (or PDF) is a universal document format that allows creators of PDFs to add emphasis to certain sections of a document by highlighting the text in Adobe Acrobat. Readers of the documents can add and remove highlighted text from a document if the creator has enabled commenting in Adobe Reader.
Click "Start," "All Programs" and then "Adobe Acrobat/Reader."
Click "File" and then "Open" from the top menu. Click the PDF document of choice and then click the "Open" button.
Click and then drag the mouse cursor over the text you wish to remove the highlighting from.
Click "Tools" from the top menu and then click the "Highlight Text" tool. The highlight text tool looks like a "T" with a marker. The highlight is removed from the text.
Repeat steps 3 and 4 to remove highlighting from additional text in the Adobe document.