

(b) Secured or protected document: The security settings of the PDF document clearly restrict you to add the comment on PDF document. (a) A Scanned PDF document containing no real text: When Adobe acrobat highlight tool is not working, then it is possible that your PDF file is likely a scanned file that containing no any real text. Some of the most common cases are discussed below: There are many situations where users are unable to use highlight text in PDF or add comments on it. Does anyone know how to enable highlight option in Adobe Reader?” Why Users Can’t Highlight PDF in Adobe Reader? It does not give me permissions to highlight text in PDF files. But, I have found that the Adobe Acrobat highlight tool not working.

I want to highlight some important lines in it. “I am reviewing a magazine that is downloaded in PDF file format.
