Similarly, if the person is having a file with PDF restrictions implemented on it then he/she finds that the highlighter not working in Adobe Reader or it gets greyed out. When restrictions are applied to any PDF document then the user is not able to use certain functions or tools. Please suggest me a simple and reliable way to enable highlight text tool in PDF document.” Why Highlight Option is Disabled in PDF Document? I need to share the biology notes to my friends as soon as possible with highlighted points in PDF. I am not able to figure out why highlight option is disabled in PDF. But unfortunately, I was not able to use Highlighter option in Adobe as it was greyed out.
Now, I need to highlight the important lines in the notes and share the PDF with my friends too. “My Biology professor gave notes to me in PDF format.
