In Properties, you need to click on Security.ģ. First, open Adobe Reader DC > File > Properties.Ģ. Yes, the user can follow the steps to know whether the PDF file is secured with some restrictions on it.ġ. Is There any Way to Know PDF File is Protected with Restrictions? When the user gets a shared PDF file then he/she is not able to recognize that highlight not working on PDF as the restrictions are applied to it or not. Most of the people apply restrictions to a PDF file due to security concerns. 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. Therefore, to answer such queries we have described the best software which can be used to enable highlighting in PDF documents. why is highlighter not working in Adobe Reader DC.

However, in many cases, users have the query i.e. Mostly, it is used in PDF reports, ebooks, notes etc. Basically, the Highlighter option is used to highlight the data which is important for the user. In a PDF document when you want to just mark the important content or lines then Highlighter tool is used.

Pdf highlighter for windows