Highlighter won't work on Adobe Reader

There are different types of PDF forms out there. Some are based on regular PDFs and can be modified with Acrobat to have fields and buttons. Those forms (AcroForms) allow annotations and comments. Then there are forms created with LiveCycle Designer or AEM Form Designer. Those are internally completely different to regular PDFs, can be very flexible in layout and function (XFA forms) but won't allow annotations nor comments.

Check the file properties of you PDF with [Ctrl]+[D]. There you can see, which application was used to create the form, which might help to identify the kind of form.

MOVED TO THE ACROBAT READER FORUM

Hi there

We are sorry to hear that.

What happens when you try to annotate the PDF file? Do you get any error message? If yes, please share the screenshot of the same for a better understanding.

Is this an issue with one PDF file or with all the PDFs? Please try with a different PDF file and check. If the file is stored on a shared network/drive, please download it to your computer locally and then try again.

Also, check for any restrictions on the PDF file which is refraining you from annotating the file. open the PDF > go to File tab > Properties > Under Security tab check for document restriction summary and see if that helps.

Also, make sure you have the recent version of the application installed. Go to Help > Check for updates and reboot the computer once.

Also try to repair the installation from the help menu (Win Only) and check.

Please try to reset the Acrobat preferences as described here https://community.adobe.com/t5/acrobat-discussions/how-to-reset-acrobat-preference-settings-to-default/td-p/4792082

Regards

Amal