How can I use LINER in iBooks? Hailey December 09, 2021 21:56 Updated Follow We're sorry to tell you that you can't use LINER in iBooks. LINER only supports HTML and PDF format. Related articles How to highlight PDF files? How to highlight on iOS Which platform does LINER support? LINER user guide How to hide a popup box when you're highlighting Comments 0 comments Please sign in to leave a comment.