How can I use LINER in iBooks? Hailey April 14, 2022 05:06 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? Which platform does LINER support? How to highlight on iOS LINER user guide [Aug 5th] Updates - Highlight even on Youtube Comments 0 comments Please sign in to leave a comment.