Built with educational users in mind, Revizr allows content creators - students and teachers - to upload documents for collaboration without losing editorial control. Invited collaborators offer suggestions for changes; the suggestions appear as hand-drawn markup. Those who do have control decide whether or not to use the suggestions. The site has special support for footnotes and similar features. It can be used as a tool for grading papers, peer review, or with research papers that deserve teacher/peer attention several times in the writing process.