PDFZen!

Cloud-based PDF viewer and annotation tool for your browser. Perfect for Chromebook 1:1 schools. View, export, print and share your PDF files straight from your browser. Kami works on all browsers and works best with Google Chrome.

Online site for viewing, annotating and collaborating on PDF and Office documents. Upload a document, send a link to invite feedback. Runs entirely in browser - does not require any plugins. Free version allows uploading a few documents a month - pay-as-you-go options if you need extra storage.