Crocodoc is a real-time collaborative comment and markup tool. With Crocodoc, students can upload any PDF, Word document, PowerPoint presentation, image, or web page and draw and comment on it using tools for highlighting, sticky notes, strikethrough and text. Multiple students can work on the same file and see each other’s comments pop up in real time, so it is great for group activities including peer review or image/photo analysis. Crocodoc is free, straightforward and no sign up is required. 

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