Crocodoc is a simple service that allows users to quickly share and edit PDFs, Word documents, and PowerPoint files. Using Crocodoc does not require you to register for an account. To use Crocodoc just upload your file, select your marking tool, and get to work. Crocodoc provides a unique url for every file you upload. Share that url with the people you want to have comment on your document or PowerPoint slides. Crocodoc doesn’t have nearly the number of editing options that you would find in Google Docs or Zoho Writer, but Crocodoc does have the advantage in simplicity as it doesn’t require users to have accounts in order to collaborate.