Crocodoc takes your PDFs, Word documents, and PowerPoint presentations, and lets you view and mark them up online. Documents can be shared with others, who can collaboratively highlight or strikeout text, add notes and comments, and make revisions.

Crocodoc’s synchronized video feature keeps all the editors and collaborators perfectly synched in real-time. You can draw directly on the images, leave post-it like comments, and easily access the automated project tracking to stay up-to-date on changes and communications.

Crocodoc uses HTML5 and CSS3 to alleviate the need for Flash and 3rd party plug-ins, improving the experience for end-users and making it possible to seamlessly embed Crocodoc into 3rd party applications via its API.

Crocodoc lets you upload a PDF, and a few seconds later you get a version of the same document in your browser, which you can then share with coworkers and annotate with notes, highlighting, text, and a pen tool, with changes that show up to other users in real-time.