Which file types can I upload?

You can upload Word (.docx, .doc), PDF (.pdf), PowerPoint (.pptx, .ppt), OpenDocument (.odt), Rich Text (.rtf), plain text (.txt), LaTeX (.tex), and Markdown or AsciiDoc (.md, .adoc, .asciidoc).

What you get back depends on the format. Word, OpenDocument, RTF, Markdown, and AsciiDoc documents come back as a tracked-changes copy plus a clean copy. PDFs come back as one annotated PDF, since we cannot make direct edits to a PDF. PowerPoint files come back as one clean, edited copy.