Here’s another, sometimes easier, way. Open the Doc file in TextEdit and then choose File -> Save As and choose HTML from the File Format pop-up.
That having been said, take note that TextEdit reads many but not all Word Docs and that details often get lost in the mix. On the up side though, I feel a lot safer opening Word attachments in TextEdit than I do in Word.
jpkang writes: I think Derrick’s point was that the HTML that Google produces is much cleaner/readable than the standards-compliant HTML that most text editors produce nowadays (with tons of CSS tags).
TextEdit rocks at this. Open TextEdit -> Preferences. Choose “Open and Save”. Set the Document Type and Styling. (I prefer to pick No CSS from the styling pop-up, XHTML 1.0 Strict from the Document Type popup, and Western (Mac OS Roman) from the Encoding pop-up.) Close the Preferences pane.