Word makes it easy to convert your doc to a PDF or HTML file. When you "save as" a file, you'll see a "Save as type" pull-down menu, which will provide a bevy of options including PDF and Web Page.
Note that the Web Page function can include a lot of extra code. This won't necessarily affect the page, but can make things a little messy if you need to change anything.
Another option is to use a free conversion site like Word to Clean HTML, which—as the name implies—will create HTML code from text that is directly copied and pasted from a Word doc.