How do I set page size in MS Word?

In Office 2003 or earlier

  • Go to File->Page Setup
  • Click on the tab named "Paper"
  • Choose the desired size from the "Paper Size" drop down. You can specify the size using "Custom Size", if it is not already available.

If you are using Office/Word 2007, "Paper Size" option would be available in the "Page Layout" tab.