As Many paper size standards conventions exist in Microsoft Word, you do not need third-party apps or service to get the job done. You can resize a Word document size in two different ways.

How to Enlarge Pages in Microsoft Word. Microsoft Word's default page size is 8.5 by 11 inches, or "letter size," which is the most common size in American offices. But Word supports several other ...

Scaling a document in Microsoft Word is often necessary when you need to adjust the content to fit a different paper size, whether for printing or other purposes.