You can quickly add page numbers to your document in Word Online, but you can’t choose the starting value.
If you’re familiar with the desktop version of Word, you might know that you can format the page numbers so they start with a certain value. For example, if the document you’re working on picks up where another left off, you might want the first page to show as, for example, “Page 210.” Word Online preserves this formatting when it’s already in your document, but it doesn’t yet provide a way to add the formatting.
If you have the desktop version of Word, you can add custom formatting of page numbers like this, and Word Online preserves that formatting. To make changes to your document in the desktop app, click Open in Word, and then format the page numbers.
When you’re done and you've saved the document, it will continue to store the formatting when you open it in Word Online.
To learn more, see Start page numbers with something other than 1 or Start page numbers with something other than 1 in Word 2016 for Mac. If you don’t have Word, you can try or buy it in the latest version of Office now.
Tip: Word Online works seamlessly with Word and other Office desktop programs, and we update it based on input like yours. For the latest feature announcements, visit the Office Online blog.