Mirror margins cannot be set inWord Online.
However, if you view a document with mirror margins in Word Online, the mirror margins are preserved.
To apply a predefined margin, selectLayout>Marginsand choose the predefined margin you want to use.

In Word Online, Word 2010 and Word 2007, the Layout tab is labeled as Page Layout.
The steps to change margins remain the same.
Before you begin, display the ruler.

If the ruler is not displayed above your document, selectViewand place a checkmark next toRulerto display the ruler.
Youll also need to work in Print view.
SelectView>Print Layoutto display the document in print view.

The ruler is not available in Word Online.
This gutter margin ensures the binding doesn’t interfere with the white space around the text.
To add a gutter margin, selectLayout>Margins>Custom Marginsand key in a width in theGutterbox.

You cannot create gutter margins in Word Online.
Switch to the desktop version of Word to set gutter margins.
These mirror margins ensure the right and left pages are mirror images of each other.
To create mirror margins, selectLayout>Marginsand selectMirrored.
This feature is not available in Word Online.
These boundary lines appear as dotted lines.
The margin boundaries cannot be viewed in Word Online.
To view the page margins: