How to Fix Incorrect Mirror Margins and Odd-Even Pages in Word
Question details
Users need to resolve an issue where Word applies mirror margins incorrectly, placing the wider gutter margin on the wrong side and disrupting the document's page numbering.

- Product
- Microsoft Word
- Device & OS
- not provided
- Scenario
- Formatting a document for book binding or double-sided printing, which requires left and right margins to alternate correctly on odd and even pages.
- Observed behavior
- Mirror margins align to the wrong side of the page due to incorrect section start settings, and attempting to fix it causes the page count to increase or page numbering to skip.
Enable formatting marks by clicking the 'Show/Hide ¶' button on the Home tab so you can easily spot hidden section breaks and page breaks causing the layout issues.
Configure the Section Start to an Odd Page
Ensure the first section of your document is properly configured to start on an odd page, which naturally aligns right-hand pages correctly in mirrored layouts.
Mirror margins rely heavily on odd and even page designations. In book printing, the first page (usually the title or first chapter page) is always a right-hand page, which means it must be an odd page. If your section is accidentally set to start on an 'Even page', the inner and outer margins will be reversed.
Place your cursor on the first page of your document. Navigate to the 'Layout' tab on the ribbon and click the small dialog box launcher arrow in the bottom-right corner of the 'Page Setup' group.
In the Page Setup dialog, click on the 'Layout' tab at the top.
Locate the 'Section start' dropdown menu and change it to 'Odd page'. Ensure 'Apply to' is set to 'Whole document' or 'This section' depending on your document structure, then click 'OK'.

Fix Page Numbering and Remove Conflicting Section Breaks
Resolve skipped numbers or inflated page counts by adjusting page number formatting and removing unnecessary section breaks.
Easily Set Up Book Margins with WPS Writer
WPS Writer offers a highly intuitive Page Setup interface, making it simple to configure mirror margins, gutters, and odd/even page headers without unexpected numbering issues.
- 1. Open your document in WPS Writer: Launch WPS Office and open your text document.
- 2. Access Page Layout: Navigate to the 'Page Layout' tab on the top ribbon and click on 'Margins', then select 'Custom Margins'.
- 3. Enable Mirror Margins: In the Page Setup dialog under the 'Margins' tab, find the 'Pages' section and select 'Mirror margins' from the 'Multiple pages' dropdown.
- 4. Set Section Start: Switch to the 'Layout' tab within the same dialog, set the 'Section start' to 'Odd page', and click 'OK' to apply perfectly aligned margins.

Frequently Asked Questions
Why is my wider gutter margin on the outside instead of the inside?
This happens when a right-hand page is mistakenly formatted as an even page. Because the gutter is designed to be on the binding side (left side for odd pages, right side for even pages), setting the first page as an 'Even page' reverses the entire layout. Changing the Section Start to 'Odd page' will fix this.
Why does Word skip a page number when I use mirror margins?
If you force an odd page to immediately follow another odd page (or even to even), Word automatically inserts an invisible blank page to maintain the correct left/right physical book layout. This causes the page numbering to seemingly skip a number.
How do I apply mirror margins to only one part of my document?
You can achieve this by inserting a Section Break before and after the text you want to format. Highlight the text, open the Page Setup dialog, apply 'Mirror margins', and ensure the 'Apply to' dropdown is set to 'Selected text' or 'This section'.
Why does my page count increase when fixing the margins?
When you correct the odd/even page alignment, Word may automatically insert necessary blank pages to ensure chapters or new sections start on the correct side of the spine. These blank pages add to your total page count.




