w:mirrorIndents (Mirror Indents)

Swaps the left and right indents on even-numbered pages so that inside/outside margins mirror each other on double-sided documents.

Parent elements

w:pPr

Description

w:mirrorIndents is a toggle property that, when active, causes the w:left and w:right indent values to be swapped on even-numbered pages. This mirrors the indent pattern for double-sided (duplex) printing, ensuring that the “inner” margin is consistent regardless of whether a page is odd or even.

It is defined in ECMA-376 Part 1 §17.3.1.18.

Attributes

Attribute	Type	Possible Values	Description
`w:val`	`ST_OnOff`	`true`, `false`, `1`, `0`, `on`, `off`	Enables indent mirroring on even pages. Omit to inherit.

Examples

<!-- Paragraph with mirrored indents for duplex printing -->
<w:p>
  <w:pPr>
    <w:ind w:left="720" w:right="360"/>
    <w:mirrorIndents/>
  </w:pPr>
  <w:r><w:t>This indent mirrors on even pages.</w:t></w:r>
</w:p>

using DocumentFormat.OpenXml.Wordprocessing;

var para = new Paragraph(
    new ParagraphProperties(
        new Indentation { Left = "720", Right = "360" },
        new MirrorIndents()
    ),
    new Run(new Text("This indent mirrors on even pages."))
);

Notes

Complementary to the document-level w:mirrorMargins setting in w:settings, which mirrors page margins rather than paragraph indents.
On odd pages the w:left/w:right indents apply as declared; on even pages they are swapped.