Adjust text size for emphasis and readability. Select text and apply different sizes. Supports pt, px, em, and rem units with automatic min/max clamping.

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OOXML Structure

<w:r>
  <w:rPr>
    <w:sz w:val="28"/> <!-- Half-points: 14pt = 28 -->
  </w:rPr>
  <w:t>14pt text</w:t>
</w:r>

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Why you’d use this

  • Visual hierarchy - Different sizes for headers, body, and footnotes
  • Emphasis - Larger text draws attention without bold
  • Readability - Adjust size for screen distance and user preference
  • Professional documents - Match specific formatting requirements

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Options

Configure the extension behavior:
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types
Array.<string>
default:"['textStyle', 'tableCell']"
Node/mark types to add font size support to
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defaults
FontSizeDefaults
Default size configuration
Usage: 
FontSize.configure({
  resizable: false,
  cellMinWidth: 50
})

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Attributes

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fontSize
FontSizeValue
Font size with unit

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Commands

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setFontSize

Set font size
Automatically clamps to min/max values
// Set to 14pt
setFontSize('14pt')

// Set to 18px
setFontSize('18px')

// Set without unit (uses default)
setFontSize(16)
Parameters:
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fontSize
FontSizeValue
required
See FontSizeValue type definition

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unsetFontSize

Remove font size
Reverts to default document size
unsetFontSize()

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Types

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FontSizeDefaults

Font size configuration

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FontSizeValue

Size with optional unit (e.g., ‘12pt’, ‘16px’, 14)