Scale the text using a ScaleTransform
<Window x:Class="SDKSample.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Text Transform Samples"
Background="FloralWhite"
Height="640">
<StackPanel>
<TextBlock FontSize="32" FontWeight="Bold" Foreground="SteelBlue" Text="asdf" Margin="100, 0, 0, 0">
<TextBlock.RenderTransform>
<ScaleTransform ScaleX="1.5" ScaleY="1.0" />
</TextBlock.RenderTransform>
</TextBlock>
<TextBlock FontSize="32" FontWeight="Bold" Foreground="SteelBlue"
Text="{Binding Path=Text, ElementName=textblockScaleMaster}"
Margin="100, 0, 0, 0">
<TextBlock.RenderTransform>
<ScaleTransform ScaleX="1.0" ScaleY="1.5" />
</TextBlock.RenderTransform>
</TextBlock>
</StackPanel>
</Window>
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