<Window x:Class="Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="850" Width="1200">
    <Canvas  x:Name="canva" Height="760" Width="1036" >
        <Image  x:Name="img"  Stretch="Uniform"     Margin="15,15,15,15" Source="c:\sertifikat.jpg"  Height="768" Width="1024" Canvas.Left="0" Canvas.Top="0" ></Image>
        <TextBlock  Canvas.Left="327" Canvas.Top="468" Height="42" Name="TextBox1" Width="448" Text="Пупкин Алексей Иванович" FontSize="35" Background="Transparent" />
    </Canvas>
</Window>