1using IronPdf;
2using IronPdf.Editing;
3using IronPdf.Rendering;
4using IronSoftware.Drawing;
5
6using var pdf = PdfDocument.FromFile(@"stamper-watermark-sample.pdf");
7
8var stamper = new TextStamper(@"CONFIDENTIAL", 10000)
9{
10    HorizontalAlignment = HorizontalAlignment.Center,
11    VerticalAlignment = VerticalAlignment.Middle,
12    HorizontalOffset = new Length(0, MeasurementUnit.Percentage),
13    VerticalOffset = new Length(0, MeasurementUnit.Percentage),
14    Opacity = 35,
15    Rotation = -45,
16    Scale = 100,
17    IsStampBehindContent = false,
18    IsStampAnnotation = false,
19    FontFamily = @"Arial",
20    FontSize = 60,
21    Color = Color.FromArgb(224, 26, 89),
22    BackgroundColor = Color.Transparent,
23    IsBold = true,
24    IsItalic = false,
25    IsUnderline = false,
26    IsStrikethrough = false,
27    UseGoogleFont = false,
28};
29
30pdf.ApplyStamp(stamper);
31
32pdf.SaveAs(@"stamper-watermark-text.pdf");