Class StampLayer

Controls whether stamps appear above or below existing PDF content. Essential for watermarks, backgrounds, and overlay positioning.

// Watermark behind content (won't obscure text):
var watermark = new TextStamper("CONFIDENTIAL") {
    Layer = StampLayer.BehindExistingPDFContent,
    Opacity = 30
};
pdf.ApplyStamp(watermark);

// Annotation on top (covers content):
var stamp = new HtmlStamper("<div>APPROVED</div>") {
    Layer = StampLayer.OnTopOfExistingPDFContent
};
pdf.ApplyStamp(stamp);

Behind = watermarks, On top = annotations/signatures

See: https://ironpdf.com/how-to/stamping/

Inheritance

System.Object

StampLayer

Namespace: IronPdf.Editing

Assembly: IronPdf.dll

Syntax

public sealed class StampLayer : Enum

Fields

BehindExistingPDFContent

Places stamp behind existing content (watermark effect). Text remains readable, stamp acts as background.

var bgStamp = new ImageStamper("watermark.png") {
    Layer = StampLayer.BehindExistingPDFContent,
    Opacity = 25  // Semi-transparent
};

Declaration

public const StampLayer BehindExistingPDFContent

Field Value

Type	Description
StampLayer

OnTopOfExistingPDFContent

Places stamp on top of existing content (overlay effect). Stamp covers underlying content, use for signatures/annotations.

var signature = new ImageStamper("signature.png") {
    Layer = StampLayer.OnTopOfExistingPDFContent
};

Declaration

public const StampLayer OnTopOfExistingPDFContent

Field Value

Type	Description
StampLayer

value__

Declaration

public int value__

Field Value

Type	Description
System.Int32