Show or Hide PDF Layers in C#

When creating a PDF layer, Spire.PDF allows developers to set an initial visibility state for the layer. While it also supports to change the visibility of existing layers in a PDF document. This article explains how to show or hide the existing layers using Spire.PDF.

PdfLayer.Visibility property is used to change the visibility of a PDF layer. To show a hidden layer, set the PdfLayer.Visibility property to PdfVisibility.On. To hide an existing layer, set the PdfLayer.Visibility to PdfVisibility.Off.

The following example shows how to hide a specific PDF layers:

using (PdfDocument doc = new PdfDocument("AddLayers.pdf"))
{
    //Hide the layer by index
    doc.Layers[1].Visibility = PdfVisibility.Off;

    //Hide the layer by Name
    //doc.Layers["BlueLine"].Visibility = PdfVisibility.Off;

    //Save the file
    doc.SaveToFile("HideLayer.pdf");
}

To show or hide all of the layers:

using (PdfDocument doc = new PdfDocument("AddLayers.pdf"))
{
    for (int i = 0; i < doc.Layers.Count; i++)
    {
        //Show all of the layers 
        //doc.Layers[i].Visibility = PdfVisibility.On;
        
        //Hide all of the layers
        doc.Layers[i].Visibility = PdfVisibility.Off;
    }
    //Save the file
    doc.SaveToFile("HideAllLayers.pdf");
}

Screeshot of the sample PDF document:

Show or Hide PDF Layers in C#

Screenshot after hiding all of the layers:

Show or Hide PDF Layers in C#