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 PDFill PDF Layer:

(See Example PDF and Example PDFill Project File  )

PDF Layer is a feature which allows some content to be made visible or invisible in the PDF. Its uses include PDF overlays, having alternate languages appear and adding details to diagrams. PDFill PDF Editor can allow the added PDFill objects visible or invisible in the PDF Document.

The concept of PDF Layers came with the introduction of PDF version 1.5. PDF Layer is more formally known as Optional Content Groups (OCG) that provides an excellent method for dealing with related content.  PDF Layer is a dictionary representing a collection of graphics that can be made visible or invisible dynamically by users of viewer applications. 

The concept of Layers isn't new, Illustration and CAD packages have been using Layers to separate content for many years. Now, PDFill PDF Editor provides this functionality when new information is filled into the PDF document.

Note: The current version of PDFill can only add new layers and it cannot edit the existing layers.

STEP 1. Choose View Menu > PDF Layers

or click the PDF Layer  Button in the View Toolbar.

STEP 2. The Layer Toolbar will show on the left of PDFill Window. Click Button "New" to have the new Layer's Properties Dialog.

STEP 3. Set the option for the Layer's Properties:

New Layer After Create a sibling layer item after the selected item.
New Layer Under Create a child layer item under the selected item.
Layer Name The title of the layer.
Group Title Only If checked, it is just a group name that holds some layer items.
Show Layer Sets the initial visibility of the layer.
On Panel Sets the visibility of the layer in Acrobat's Layer Panel.
If off, you can not see this layer inside Adobe Reader's Layer Panel.
Locked Lock its property so that it can not be changed inside Adobe Reader.
Initial State: Visibility Indicates that the group should be set to that state when the document is opened in a viewer application.
Initial State: Print Specifies that the content in this group is intended for use in printing
Initial State: Export Specifies the recommended state for content in this group when the document (or part of it) is saved by a viewer application to a format that does not support optional content (for example, an earlier version of PDF or a raster image format).
Set Zoom Factor Specifies a range of magnifications at which the content in this optional content group is best viewed.
Belong to a Radio Button Group If you want one layer in a group to be unchecked as another layer is checked, you should use the same name (text string) for these layers.
Default Layer:  
Clear Current default layer Clear the current default layer. The new created PDFill objects will not put under a layer.
Set this layer as future default layer Set this selected layer as the default layer so that the new PDFill objects is put under this layer.

STEP 4:  Right-click a layer to Add, Edit or Delete a layer:

Show or Hide Layer Show or hide this sleeted layer.
New Layer After or Under Create a new layer after or under this selected layer.
Rename This Layer Change the name of this selected layer.
Delete This Layer and Under Delete this selected layer and its kids if there is any.
Layer Properties Change the properties of the selected layer.
Set This Layer as Default Layer Set this selected layer as the default layer so that the new PDFill objects is put under this layer.
Clear the Current Default Layer Clear the current default layer. The new created PDFill objects will not put under a layer.

After creating layers, you will have a PDF layers similar like this.  You can show and hide the layer by clicking the check box inside the Layer Toolbar.

STEP 5. Create new PDFill Objects and select a PDF Layer.

The following PDFill Objects are supported:

Insert Single Line Text

Insert Multiple Line Text

Insert Check Box

Insert Image

Draw Line or Arrow Tool

Draw Rectangle , Circle or Basic Shapes Tool

Draw Curve Tool

If a layer is set as the current default layer, the new PDFill object will have this layer property when it is created.

You can change the layer property of a PDFill Object from its properties.

STEP 6. Save PDFill Project and Save into a new PDF to see the layer effect:

  • To save this project, select Menu File > Save Project or click from Toolbar. 
  • To save the edited PDF, select Menu File > Save PDF. Or, click  from Toolbar.  Then, select your options and save all editing into a new PDF file. 

    If you want to show PDF Layer when the PDF is opened,  use Initial View =>     Navigation Tab => Layers Panel and Page.

You can show and hide the layer by clicking the check box inside the Layer Toolbar.

pdf_layer_new.pdf shows the example of PDF with new layers:

 

 
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