How can I add an image to all pages of my PDF?

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It’s normal that the image is only added once; after all: you’re adding it only once. (Or you’ve left away some essential steps in your code snippet: see the edit I made.)

In any case: you can solve your problem by using a page event. There are some examples in Java here: http://itextpdf.com/sandbox/events

Or you can consult chapter 5 of my book. All examples are available in Java as well as in C#.

You should create a document in 5 steps and add an event in step 2:

// step 1
Document document = new Document();
// step 2
PdfWriter writer = PdfWriter.GetInstance(document, stream);
MyEvent event = new MyEvent();
writer.PageEvent = event;
// step 3
document.Open();
// step 4
// Add whatever content you want to add
// step 5
document.Close();

You have to write the MyEvent class yourself:

protected class MyEvent : PdfPageEventHelper {

    Image image;

    public override void OnOpenDocument(PdfWriter writer, Document document) {
        image = Image.GetInstance(Server.MapPath("~/images/draft.png"));
        image.SetAbsolutePosition(12, 300);
    }

    public override void OnEndPage(PdfWriter writer, Document document) {
        writer.DirectContent.AddImage(image);
    }
}

The OnEndPage() in class MyEvent will be triggered every time the PdfWriter has finished a page. Hence the image will be added on every page.

Caveat: it is important to create the image object outside the OnEndPage() method, otherwise the image bytes risk being added as many times as there are pages in your PDF (leading to a bloated PDF).

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