For comparative guides on how this differs from traditional PDF libraries, check IronPDF's comparison blog which contrasts QuestPDF with overlay-based tools. Handling Image Opacity
void ComposeImageWatermark(IContainer container) { // Load your image (ensure the file exists in your bin directory or use a stream) var imageData = File.ReadAllBytes("logo.png"); container .AlignCenter() .AlignMiddle() .Width(150) // Set a fixed width for the watermark .Opacity(0.2f) // Make the image semi-transparent .Image(imageData);
If you need to remove a watermark from a document you authored: quest pdf watermark
: Best for letterheads or light branding that should sit behind the main text. Step-by-Step Guide Define the Slot : Inside your document's element, call page.Foreground() Add Content : Use standard elements like Style & Position : Apply modifiers to set the look and placement. Text Watermarks .FontSize() .FontColor() to create the classic diagonal gray text. Image Watermarks
Even during a simple operation, problems arise. Here are fixes for the top 3 issues. For comparative guides on how this differs from
If you need to watermark 1,000 PDFs automatically, use qpdf or pdftk with ImageMagick.
Used for content that should appear on top of everything else. This is useful for high-priority security stamps or decorative borders. Implementation Guide (C#) Text Watermarks
A static watermark is identical on every copy of the PDF. For example, a real estate agency might watermark all their listing sheets with their logo.