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How to watermark the fillable PDFs without losing form filling ability in Acrobat Reader?

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You can apply watermark in the existing .NET PDF document without losing the Form fill ability in Acrobat reader. You can achieve this by importing loaded PDF document (PdfLoadedDocument) to a new PDF document (PdfDocument) and apply the Watermark. Refer to the following code example.


            //Load the Existing PDF document
            PdfLoadedDocument document = new PdfLoadedDocument("../../Form.pdf");
            //Initialize new PDF document
            PdfDocument doc = new PdfDocument();
            //Import Loaded document to new PDF document
            doc.ImportPage(document, 0);
            //Initialize Font
            Font f = new System.Drawing.Font("Times new roman", 36, FontStyle.Regular);
            PdfFont font = new PdfTrueTypeFont(f, true);
            //Getting graphics from 1st page
            PdfGraphics g = doc.Pages[0].Graphics;
            //Saving current graphics state
            PdfGraphicsState gs = g.Save();
            //Set transparency for graphics
            //Watermarking in the Graphics
            g.DrawString("Syncfusion Watermark", font, PdfPens.Red, PdfBrushes.Red, new PointF(50, 100));
            //Restoring saved graphics state
            // Save and close the document.


Refer to the following sample link.


I hope you enjoyed learning about how to watermark the fillable PDFs without losing form filling ability in Acrobat Reader.

You can refer to our .NET PDF feature tour page to know about its other groundbreaking feature representations. You can also explore our documentation to understand how to create and manipulate data.

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