Adding Watermark to PDF using Python

Programming Samples: How To Add Watermark On PDF Files

Add a watermark artifact to a PDF document using Aspose.PDF for Python via .NET. A watermark is a visual overlay applied to pages for branding, security, or informational purposes. The example shows how to configure text appearance, positioning, rotation, and transparency before applying the watermark to a page.

1. Create a watermark artifact.
2. Configure text state.
3. Bind text to watermark.
4. Define positioning and style.
5. Attach watermark to a page.
6. Save the updated PDF.

import aspose.pdf as ap

def add_watermark(input_pdf, output_pdf):
    # Load the existing PDF document
    document = ap.Document(input_pdf)

    # Create a watermark artifact
    watermark = ap.WatermarkArtifact()

    # Configure text state for the watermark
    text_state = ap.text.TextState()
    text_state.font_size = 72
    text_state.foreground_color = ap.Color.blue
    text_state.font = ap.text.FontRepository.find_font("Courier")

    # Apply text and style to the watermark
    watermark.set_text_and_state("WATERMARK", text_state)

    # Position and style settings
    watermark.artifact_horizontal_alignment = ap.HorizontalAlignment.CENTER
    watermark.artifact_vertical_alignment = ap.VerticalAlignment.CENTER
    watermark.rotation = 45
    watermark.opacity = 0.5
    watermark.is_background = True

    # Add watermark to the first page
    document.pages[1].artifacts.append(watermark)

    # Save the updated PDF
    document.save(output_pdf)