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Watermarks in PDFs can be removed by third-party tools. If you need watermarks that are very hard to remove, rasterize the document: convert its pages to images so the content — including the watermark — becomes non-editable. Access the PDF content tree with Watermarker.get_content() and call rasterize().
WarningRasterization is irreversible: the original text and vector content cannot be restored afterwards, and the output file size usually increases.
The example adds a watermark, rasterizes every page to a PNG image at 100 DPI, and saves the result.
from groupdocs.watermark import Watermarker
from groupdocs.watermark.watermarks import TextWatermark, Font, Color
from groupdocs.watermark.options.pdf import PdfLoadOptions
from groupdocs.watermark.contents.pdf import PdfImageConversionFormat
def rasterize_document():
with Watermarker("./document.pdf", PdfLoadOptions()) as watermarker:
watermark = TextWatermark("CONFIDENTIAL", Font("Arial", 19.0))
watermark.foreground_color = Color.red
watermarker.add(watermark)
# Rasterize every page at 100x100 DPI to PNG images
content = watermarker.get_content()
content.rasterize(100, 100, PdfImageConversionFormat.PNG)
watermarker.save("./output.pdf")
if __name__ == "__main__":
rasterize_document()
document.pdf is the sample file used in this example. Click here to download it.
Binary file (PDF, 1.1 MB)
To rasterize a single page, call rasterize() on that page instead of the whole content:
from groupdocs.watermark import Watermarker
from groupdocs.watermark.options.pdf import PdfLoadOptions
from groupdocs.watermark.contents.pdf import PdfImageConversionFormat
def rasterize_page():
with Watermarker("./document.pdf", PdfLoadOptions()) as watermarker:
content = watermarker.get_content()
content.pages[0].rasterize(100, 100, PdfImageConversionFormat.PNG)
watermarker.save("./output.pdf")
if __name__ == "__main__":
rasterize_page()
document.pdf is the sample file used in this example. Click here to download it.
Binary file (PDF, 570 KB)
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