Rasterize document or page Leave feedback
The watermark can be removed from the PDF documents using third-party tools. However, if you want to get a watermark that is almost impossible to remove, you can consider PDF document rasterization. GroupDocs.Watermark provides the feature to convert all the pages of a PDF document to raster images with only one line of code.
Following code snippet is used to rasterize the PDF document to protect added watermarks.
advanced_usage.add_watermarks_to_pdf.PdfRasterizeDocument
PdfLoadOptions loadOptions = new PdfLoadOptions();
// Specify an absolute or relative path to your document. Ex: "C:\\Docs\\document.pdf"
Watermarker watermarker = new Watermarker("document.pdf", loadOptions);
// Initialize image or text watermark
TextWatermark watermark = new TextWatermark("Do not copy", new Font("Arial", 8));
watermark.setHorizontalAlignment(HorizontalAlignment.Center);
watermark.setVerticalAlignment(VerticalAlignment.Center);
watermark.setRotateAngle(45);
watermark.setSizingType(SizingType.ScaleToParentDimensions);
watermark.setScaleFactor(1);
watermark.setOpacity(0.5);
// Add watermark of any type first
watermarker.add(watermark);
PdfContent pdfContent = watermarker.getContent(PdfContent.class);
// Rasterize all pages
pdfContent.rasterize(100, 100, PdfImageConversionFormat.Png);
// Content of all pages is replaced with raster images
watermarker.save("document.pdf");
watermarker.close();
WarningYou can’t restore document content after saving the document. Rasterization significantly increases the size of the resultant PDF file.
The API also allows you to rasterize any particular page of the PDF document. Following code snippet is used to rasterize a page of the PDF document.
advanced_usage.add_watermarks_to_pdf.PdfRasterizePage
PdfLoadOptions loadOptions = new PdfLoadOptions();
// Specify an absolute or relative path to your document. Ex: "C:\\Docs\\document.pdf"
Watermarker watermarker = new Watermarker("document.pdf", loadOptions);
// Initialize image or text watermark
TextWatermark watermark = new TextWatermark("Do not copy", new Font("Arial", 8));
watermark.setHorizontalAlignment(HorizontalAlignment.Center);
watermark.setVerticalAlignment(VerticalAlignment.Center);
watermark.setRotateAngle(45);
watermark.setSizingType(SizingType.ScaleToParentDimensions);
watermark.setScaleFactor(1);
watermark.setOpacity(0.5);
// Add watermark of any type first
PdfArtifactWatermarkOptions options = new PdfArtifactWatermarkOptions();
options.setPageIndex(0);
watermarker.add(watermark, options);
// Rasterize the first page
PdfContent pdfContent = watermarker.getContent(PdfContent.class);
pdfContent.getPages().get_Item(0).rasterize(100, 100, PdfImageConversionFormat.Png);
// Content of the first page is replaced with raster image
watermarker.save("document.pdf");
watermarker.close();
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