Watermark PDFs

How to Add a Watermark to PDFs

Add a layer of security and protect confidential information with watermarks. Embedding a watermark to the page content makes it more difficult to tamper with than adding a watermark annotation. The resulting document is saved encrypted, with only print and view permissions. Define type style, font size, color and opacity as required.

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C++

Java

C++

				
					DURING
        APDFLDoc apdflInDoc(csInputFile.c_str(), true);
        APDFLDoc apdflWaterMarkDoc(csInputWatermarkFile.c_str(), true);
        ASInt32 nWatermarkPgNUm = 0;

        PDPage pdPageWatermark= PDDocAcquirePage(apdflWaterMarkDoc.getPDDoc(), nWatermarkPgNUm);

        PDPageRange pageRange;
        pageRange.startPage = 0;
        pageRange.endPage = PDLastPage;
        pageRange.pageSpec = PPDAllPages;

        PDDocAddWatermarkParamsRec watermarkParams;
        memset(&watermarkParams, 0, sizeof(PDDocAddWatermarkParamsRec));
        watermarkParams.size = sizeof(PDDocAddWatermarkParamsRec);
        watermarkParams.targetRange = pageRange;
		watermarkParams.Opacity = 0.5f;
        watermarkParams.wtrmrkDrawOption = kPDWatermarkTryFormXObject;

        PDDocAddWatermarkFromPDPage(apdflInDoc.getPDDoc(), pdPageWatermark, &watermarkParams);

    // Save the document, and release resources.
        apdflInDoc.saveDoc(csOutputFile.c_str());

        PDPageRelease(pdPageWatermark);
    HANDLER
        errCode = ERRORCODE;
        libInit.displayError(errCode);
    END_HANDLER

				
					using (var watermarkDoc = new Document(sWatermark))
	using (var doc = new Document(sInput))
	{
		WatermarkParams watermarkParams = new WatermarkParams()
		{
		
		WatermarkDrawOption = WatermarkDrawOption.TryFormXObject,
			Opacity = 0.5f,
		};
		watermarkParams.TargetRange.PageSpec = PageSpec.AllPages;

		using (var watermarkPage = watermarkDoc.GetPage(0))
			doc.Watermark(watermarkPage, watermarkParams);

		doc.Save(SaveFlags.Full , sOutput);
	}

Java

				
					Document watermarkDoc = new Document(sWatermark);
	Document doc = new Document(sInput);

	WatermarkParams watermarkParams = new WatermarkParams()
	
	{{
		setOpacity(0.5f);
	}};
	
	watermarkParams.getTargetRange().setPageSpec(PageSpec.ALL_PAGES);

	doc.watermark(watermarkDoc.getPage(0), watermarkParams);

	doc.save(EnumSet.of(SaveFlags.FULL), sOutput);