Existing objects in PDF document Leave feedback
Removing watermark from a particular page of PDF document using GroupDocs.Watermark consists of following steps.
- Load the document
- Create and initialize Image/text search criteria
- Find watermarks
- Remove watermarks
- Save the document
Following code sample removes watermarks from a particular page.
advanced_usage.add_watermarks_to_pdf.PdfRemoveWatermark
PdfLoadOptions loadOptions = new PdfLoadOptions();
// Constants.InDocumentPdf is an absolute or relative path to your document. Ex: "C:\\Docs\\document.pdf"
Watermarker watermarker = new Watermarker(Constants.InDocumentPdf, loadOptions);
// Initialize search criteria
ImageSearchCriteria imageSearchCriteria = new ImageDctHashSearchCriteria(Constants.LogoPng);
TextSearchCriteria textSearchCriteria = new TextSearchCriteria("Company Name");
PdfContent pdfContent = watermarker.getContent(PdfContent.class);
PossibleWatermarkCollection possibleWatermarks = pdfContent.getPages().get_Item(0).search(imageSearchCriteria.or(textSearchCriteria));
// Remove all found watermarks
for (int i = possibleWatermarks.getCount() - 1; i >= 0; i--)
{
possibleWatermarks.removeAt(i);
}
watermarker.save(Constants.OutDocumentPdf);
watermarker.close();
Search() method searches watermarks of all mentioned types, but in some cases, it’s necessary to analyze only one class of PDF entities. The following articles specifically deal with different types of the watermark objects in a PDF document.
Using GroupDocs.Watermark for .NET, you can extract information about all the XObjects in a PDF document. Following code sample performs this functionality.
advanced_usage.add_watermarks_to_pdf.PdfExtractXObjectInformation
PdfLoadOptions loadOptions = new PdfLoadOptions();
// Constants.InDocumentPdf is an absolute or relative path to your document. Ex: "C:\\Docs\\document.pdf"
Watermarker watermarker = new Watermarker(Constants.InDocumentPdf, loadOptions);
PdfContent pdfContent = watermarker.getContent(PdfContent.class);
for (PdfPage page : pdfContent.getPages())
{
for (PdfXObject xObject : page.getXObjects())
{
if (xObject.getImage() != null)
{
System.out.println(xObject.getImage().getWidth());
System.out.println(xObject.getImage().getHeight());
System.out.println(xObject.getImage().getBytes().length);
}
System.out.println(xObject.getText());
System.out.println(xObject.getX());
System.out.println(xObject.getY());
System.out.println(xObject.getWidth());
System.out.println(xObject.getHeight());
System.out.println(xObject.getRotateAngle());
}
}
watermarker.close();
You can also remove an XObject from a page using GroupDocs.Watermark. Following code sample removes an XObject from a particular page.
advanced_usage.add_watermarks_to_pdf.PdfRemoveXObject
PdfLoadOptions loadOptions = new PdfLoadOptions();
// Constants.InDocumentPdf is an absolute or relative path to your document. Ex: "C:\\Docs\\document.pdf"
Watermarker watermarker = new Watermarker(Constants.InDocumentPdf, loadOptions);
PdfContent pdfContent = watermarker.getContent(PdfContent.class);
// Remove XObject by index
pdfContent.getPages().get_Item(0).getXObjects().removeAt(0);
// Remove XObject by reference
pdfContent.getPages().get_Item(0).getXObjects().remove(pdfContent.getPages().get_Item(0).getXObjects().get_Item(0));
watermarker.save(Constants.OutDocumentPdf);
watermarker.close();
You can also find and remove all XObjects containing text with a particular formatting from a PDF document as shown in the below code sample.
advanced_usage.add_watermarks_to_pdf.PdfRemoveXObjectWithParticularTextFormatting
PdfLoadOptions loadOptions = new PdfLoadOptions();
// Constants.InDocumentPdf is an absolute or relative path to your document. Ex: "C:\\Docs\\document.pdf"
Watermarker watermarker = new Watermarker(Constants.InDocumentPdf, loadOptions);
PdfContent pdfContent = watermarker.getContent(PdfContent.class);
for (PdfPage page : pdfContent.getPages())
{
for (int i = page.getXObjects().getCount() - 1; i >= 0; i--)
{
for (FormattedTextFragment fragment : page.getXObjects().get_Item(i).getFormattedTextFragments())
{
if (fragment.getForegroundColor().equals(Color.getRed()))
{
page.getXObjects().removeAt(i);
break;
}
}
}
}
watermarker.save(Constants.OutDocumentPdf);
watermarker.close();
GroupDocs.Watermark API allows you to add watermark to all image XObjects in a PDF document. Following code sample serves this purpose.
advanced_usage.add_watermarks_to_pdf.PdfAddWatermarkToXObjects
PdfLoadOptions loadOptions = new PdfLoadOptions();
// Constants.InDocumentPdf is an absolute or relative path to your document. Ex: "C:\\Docs\\document.pdf"
Watermarker watermarker = new Watermarker(Constants.InDocumentPdf, loadOptions);
PdfContent pdfContent = watermarker.getContent(PdfContent.class);
// Initialize image or text watermark
TextWatermark watermark = new TextWatermark("Protected image", new Font("Arial", 8));
watermark.setHorizontalAlignment(HorizontalAlignment.Center);
watermark.setVerticalAlignment(VerticalAlignment.Center);
watermark.setRotateAngle(45);
watermark.setSizingType(SizingType.ScaleToParentDimensions);
watermark.setScaleFactor(1);
for (PdfPage page : pdfContent.getPages())
{
for (PdfXObject xObject : page.getXObjects())
{
if (xObject.getImage() != null)
{
// Add watermark to the image
xObject.getImage().add(watermark);
}
}
}
watermarker.save(Constants.OutDocumentPdf);
watermarker.close();
GroupDocs.Watermark allows you to edit and replace the text of the particular XObject. You can also replace XObject’s text with formatting as shown in the below code samples.
advanced_usage.add_watermarks_to_pdf.PdfReplaceTextForParticularXObject
PdfLoadOptions loadOptions = new PdfLoadOptions();
// Constants.InDocumentPdf is an absolute or relative path to your document. Ex: "C:\\Docs\\document.pdf"
Watermarker watermarker = new Watermarker(Constants.InDocumentPdf, loadOptions);
PdfContent pdfContent = watermarker.getContent(PdfContent.class);
for (PdfXObject xObject : pdfContent.getPages().get_Item(0).getXObjects())
{
// Replace text
if (xObject.getText().contains("Test"))
{
xObject.setText("Passed");
}
}
// Save document
watermarker.save(Constants.OutDocumentPdf);
watermarker.close();
advanced_usage.add_watermarks_to_pdf.ReplaceTextForParticularXObjectWithFormatting
PdfLoadOptions loadOptions = new PdfLoadOptions();
// Constants.InDocumentPdf is an absolute or relative path to your document. Ex: "C:\\Docs\\document.pdf"
Watermarker watermarker = new Watermarker(Constants.InDocumentPdf, loadOptions);
PdfContent pdfContent = watermarker.getContent(PdfContent.class);
for (PdfXObject xObject : pdfContent.getPages().get_Item(0).getXObjects())
{
// Replace text
if (xObject.getText().contains("Test"))
{
xObject.getFormattedTextFragments().clear();
xObject.getFormattedTextFragments().add("Passed", new Font("Calibri", 19, FontStyle.Bold), Color.getRed(), Color.getAqua());
}
}
// Save document
watermarker.save(Constants.OutDocumentPdf);
watermarker.close();
Using GroupDocs.Watermark, you can also replace the image of a particular XObject. GroupDocs.Watermark allows you to loop through all the XObjects of a particular page and you can replace the image of particular XObjects using some condition as shown in the below code sample.
advanced_usage.add_watermarks_to_pdf.PdfReplaceImageForParticularXObject
PdfLoadOptions loadOptions = new PdfLoadOptions();
// Constants.InDocumentPdf is an absolute or relative path to your document. Ex: "C:\\Docs\\document.pdf"
Watermarker watermarker = new Watermarker(Constants.InDocumentPdf, loadOptions);
PdfContent pdfContent = watermarker.getContent(PdfContent.class);
File imageFile = new File(Constants.TestPng);
byte[] imageBytes = new byte[(int) imageFile.length()];
InputStream imageStream = new FileInputStream(imageFile);
imageStream.read(imageBytes);
imageStream.close();
// Replace image
for (PdfXObject xObject : pdfContent.getPages().get_Item(0).getXObjects())
{
if (xObject.getImage() != null)
{
xObject.setImage(new PdfWatermarkableImage(imageBytes));
}
}
// Save document
watermarker.save(Constants.OutDocumentPdf);
watermarker.close();
GroupDocs.Watermark enables you to extract the information about the artifacts in a PDF document as shown in the below code sample.
advanced_usage.add_watermarks_to_pdf.PdfExtractArtifactInformation
PdfLoadOptions loadOptions = new PdfLoadOptions();
// Constants.InDocumentPdf is an absolute or relative path to your document. Ex: "C:\\Docs\\document.pdf"
Watermarker watermarker = new Watermarker(Constants.InDocumentPdf, loadOptions);
PdfContent pdfContent = watermarker.getContent(PdfContent.class);
for (PdfPage page : pdfContent.getPages())
{
for (PdfArtifact artifact : page.getArtifacts())
{
System.out.println(artifact.getArtifactType());
System.out.println(artifact.getArtifactSubtype());
if (artifact.getImage() != null)
{
System.out.println(artifact.getImage().getWidth());
System.out.println(artifact.getImage().getHeight());
System.out.println(artifact.getImage().getBytes().length);
}
System.out.println(artifact.getText());
System.out.println(artifact.getOpacity());
System.out.println(artifact.getX());
System.out.println(artifact.getY());
System.out.println(artifact.getWidth());
System.out.println(artifact.getHeight());
System.out.println(artifact.getRotateAngle());
}
}
watermarker.close();
Following code sample shows how to remove an artifact from a particular page of the PDF document.
advanced_usage.add_watermarks_to_pdf.PdfRemoveArtifact
PdfLoadOptions loadOptions = new PdfLoadOptions();
// Constants.InDocumentPdf is an absolute or relative path to your document. Ex: "C:\\Docs\\document.pdf"
Watermarker watermarker = new Watermarker(Constants.InDocumentPdf, loadOptions);
PdfContent pdfContent = watermarker.getContent(PdfContent.class);
// Remove Artifact by index
pdfContent.getPages().get_Item(0).getArtifacts().removeAt(0);
// Remove Artifact by reference
pdfContent.getPages().get_Item(0).getArtifacts().remove(pdfContent.getPages().get_Item(0).getArtifacts().get_Item(0));
watermarker.save(Constants.OutDocumentPdf);
watermarker.close();
You can also find and remove all artifacts containing text with a particular formatting from a PDF document as shown in the below code sample.
advanced_usage.add_watermarks_to_pdf.PdfRemoveArtifactsWithParticularTextFormatting
PdfLoadOptions loadOptions = new PdfLoadOptions();
// Constants.InDocumentPdf is an absolute or relative path to your document. Ex: "C:\\Docs\\document.pdf"
Watermarker watermarker = new Watermarker(Constants.InDocumentPdf, loadOptions);
PdfContent pdfContent = watermarker.getContent(PdfContent.class);
for (PdfPage page : pdfContent.getPages())
{
for (int i = page.getArtifacts().getCount() - 1; i >= 0; i--)
{
for (FormattedTextFragment fragment : page.getArtifacts().get_Item(i).getFormattedTextFragments())
{
if (fragment.getFont().getSize() > 42)
{
page.getArtifacts().removeAt(i);
break;
}
}
}
}
watermarker.save(Constants.OutDocumentPdf);
watermarker.close();
GroupDocs.Watermark API also provides the feature of adding watermark to all image artifacts in a PDF document. Following code sample adds watermark to all image artifacts.
advanced_usage.add_watermarks_to_pdf.PdfAddWatermarkToImageArtifacts
PdfLoadOptions loadOptions = new PdfLoadOptions();
// Constants.InDocumentPdf is an absolute or relative path to your document. Ex: "C:\\Docs\\document.pdf"
Watermarker watermarker = new Watermarker(Constants.InDocumentPdf, loadOptions);
PdfContent pdfContent = watermarker.getContent(PdfContent.class);
// Initialize image or text watermark
TextWatermark watermark = new TextWatermark("Protected image", new Font("Arial", 8));
watermark.setHorizontalAlignment(HorizontalAlignment.Center);
watermark.setVerticalAlignment(VerticalAlignment.Center);
watermark.setRotateAngle(45);
watermark.setSizingType(SizingType.ScaleToParentDimensions);
watermark.setScaleFactor(1);
for (PdfPage page : pdfContent.getPages())
{
for (PdfArtifact artifact : page.getArtifacts())
{
if (artifact.getImage() != null)
{
// Add watermark to the image
artifact.getImage().add(watermark);
}
}
}
watermarker.save(Constants.OutDocumentPdf);
watermarker.close();
GroupDocs.Watermark allows you to edit and replace the text of the particular artifacts. You can also replace artifact’s text with formatting as shown in the below code samples.
advanced_usage.add_watermarks_to_pdf.PdfReplaceTextForParticularArtifact
PdfLoadOptions loadOptions = new PdfLoadOptions();
// Constants.InDocumentPdf is an absolute or relative path to your document. Ex: "C:\\Docs\\document.pdf"
Watermarker watermarker = new Watermarker(Constants.InDocumentPdf, loadOptions);
PdfContent pdfContent = watermarker.getContent(PdfContent.class);
for (PdfArtifact artifact : pdfContent.getPages().get_Item(0).getArtifacts())
{
// Replace text
if (artifact.getText().contains("Test"))
{
artifact.setText("Passed");
}
}
// Save document
watermarker.save(Constants.OutDocumentPdf);
watermarker.close();
advanced_usage.add_watermarks_to_pdf.PdfReplaceTextForParticularArtifactWithFormatting
PdfLoadOptions loadOptions = new PdfLoadOptions();
// Constants.InDocumentPdf is an absolute or relative path to your document. Ex: "C:\\Docs\\document.pdf"
Watermarker watermarker = new Watermarker(Constants.InDocumentPdf, loadOptions);
PdfContent pdfContent = watermarker.getContent(PdfContent.class);
for (PdfArtifact artifact : pdfContent.getPages().get_Item(0).getArtifacts())
{
// Replace text
if (artifact.getText().contains("Test"))
{
artifact.getFormattedTextFragments().clear();
artifact.getFormattedTextFragments().add("Passed", new Font("Calibri", 19, FontStyle.Bold), Color.getRed(), Color.getAqua());
}
}
// Save document
watermarker.save(Constants.OutDocumentPdf);
watermarker.close();
Using GroupDocs.Watermark, you can also replace the image of a particular artifact. GroupDocs.Watermark allows you to loop through all the artifacts of a particular page and you can replace the image of particular artifacts using some condition as shown in the below code sample.
advanced_usage.add_watermarks_to_pdf.PdfReplaceImageForParticularArtifact
PdfLoadOptions loadOptions = new PdfLoadOptions();
// Constants.InDocumentPdf is an absolute or relative path to your document. Ex: "C:\\Docs\\document.pdf"
Watermarker watermarker = new Watermarker(Constants.InDocumentPdf, loadOptions);
PdfContent pdfContent = watermarker.getContent(PdfContent.class);
File imageFile = new File(Constants.TestPng);
byte[] imageBytes = new byte[(int) imageFile.length()];
InputStream imageStream = new FileInputStream(imageFile);
imageStream.read(imageBytes);
imageStream.close();
// Replace image
for (PdfArtifact artifact : pdfContent.getPages().get_Item(0).getArtifacts())
{
if (artifact.getImage() != null)
{
artifact.setImage(new PdfWatermarkableImage(imageBytes));
}
}
// Save document
watermarker.save(Constants.OutDocumentPdf);
watermarker.close();
You can also extract information about all the annotations in a PDF document using GroupDocs.Watermark as shown in below code sample.
advanced_usage.add_watermarks_to_pdf.PdfExtractAnnotationInformation
PdfLoadOptions loadOptions = new PdfLoadOptions();
// Constants.InDocumentPdf is an absolute or relative path to your document. Ex: "C:\\Docs\\document.pdf"
Watermarker watermarker = new Watermarker(Constants.InDocumentPdf, loadOptions);
PdfContent pdfContent = watermarker.getContent(PdfContent.class);
for (PdfPage page : pdfContent.getPages())
{
for (PdfAnnotation annotation : page.getAnnotations())
{
System.out.println(annotation.getAnnotationType());
if (annotation.getImage() != null)
{
System.out.println(annotation.getImage().getWidth());
System.out.println(annotation.getImage().getHeight());
System.out.println(annotation.getImage().getBytes().length);
}
System.out.println(annotation.getText());
System.out.println(annotation.getX());
System.out.println(annotation.getY());
System.out.println(annotation.getWidth());
System.out.println(annotation.getHeight());
System.out.println(annotation.getRotateAngle());
}
}
watermarker.close();
Following code sample can be used to remove a particular annotation from a PDF document.
advanced_usage.add_watermarks_to_pdf.PdfRemoveAnnotation
PdfLoadOptions loadOptions = new PdfLoadOptions();
// Constants.InDocumentPdf is an absolute or relative path to your document. Ex: "C:\\Docs\\document.pdf"
Watermarker watermarker = new Watermarker(Constants.InDocumentPdf, loadOptions);
PdfContent pdfContent = watermarker.getContent(PdfContent.class);
// Remove Annotation by index
pdfContent.getPages().get_Item(0).getAnnotations().removeAt(0);
// Remove Annotation by reference
pdfContent.getPages().get_Item(0).getAnnotations().remove(pdfContent.getPages().get_Item(0).getAnnotations().get_Item(0));
watermarker.save(Constants.OutDocumentPdf);
watermarker.close();
You can also find and remove all annotations containing text with a particular formatting from a PDF document as shown in the below code sample.
advanced_usage.add_watermarks_to_pdf.PdfRemoveAnnotationsWithParticularTextFormatting
PdfLoadOptions loadOptions = new PdfLoadOptions();
// Constants.InDocumentPdf is an absolute or relative path to your document. Ex: "C:\\Docs\\document.pdf"
Watermarker watermarker = new Watermarker(Constants.InDocumentPdf, loadOptions);
PdfContent pdfContent = watermarker.getContent(PdfContent.class);
for (PdfPage page : pdfContent.getPages())
{
for (int i = page.getAnnotations().getCount() - 1; i >= 0; i--)
{
for (FormattedTextFragment fragment : page.getAnnotations().get_Item(i).getFormattedTextFragments())
{
if (fragment.getFont().getFamilyName() == "Verdana")
{
page.getAnnotations().removeAt(i);
break;
}
}
}
}
watermarker.save(Constants.OutDocumentPdf);
watermarker.close();
Similar to the other types, the watermark can be added to image annotations in PDF documents as shown in the below code sample.
advanced_usage.add_watermarks_to_pdf.PdfAddWatermarkToAnnotationImages
PdfLoadOptions loadOptions = new PdfLoadOptions();
// Constants.InDocumentPdf is an absolute or relative path to your document. Ex: "C:\\Docs\\document.pdf"
Watermarker watermarker = new Watermarker(Constants.InDocumentPdf, loadOptions);
PdfContent pdfContent = watermarker.getContent(PdfContent.class);
// Initialize image or text watermark
TextWatermark watermark = new TextWatermark("Protected image", new Font("Arial", 8));
watermark.setHorizontalAlignment(HorizontalAlignment.Center);
watermark.setVerticalAlignment(VerticalAlignment.Center);
watermark.setRotateAngle(45);
watermark.setSizingType(SizingType.ScaleToParentDimensions);
watermark.setScaleFactor(1);
for (PdfPage page : pdfContent.getPages())
{
for (PdfAnnotation annotation : page.getAnnotations())
{
if (annotation.getImage() != null)
{
// Add watermark to the image
annotation.getImage().add(watermark);
}
}
}
watermarker.save(Constants.OutDocumentPdf);
watermarker.close();
GroupDocs.Watermark allows you to edit and replace the text of the particular annotations. You can also replace annotation’s text with formatting as shown in the below code samples.
advanced_usage.add_watermarks_to_pdf.PdfReplaceTextForParticularAnnotation
PdfLoadOptions loadOptions = new PdfLoadOptions();
// Constants.InDocumentPdf is an absolute or relative path to your document. Ex: "C:\\Docs\\document.pdf"
Watermarker watermarker = new Watermarker(Constants.InDocumentPdf, loadOptions);
PdfContent pdfContent = watermarker.getContent(PdfContent.class);
for (PdfAnnotation annotation : pdfContent.getPages().get_Item(0).getAnnotations())
{
// Replace text
if (annotation.getText().contains("Test"))
{
annotation.setText("Passed");
}
}
// Save document
watermarker.save(Constants.OutDocumentPdf);
watermarker.close();
advanced_usage.add_watermarks_to_pdf.PdfReplaceTextForParticularAnnotationWithFormatting
PdfLoadOptions loadOptions = new PdfLoadOptions();
// Constants.InDocumentPdf is an absolute or relative path to your document. Ex: "C:\\Docs\\document.pdf"
Watermarker watermarker = new Watermarker(Constants.InDocumentPdf, loadOptions);
PdfContent pdfContent = watermarker.getContent(PdfContent.class);
for (PdfAnnotation annotation : pdfContent.getPages().get_Item(0).getAnnotations())
{
// Replace text
if (annotation.getText().contains("Test"))
{
annotation.getFormattedTextFragments().clear();
annotation.getFormattedTextFragments().add("Passed", new Font("Calibri", 19, FontStyle.Bold), Color.getRed(), Color.getAqua());
}
}
// Save document
watermarker.save(Constants.OutDocumentPdf);
watermarker.close();
Using GroupDocs.Watermark, you can also replace the image of a particular annotation. GroupDocs.Watermark allows you to loop through all the annotations of a particular page and you can replace the image of particular annotations using some condition as shown in the below code sample.
advanced_usage.add_watermarks_to_pdf.PdfReplaceImageForParticularAnnotation
PdfLoadOptions loadOptions = new PdfLoadOptions();
// Constants.InDocumentPdf is an absolute or relative path to your document. Ex: "C:\\Docs\\document.pdf"
Watermarker watermarker = new Watermarker(Constants.InDocumentPdf, loadOptions);
PdfContent pdfContent = watermarker.getContent(PdfContent.class);
File imageFile = new File(Constants.TestPng);
byte[] imageBytes = new byte[(int) imageFile.length()];
InputStream imageStream = new FileInputStream(imageFile);
imageStream.read(imageBytes);
imageStream.close();
// Replace image
for (PdfAnnotation annotation : pdfContent.getPages().get_Item(0).getAnnotations())
{
if (annotation.getImage() != null)
{
annotation.setImage(new PdfWatermarkableImage(imageBytes));
}
}
// Save document
watermarker.save(Constants.OutDocumentPdf);
watermarker.close();
You may easily run the code above and see the feature in action in our GitHub examples:
Along with full featured Java library we provide simple, but powerful free Apps.
You are welcome to add watermark to PDF, DOC, DOCX, PPT, PPTX, XLS, XLSX, Emails and more with our free online Free Online Document Watermarking App.
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