This article demonstrates how to add multiline watermarks to a PowerPoint slide using Spire.Presentation for Java. To add watermarks to all slides, use one more for loop outside the two for loops in the following code snippet.

import com.spire.presentation.*;
import com.spire.presentation.Presentation;
import com.spire.presentation.drawing.*;

import java.awt.*;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;


//Create a Presentation object
Presentation presentation = new Presentation();

//Load the sample PowerPoint file
presentation.loadFromFile("C:\\Users\\Administrator\\Desktop\\Spire.Presentation.pptx");

//Specify watermark text
String watermarkText = "E-iceblue";

//Get the size of the watermark text
Image image = new BufferedImage(1, 1, BufferedImage.TYPE_INT_ARGB);
Graphics2D g2d = (Graphics2D) image.getGraphics();
Font font = new Font("Arial", Font.BOLD, 20);
g2d.setFont(font);
FontMetrics fm = g2d.getFontMetrics();
Rectangle2D strSize = fm.getStringBounds(watermarkText, g2d);

//Initialize x and y coordinate
float x = 30;
float y = 80;

for (int rowNum = 0; rowNum < 4; rowNum++) {
    for (int colNum = 0; colNum < 5; colNum++) {

        //Add a rectangle shape
        Rectangle2D rect = new Rectangle2D.Float(x, y, (float) strSize.getWidth() + 10, (float) strSize.getHeight());
        IAutoShape shape = presentation.getSlides().get(0).getShapes().appendShape(ShapeType.RECTANGLE, rect);

        //Set the style of the shape
        shape.getFill().setFillType(FillFormatType.NONE);
        shape.getShapeStyle().getLineColor().setColor(new Color(1, 1, 1, 0));
        shape.setRotation(-45);
        shape.getLocking().setSelectionProtection(true);
        shape.getLine().setFillType(FillFormatType.NONE);

        //Add watermark text to the shape
        shape.getTextFrame().setText(watermarkText);
        PortionEx textRange = shape.getTextFrame().getTextRange();

        //Set the style of the text range
        textRange.getFill().setFillType(FillFormatType.SOLID);
        textRange.getFill().getSolidColor().setColor(Color.pink);
        textRange.setLatinFont(new TextFont(font.getName()));
        textRange.setFontMinSize(font.getSize());

        x += (100 + strSize.getWidth());

    }
    x = 30;
    y += (100 + strSize.getHeight());
}

//Save the document
presentation.saveToFile("output/Watermark.pptx", FileFormat.PPTX_2013);

This article demonstrates how to convert shapes and SmartArt graphics in Excel to Image in C# using Spire.XLS for .NET.

The input Excel file:

using Spire.Xls;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;

namespace Convert_Shapes_and_SmartArt_to_Image
{
    class Program
    {
        static void Main(string[] args)
        {
            //Create a Workbook object
            Workbook workbook = new Workbook();
            //Load the Excel file
            workbook.LoadFromFile("Sample.xlsx");

            //Get the first worksheet
            Worksheet sheet = workbook.Worksheets[0];

            //Create a SaveShapeTypeOption object
            SaveShapeTypeOption shapelist = new SaveShapeTypeOption();
            //Save shapes and SmartArt graphics in the worksheet to images
            List<Bitmap> images = sheet.SaveShapesToImage(shapelist);

            //Save images to file
            int index = 0;
            foreach (Image img in images)
            {
                img.Save("Image/" + "toImage" + index + ".Png", ImageFormat.Png);
                index++;
            }
        }
    }
}

Imports Spire.Xls
Imports System.Collections.Generic
Imports System.Drawing.Imaging

Namespace Convert_Shapes_and_SmartArt_to_Image
    Friend Class Program
        Private Shared Sub Main(ByVal args As String())
            'Create a Workbook object
            Dim workbook As Workbook = New Workbook()
            'Load the Excel file
            workbook.LoadFromFile("Sample.xlsx")

            'Get the first worksheet
            Dim sheet As Worksheet = workbook.Worksheets(0)

            'Create a SaveShapeTypeOption object
            Dim shapelist As SaveShapeTypeOption = New SaveShapeTypeOption()
            'Save shapes and SmartArt graphics in the worksheet to images
            Dim images As List(Of Bitmap) = sheet.SaveShapesToImage(shapelist)

            'Save images to file
            Dim index As Integer = 0

            For Each img As Image In images
                img.Save("Image/" & "toImage" & index & ".Png", ImageFormat.Png)
                index += 1
            Next
        End Sub
    End Class
End Namespace

Converted images:

This article demonstrates how to verify if a Word document is password protected or not using Spire.Doc for Java.

The following image shows that the input Word document is protected with password:

import com.spire.doc.Document;

public class DetectIfWordIsPasswordProtected {
    public static void main(String []args){
        //Detect if the Word document is password protected
        boolean isPasswordProtected = Document.isEncrypted("C:\\Users\\Administrator\\Desktop\\Sample.docx");
        if(isPasswordProtected)
        {
            System.out.println("The document is password protected.");
        }
        else
        {
            System.out.println("The document is not password protected.");
        }
    }
}

Output:

This article demonstrates how to compress high-resolution images of a PDF document using Spire.PDF for Java. Images in low-resolution will not be compressed anymore.

public static void main(String[] args) throws Exception {
        //Load the sample PDF document
        PdfDocument doc = new PdfDocument("C:\\Users\\Administrator\\Desktop\\Images.pdf");

        //Set IncrementalUpdate to false
        doc.getFileInfo().setIncrementalUpdate(false);

        //Declare a PdfPageBase variable
        PdfPageBase page;

        // Create the PdfImageHelper object
        PdfImageHelper imageHelper = new PdfImageHelper();

        //Loop through the pages
        for (int i = 0; i < doc.getPages().getCount(); i++) {

            //Get the specific page
            page = doc.getPages().get(i);
            if (page != null) {

                if(page.getImagesInfo() != null){

                    //Loop through the images in the page
                    for (PdfImageInfo info : imageHelper.getImagesInfo(page))

                        //Use tryCompressImage method the compress high-resolution images
                        info.tryCompressImage();
                    }
                }
            }
        //Save to file
        doc.saveToFile("output/Compressed.pdf");
        }

This article demonstrates how to extract files from a PDF portfolio in Java using Spire.PDF for Java.

The input PDF:

import com.spire.pdf.PdfDocument;
import com.spire.pdf.attachments.PdfAttachment;

import java.io.*;

public class ReadPortfolio {
    public static void main(String []args) throws IOException {
        //Create a PdfDocument instance
        PdfDocument pdf = new PdfDocument();
        //Load the PDF file
        pdf.loadFromFile("Portfolio.pdf");

        //Loop through the attachments in the file
       for(Object obj : pdf.getAttachments()) {
            PdfAttachment attachment = (PdfAttachment) obj;
            //Extract files
            String fileName = attachment.getFileName();
            OutputStream fos = new FileOutputStream("extract/" + fileName);
            fos.write(attachment.getData());
        }

        pdf.dispose();
    }
}

Output:

A digital signature is a modern alternative to signing documents manually on paper with pen. It uses an advanced mathematical technique to check the authenticity and integrity of digital documents, which guarantees that the contents in a digital document comes from the signer and has not been altered since then. Sometimes PowerPoint documents that contain confidential information may require a signature. In this article, you will learn how to programmatically add or remove digital signatures in PowerPoint using Spire.Presentation for .NET.

• Add a Digital Signature to PowerPoint in C# and VB.NET
• Remove All Digital Signatures from PowerPoint in C# and VB.NET

Install Spire.Presentation for .NET

To begin with, you need to add the DLL files included in the Spire.Presentation for.NET package as references in your .NET project. The DLL files can be either downloaded from this link or installed via NuGet.

PM> Install-Package Spire.Presentation

Add a Digital Signature to PowerPoint in C# and VB.NET

To add a digital signature, you'll need to have a valid signature certificate first. Then you can digitally sign a PowerPoint document with the certificate using Presentation.AddDigitalSignature (X509Certificate2 certificate, string comments, DateTime signTime) method. The detailed steps are as follows.

• Create a Presentation instance.
• Load a sample PowerPoint document using Presentation.LoadFromFile() method.
• Initializes an instance of X509Certificate2 class with the certificate file name and password.
• Add a digital signature to the PowerPoint document using Presentation.AddDigitalSignature (X509Certificate2 certificate, string comments, DateTime signTime) method.
• Save result document using Presentation.SaveToFile() method.

using Spire.Presentation;
using System;

namespace AddDigitalSignature
{
    class Program
    {
        static void Main(string[] args)
        {
            //Create a Presentation instance
            Presentation ppt = new Presentation();
			
	    //Load a PowerPoint document
            ppt.LoadFromFile("Input.pptx");

            //Add a digital signature
            ppt.AddDigitalSignature("gary.pfx", "e-iceblue", "test", DateTime.Now);

            //Save the result document
            ppt.SaveToFile("AddDigitalSignature_result.pptx", FileFormat.Pptx2010);
            System.Diagnostics.Process.Start("AddDigitalSignature_result.pptx");

            //Dispose
            ppt.Dispose();			
        }
    }
}

Imports Spire.Presentation
Imports System

Namespace AddDigitalSignature
    Class Program
        Private Shared Sub Main(ByVal args As String())
            'Load a ppt document
            Dim ppt As Presentation = New Presentation()
            ppt.LoadFromFile("Input.pptx")
	    'Add a digital signature
            ppt.AddDigitalSignature("gary.pfx", "e-iceblue", "test", Date.Now)
	    'Save the document
            ppt.SaveToFile("AddDigitalSignature.pptx", FileFormat.Pptx2013)
	    'Dispose
	    ppt.Dispose()		
        End Sub
    End Class
End Namespace

Remove All Digital Signatures from PowerPoint in C# and VB.NET

At some point you may need to remove the digital signatures from a PowerPoint document. Spire.Presentation for .NET provides the Presentation.RemoveAllDigitalSignatures() method to remove all digital signatures at once. The detailed steps are as follows:

• Create a Presentation instance.
• Load a sample PowerPoint document using Presentation.LoadFromFile() method.
• Determine if the document contains digital signatures using Presentation.IsDigitallySigned property.
• Remove all digital signatures from the document using Presentation.RemoveAllDigitalSignatures() method.
• Save the result document using Presentation.SaveToFile() method.

using Spire.Presentation;

namespace RemoveDigitalSignature
{
    class Program
    {
        static void Main(string[] args)
        {
            //Create a Presentation instance
            Presentation ppt = new Presentation();

            //Load a PowerPoint document 
            ppt.LoadFromFile("AddDigitalSignature.pptx");

            //Detect if the document is digitally signed
            if (ppt.IsDigitallySigned == true)
            {
                //Remove all digital signatures
                ppt.RemoveAllDigitalSignatures();
            }

            //Save the result document
            ppt.SaveToFile("RemoveDigitalSignature.pptx", FileFormat.Pptx2013);

        }
    }
}

Imports Spire.Presentation

Namespace RemoveDigitalSignature
    Class Program
        Private Shared Sub Main(ByVal args() As String)
            'Create a Presentation instance
            Dim ppt As Presentation = New Presentation

            'Load a PowerPoint document 
            ppt.LoadFromFile("AddDigitalSignature.pptx")

            'Detect if the document is digitally signed
            If (ppt.IsDigitallySigned = True) Then

            'Remove all digital signatures
            ppt.RemoveAllDigitalSignatures()
            End If

            'Save the result document
            ppt.SaveToFile("RemoveDigitalSignature.pptx", FileFormat.Pptx2013)
        End Sub
    End Class
End Namespace

Apply for a Temporary License

If you'd like to remove the evaluation message from the generated documents, or to get rid of the function limitations, please request a 30-day trial license for yourself.

This article shows you how to download a PDF document from an URL using Spire.PDF with C# and VB.NET.

using System.IO;
using System.Net;
using Spire.Pdf;

namespace DownloadPdfFromUrl
{
    class Program
    {
        static void Main(string[] args)
        {
            //Create a PdfDocument object
            PdfDocument doc = new PdfDocument();

            //Create a WebClient object
            WebClient webClient = new WebClient();

            //Download data from URL and save as memory stream
            using (MemoryStream ms = new MemoryStream(webClient.DownloadData("https://www.e-iceblue.com/article/toDownload.pdf")))
            {
                //Load the stream
                doc.LoadFromStream(ms);
            }

            //Save to PDF file
            doc.SaveToFile("result.pdf", FileFormat.PDF);
        }
    }
}

Imports System.IO
Imports System.Net
Imports Spire.Pdf

Namespace DownloadPdfFromUrl
    Class Program
        Shared  Sub Main(ByVal args() As String)
            'Create a PdfDocument object
            Dim doc As PdfDocument = New PdfDocument()

            'Create a WebClient object
            Dim webClient As WebClient = New WebClient()

           'Download data from URL and save as memory stream
           Dim pdfData As Byte() = webClient.DownloadData(""https://www.e-iceblue.com/article/toDownload.pdf"")
           Using ms As New MemoryStream(pdfData)
           'Load the stream
           doc.LoadFromStream(ms)
 End Using

 'Save to PDF file
 doc.SaveToFile(""result.pdf"", FileFormat.PDF)
        End Sub
    End Class
End Namespace

This article will demonstrate how to use Spire.XLS for Java to remove the formulas but keep the values on the Excel worksheet.

Firstly, view the original Excel:

String inputFile = "Sample.xlsx";
String outputFile="output/removeFormulasButKeepValues_result.xlsx";
//Create a workbook.
Workbook workbook = new Workbook();
//Load the file from disk.
workbook.loadFromFile(inputFile);
//Loop through worksheets.
for (Worksheet sheet : (Iterable<? extends Worksheet>) workbook.getWorksheets())
{
    //Loop through cells.
    for (CellRange cell : (Iterable<? extends CellRange>) sheet.getRange())
    {
        //If the cell contains formula, get the formula value, clear cell content, and then fill the formula value into the cell.
        if (cell.hasFormula())
        {
            Object value = cell.getFormulaValue();
            cell.clear(ExcelClearOptions.ClearContent);
            cell.setValue(value.toString());
        }
    }
}
//Save to file
workbook.saveToFile(outputFile, ExcelVersion.Version2013);

Output:

Getting the coordinates of text or images in a PDF helps accurately identify elements, making it easier to extract content. This is especially important for data analysis, where specific information needs to be pulled from complicated layouts. Additionally, knowing these coordinates allows users to add notes, marks, or stamps in the right places, improving document interactivity and collaboration by letting them highlight important sections or add comments exactly where they're needed.

In this article, you will learn how to get coordinates of the specified text or image in a PDF document using Java and Spire.PDF for Java library.

• Get Coordinates of the Specified Text in PDF
• Get Coordinates of the Specified Image in PDF

Install Spire.PDF for Java

First of all, you're required to add the Spire.Pdf.jar file as a dependency in your Java program. The JAR file can be downloaded from this link. If you use Maven, you can easily import the JAR file in your application by adding the following code to your project's pom.xml file.

<repositories>
    <repository>
        <id>com.e-iceblue</id>
        <name>e-iceblue</name>
        <url>https://repo.e-iceblue.com/nexus/content/groups/public/</url>
    </repository>
</repositories>
<dependencies>
    <dependency>
        <groupId>e-iceblue</groupId>
        <artifactId>spire.pdf</artifactId>
        <version>12.10.3</version>
    </dependency>
</dependencies>

Coordinate System in Spire.PDF

When utilizing Spire.PDF for Java to work with an existing PDF document, it's important to note that the coordinate system's origin is positioned at the top-left corner of the page. The x-axis extends to the right, and the y-axis extends downward, as illustrated below.

Get Coordinates of the Specified Text in PDF

To start, you can use the PdfTextFinder.find() method to search for all occurrences of the specified text on the page, which results in a list of PdfTextFragment. After that, you can retrieve the coordinates of the first occurrence of the text using the PdfTextFragment.getPositions() method.

The steps to get coordinates of the specified text in PDF are as follows:

• Create a PdfDocument object.
• Load a PDF file using PdfDocument.loadFromFile() method.
• Get a specific page using PdfDocument.getPages().get() method.
• Search for all occurrences of the specified text on the page using PdfTextFinder.find() method and return results in a list of PdfTextFragment.
• Access a specific PdfTextFragment in the list, and get the coordinates of the fragment using PdfTextFragment.getPositions() method.

import com.spire.pdf.PdfDocument;
import com.spire.pdf.PdfPageBase;
import com.spire.pdf.texts.PdfTextFindOptions;
import com.spire.pdf.texts.PdfTextFinder;
import com.spire.pdf.texts.PdfTextFragment;
import com.spire.pdf.texts.TextFindParameter;

import java.awt.geom.Point2D;
import java.util.EnumSet;
import java.util.List;

public class GetTextCoordinates {

    public static void main(String[] args) {

        // Create a PdfDocument object
        PdfDocument doc = new PdfDocument();

        // Load a PDF file
        doc.loadFromFile("C:\\Users\\Administrator\\Desktop\\Input.pdf");

        // Get a specific page
        PdfPageBase page = doc.getPages().get(0);

        // Create a PdfTextFinder object
        PdfTextFinder finder = new PdfTextFinder(page);

        // Set the find options
        PdfTextFindOptions options = new PdfTextFindOptions();
        options.setTextFindParameter(EnumSet.of(TextFindParameter.IgnoreCase));
        finder.setOptions(options);

        // Find all instances of the text
        List fragments = finder.find("Personal Data");

        // Get a specific text fragment
        PdfTextFragment fragment = (PdfTextFragment)fragments.get(0);


        // Get the positions of the text (If the text spans multiple lines, there will be more than one position)
        Point2D[] positions = fragment.getPositions();

        // Get its first position
        double x = positions[0].getX();
        double y = positions[0].getY();

        // Print result
        System.out.println(String.format("The text is located at: (%f, %f).",x,y));
    }
}

Get Coordinates of the Specified Image in PDF

To begin, you can use the PdfImageHelper.getImagesInfo() method to retrieve information about all images on the specified page, storing the results in an array of PdfImageInfo. Next, you can obtain the X and Y coordinates of a specific image using the PdfImageInfo.getBounds().getX() and PdfImageInfo.getBounds().getY() methods.

The steps to get coordinates of the specified image in PDF are as follows:

• Create a PdfDocument object.
• Load a PDF file using PdfDocument.loadFromFile() method.
• Get a specific page using PdfDocument.getPages().get() method.
• Retrieve all the image information on the page using PdfImageHelper.getImagesInfo() method and return results in an array of PdfImageInfo.
• Get X and Y coordinates of a specific image using PdfImageInfo.getBounds().getX() and PdfImageInfo.getBounds().getY() methods

import com.spire.pdf.PdfDocument;
import com.spire.pdf.PdfPageBase;
import com.spire.pdf.utilities.PdfImageHelper;
import com.spire.pdf.utilities.PdfImageInfo;

public class GetImageCoordinates {

    public static void main(String[] args) {

        // Create a PdfDocument object
        PdfDocument doc = new PdfDocument();

        // Load a PDF file
        doc.loadFromFile("C:\\Users\\Administrator\\Desktop\\Input2.pdf");

        // Get a specific page
        PdfPageBase page = doc.getPages().get(0);

        // Create a PdfImageHelper object
        PdfImageHelper helper = new PdfImageHelper();

        // Get image information from the page
        PdfImageInfo[] imageInfo = helper.getImagesInfo(page);

        // Get X, Y coordinates of the first image
        double x = imageInfo[0].getBounds().getX();
        double y = imageInfo[0].getBounds().getY();

        // Print result
        System.out.println(String.format("The image is located at: (%f, %f).",x,y));
    }
}

Apply for a Temporary License

If you'd like to remove the evaluation message from the generated documents, or to get rid of the function limitations, please request a 30-day trial license for yourself.

PDF annotations are notes or markers added to documents, which are great for making comments, giving explanations, giving feedback, etc. Co-creators of documents often communicate with annotations. However, when the issues associated with the annotations have been dealt with or the document has been finalized, it is necessary to remove the annotations to make the document more concise and professional. This article shows how to delete PDF annotations programmatically using Spire.PDF for Java.

• Remove the Specified Annotation
• Remove All Annotations from a Page
• Remove All Annotations from a PDF Document

Install Spire.PDF for Java

First of all, you're required to add the Spire.Pdf.jar file as a dependency in your Java program. The JAR file can be downloaded from this link. If you use Maven, you can easily import the JAR file in your application by adding the following code to your project's pom.xml file.

<repositories>
    <repository>
        <id>com.e-iceblue</id>
        <name>e-iceblue</name>
        <url>https://repo.e-iceblue.com/nexus/content/groups/public/</url>
    </repository>
</repositories>
<dependencies>
    <dependency>
        <groupId>e-iceblue</groupId>
        <artifactId>spire.pdf</artifactId>
        <version>12.10.3</version>
    </dependency>
</dependencies>

Remove the Specified Annotation

Annotations are page-level document elements. Therefore, deleting an annotation requires getting the page where the annotation is located first, and then you can use the PdfPageBase.getAnnotationsWidget().removeAt() method to delete the annotation. The detailed steps are as follows.

• Create a PdfDocument instance.
• Load a PDF document using PdfDocument.loadFromFile() method.
• Get the first page using PdfDocument.getPages().get() method.
• Remove the first annotation from this page using PdfPageBase.getAnnotationsWidget().removeAt() method.
• Save the document using PdfDocument.saveToFile() method.

import com.spire.pdf.PdfDocument;
import com.spire.pdf.PdfPageBase;

public class RemoveAnnotation {
    public static void main(String[] args) {

        //Create an object of PdfDocument
        PdfDocument pdf = new PdfDocument();

        //Load a PDF document
        pdf.loadFromFile("C:/Annotations.pdf");

        //Get the first page
        PdfPageBase page = pdf.getPages().get(0);

        //Remove the first annotation
        page.getAnnotationsWidget().removeAt(0);

        //Save the document
        pdf.saveToFile("RemoveOneAnnotation.pdf");
    }
}

Remove All Annotations from a Page

Spire.PDF for Java also provides PdfPageBase.getAnnotationsWidget().clear() method to remove all annotations in the specified page. The detailed steps are as follows.

• Create a PdfDocument instance.
• Load a PDF document using PdfDocument.loadFromFile() method.
• Get the first page using PdfDocument.getPages().get() method.
• Remove all annotations from the page using PdfPageBase.getAnnotationsWidget().clear() method.
• Save the document using PdfDocument.saveToFile() method.

import com.spire.pdf.PdfDocument;
import com.spire.pdf.PdfPageBase;

public class RemoveAllAnnotationPage {
    public static void main(String[] args) {

        //Create an object of PdfDocument
        PdfDocument pdf = new PdfDocument();

        //Load a PDF document
        pdf.loadFromFile("C:/Annotations.pdf");

        //Get the first page
        PdfPageBase page = pdf.getPages().get(0);

        //Remove all annotations in the page
        page.getAnnotationsWidget().clear();

        //Save the document
        pdf.saveToFile("RemoveAnnotationsPage.pdf");
    }
}

Remove All Annotations from a PDF Document

To remove all annotations from a PDF document, we need to loop through all pages in the document and delete all annotations from each page. The detailed steps are as follows.

• Create a PdfDocument instance.
• Load a PDF document using PdfDocument.loadFromFile() method.
• Loop through all pages to delete annotations.
• Delete annotations in each page using PdfPageBase.getAnnotationsWidget().clear() method.
• Save the document using PdfDocument.saveToFile() method.

import com.spire.pdf.PdfDocument;
import com.spire.pdf.PdfPageBase;

public class RemoveAllAnnotations {
    public static void main(String[] args) {

        //Create an object of PdfDocument
        PdfDocument pdf = new PdfDocument();

        //Load a PDF document
        pdf.loadFromFile("C:/Users/Sirion/Desktop/Annotations.pdf");

        //Loop through the pages in the document
        for (Object page : (Iterable) pdf.getPages()) {
            PdfPageBase pageBase = (PdfPageBase) page;
            //Remove annotations in each page
            pageBase.getAnnotationsWidget().clear();
        }


        //Save the document
        pdf.saveToFile("RemoveAllAnnotations.pdf");
    }
}

Apply for a Temporary License

If you'd like to remove the evaluation message from the generated documents, or to get rid of the function limitations, please request a 30-day trial license for yourself.