PM> Install-Package Spire.PDF

using Spire.Pdf;
    using Spire.Pdf.Security;
    
    namespace AddInvisibleSignature
    {
        class Program
        {
            static void Main(string[] args)
            {
                //Create a PdfDocument object
                PdfDocument doc = new PdfDocument();
    
                //Load a sample PDF file
                doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf");
    
                //Load the certificate
                PdfCertificate cert = new PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx", "e-iceblue");
    
                //Create a PdfSignature object
                PdfSignature signature = new PdfSignature(doc, doc.Pages[doc.Pages.Count - 1], cert, "MySignature");
    
                //Set the document permission to forbid changes but allow form fill
                signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill;
    
                //Save to another PDF file
                doc.SaveToFile("InvisibleSignature.pdf");
                doc.Close();
            }
        }
    }

Imports Spire.Pdf
    Imports Spire.Pdf.Security
    
    Namespace AddInvisibleSignature
        Class Program
            Shared  Sub Main(ByVal args() As String)
                'Create a PdfDocument object
                Dim doc As PdfDocument =  New PdfDocument()
    
                'Load a sample PDF file
                doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf")
    
                'Load the certificate
                Dim cert As PdfCertificate =  New PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx","e-iceblue")
    
                'Create a PdfSignature object
                Dim signature As PdfSignature =  New PdfSignature(doc,doc.Pages(doc.Pages.Count - 1),cert,"MySignature")
    
                'Set the document permission to forbid changes but allow form fill
                signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill
    
                'Save to another PDF file
                doc.SaveToFile("InvisibleSignature.pdf")
                doc.Close()
            End Sub
        End Class
    End Namespace

using System;
    using System.Drawing;
    using Spire.Pdf;
    using Spire.Pdf.Security;
    using Spire.Pdf.Graphics;
    
    namespace AddVisibleSignature
    {
        class Program
        {
            static void Main(string[] args)
            {
                //Create a PdfDocument object
                PdfDocument doc = new PdfDocument();
    
                //Load a sample PDF file
                doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf");
    
                //Load the certificate
                PdfCertificate cert = new PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx", "e-iceblue");
    
                //Create a PdfSignature object and specify its position and size
                PdfSignature signature = new PdfSignature(doc, doc.Pages[doc.Pages.Count - 1], cert, "MySignature");
                RectangleF rectangleF = new RectangleF(doc.Pages[0].ActualSize.Width - 260 - 54 , 200, 260, 110);
                signature.Bounds = rectangleF;
                signature.Certificated = true;
    
                //Set the graphics mode to ImageAndSignDetail
                signature.GraphicsMode = GraphicMode.SignImageAndSignDetail;
    
                //Set the signature content
                signature.NameLabel = "Signer:";
                signature.Name = "Gary";
                signature.ContactInfoLabel = "Phone:";
                signature.ContactInfo = "0123456";
                signature.DateLabel = "Date:";
                signature.Date = DateTime.Now;
                signature.LocationInfoLabel = "Location:";
                signature.LocationInfo = "USA";
                signature.ReasonLabel = "Reason:";
                signature.Reason = "I am the author";
                signature.DistinguishedNameLabel = "DN:";
                signature.DistinguishedName = signature.Certificate.IssuerName.Name;
    
                //Set the signature image source
                signature.SignImageSource = PdfImage.FromFile("C:\\Users\\Administrator\\Desktop\\handwrittingSignature.png");
    
                //Set the signature font
                signature.SignDetailsFont = new PdfTrueTypeFont(new Font("Arial Unicode MS", 12f, FontStyle.Regular));
    
                //Set the document permission to forbid changes but allow form fill
                signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill;
    
                //Save to file
                doc.SaveToFile("VisiableSignature.pdf");
                doc.Close();
            }
        }
    }

Imports System
    Imports System.Drawing
    Imports Spire.Pdf
    Imports Spire.Pdf.Security
    Imports Spire.Pdf.Graphics
    
    Namespace AddVisibleSignature
        Class Program
            Shared  Sub Main(ByVal args() As String)
                'Create a PdfDocument object
                Dim doc As PdfDocument =  New PdfDocument()
    
                'Load a sample PDF file
                doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\sample.pdf")
    
                'Load the certificate
                Dim cert As PdfCertificate =  New PdfCertificate("C:\\Users\\Administrator\\Desktop\\MyCertificate.pfx","e-iceblue")
    
                'Create a PdfSignature object and specify its position and size
                Dim signature As PdfSignature =  New PdfSignature(doc,doc.Pages(doc.Pages.Count - 1),cert,"MySignature")
                Dim rectangleF As RectangleF =  New RectangleF(doc.Pages(0).ActualSize.Width - 260 - 54,200,260,110)
                signature.Bounds = rectangleF
                signature.Certificated = True
    
                'Set the graphics mode to ImageAndSignDetail
                signature.GraphicsMode = GraphicMode.SignImageAndSignDetail
    
                'Set the signature content
                signature.NameLabel = "Signer:"
                signature.Name = "Gary"
                signature.ContactInfoLabel = "Phone:"
                signature.ContactInfo = "0123456"
                signature.DateLabel = "Date:"
                signature.Date = DateTime.Now
                signature.LocationInfoLabel = "Location:"
                signature.LocationInfo = "USA"
                signature.ReasonLabel = "Reason:"
                signature.Reason = "I am the author"
                signature.DistinguishedNameLabel = "DN:"
                signature.DistinguishedName = signature.Certificate.IssuerName.Name
    
                'Set the signature image source
                signature.SignImageSource = PdfImage.FromFile("C:\\Users\\Administrator\\Desktop\\handwrittingSignature.png")
    
                'Set the signature font
                signature.SignDetailsFont = New PdfTrueTypeFont(New Font("Arial Unicode MS", 12f, FontStyle.Regular))
    
                'Set the document permission to forbid changes but allow form fill
                signature.DocumentPermissions = PdfCertificationFlags.ForbidChanges | PdfCertificationFlags.AllowFormFill
    
                'Save to file
                doc.SaveToFile("VisiableSignature.pdf")
                doc.Close()
            End Sub
        End Class
    End Namespace

using Spire.Pdf;
    using Spire.Pdf.Widget;
    
    namespace RemoveSignature
    {
        class Program
        {
            static void Main(string[] args)
            {
                //Create a PdfDocument object
                PdfDocument doc = new PdfDocument("C:\\Users\\Administrator\\Desktop\\VisiableSignature.pdf");
    
                //Get form widgets from the document
                PdfFormWidget widgets = doc.Form as PdfFormWidget;
    
                //Loop through the widgets
                for (int i = 0; i < widgets.FieldsWidget.List.Count; i++)
                {
                    //Get the specific widget
                    PdfFieldWidget widget = widgets.FieldsWidget.List[i] as PdfFieldWidget;
    
                    //Determine if the widget is a PdfSignatureFieldWidget
                    if (widget is PdfSignatureFieldWidget)
                    {
                        //Remove the widget
                        widgets.FieldsWidget.RemoveAt(i);
                    }
                }
    
                //Save the document to another PDF file
                doc.SaveToFile("RemoveSignatures.pdf");
            }
        }
    }

Imports Spire.Pdf
    Imports Spire.Pdf.Widget
    
    Namespace RemoveSignature
        Class Program
            Shared  Sub Main(ByVal args() As String)
                'Create a PdfDocument object
                Dim doc As PdfDocument =  New PdfDocument("C:\\Users\\Administrator\\Desktop\\VisiableSignature.pdf")
    
                'Get form widgets from the document
                Dim widgets As PdfFormWidget =  doc.Form as PdfFormWidget
    
                'Loop through the widgets
                Dim i As Integer
                For  i = 0 To  widgets.FieldsWidget.List.Count- 1  Step  i + 1
                    'Get the specific widget
                    Dim widget As PdfFieldWidget =  widgets.FieldsWidget.List(i) as PdfFieldWidget
    
                    'Determine if the widget is a PdfSignatureFieldWidget
                    If TypeOf widget Is PdfSignatureFieldWidget Then
                        'Remove the widget
                        widgets.FieldsWidget.RemoveAt(i)
                    End If
                Next
    
                'Save the document to another PDF file
                doc.SaveToFile("RemoveSignatures.pdf")
            End Sub
        End Class
    End Namespace

PM> Install-Package Spire.PDF

using Spire.Pdf;
    using Spire.Pdf.Graphics;
    using System.Drawing;
    
    namespace ConvertMultipleImagesIntoPdf
    {
        class Program
        {
            static void Main(string[] args)
            {
                //Create a PdfDocument object
                PdfDocument doc = new PdfDocument();
    
                //Set the page margins to 0
                doc.PageSettings.SetMargins(0);
    
                //Get the folder where the images are stored
                DirectoryInfo folder = new DirectoryInfo(@"C:\Users\Administrator\Desktop\Images");
    
                //Iterate through the files in the folder
                foreach (FileInfo file in folder.GetFiles())
                {
                    //Load a particular image
                    Image image = Image.FromFile(file.FullName);
    
                    //Get the image width and height
                    float width = image.PhysicalDimension.Width;
                    float height = image.PhysicalDimension.Height;
    
                    //Add a page that has the same size as the image
                    PdfPageBase page = doc.Pages.Add(new SizeF(width, height));
    
                    //Create a PdfImage object based on the image
                    PdfImage pdfImage = PdfImage.FromImage(image);
    
                    //Draw image at (0, 0) of the page
                    page.Canvas.DrawImage(pdfImage, 0, 0, pdfImage.Width, pdfImage.Height);
                }
    
                //Save to file
                doc.SaveToFile("CombinaImagesToPdf.pdf");
                doc.Dispose();
            }
        }
    }

Imports Spire.Pdf
    Imports Spire.Pdf.Graphics
    Imports System.Drawing
    
    Namespace ConvertMultipleImagesIntoPdf
        Class Program
            Shared  Sub Main(ByVal args() As String)
                'Create a PdfDocument object
                Dim doc As PdfDocument =  New PdfDocument()
    
                'Set the page margins to 0
                doc.PageSettings.SetMargins(0)
    
                'Get the folder where the images are stored
                Dim folder As DirectoryInfo =  New DirectoryInfo("C:\Users\Administrator\Desktop\Images")
    
                'Iterate through the files in the folder
                Dim file As FileInfo
                For Each file In folder.GetFiles()
                    'Load a particular image
                    Dim image As Image =  Image.FromFile(file.FullName)
    
                    'Get the image width and height
                    Dim width As single =  image.PhysicalDimension.Width
                    Dim height As single =  image.PhysicalDimension.Height
    
                    'Add a page that has the same size as the image
                    Dim page As PdfPageBase =  doc.Pages.Add(New SizeF(width,height))
    
                    'Create a PdfImage object based on the image
                    Dim pdfImage As PdfImage =  PdfImage.FromImage(image)
    
                    'Draw image at (0, 0) of the page
                    page.Canvas.DrawImage(pdfImage, 0, 0, pdfImage.Width, pdfImage.Height)
                Next
    
                'Save to file
                doc.SaveToFile("CombinaImagesToPdf.pdf")
                doc.Dispose()
            End Sub
        End Class
    End Namespace

PM> Install-Package Spire.PDF

using Spire.Pdf;
    
    namespace ConvertPDFtoSVG
    {
        class Program
        {
            static void Main(string[] args)
            {
                //Create a PdfDocument object
                PdfDocument document = new PdfDocument();
    
                //Load a sample PDF file
                document.LoadFromFile("input.pdf");
    
                //Convert PDF to SVG
                document.SaveToFile("PDFtoSVG.svg", FileFormat.SVG);
            }
        }
    }

Imports Spire.Pdf
    
    Namespace ConvertPDFtoSVG
        Class Program
            Private Shared Sub Main(ByVal args As String())
    
                'Create a PdfDocument object
                Dim document As PdfDocument = New PdfDocument()
    
                'Load a sample PDF file
                document.LoadFromFile("input.pdf")
    
                'Convert PDF to SVG
                document.SaveToFile("PDFtoSVG.svg", FileFormat.SVG)
            End Sub
        End Class
    End Namespace

using Spire.Pdf;
    
    namespace PDFPagetoSVG
    {
        class Program
        {
            static void Main(string[] args)
            {
                //Create a PdfDocument object
                PdfDocument doc = new PdfDocument();
    
                //Load a sample PDF file
                doc.LoadFromFile("input.pdf");
    
                //Convert selected PDF pages to SVG
                doc.SaveToFile("PDFPagetoSVG.svg", 1, 2, FileFormat.SVG);
            }
        }
    }

Imports Spire.Pdf
    
    Namespace PDFPagetoSVG
        Class Program
            Private Shared Sub Main(ByVal args As String())
    
                'Create a PdfDocument object
                Dim doc As PdfDocument = New PdfDocument()
    
                'Load a sample PDF file
                doc.LoadFromFile("input.pdf")
    
                'Convert selected PDF pages to SVG
                doc.SaveToFile("PDFPagetoSVG.svg", 1, 2, FileFormat.SVG)
            End Sub
        End Class
    End Namespace

using Spire.Pdf;
    
    namespace PDFtoSVG
    {
        class Program
        {
            static void Main(string[] args)
            {
                //Create a PdfDocument object
                PdfDocument document = new PdfDocument();
    
                //Load a sample PDF file
                document.LoadFromFile("input.pdf");
    
                //Specify the width and height of output SVG file
                document.ConvertOptions.SetPdfToSvgOptions(800f, 1200f);
    
                //Convert PDF to SVG
                document.SaveToFile("result.svg", FileFormat.SVG);
            }
        }
    }

Imports Spire.Pdf
    
    Namespace PDFtoSVG
        Class Program
            Private Shared Sub Main(ByVal args As String())
    
                'Create a PdfDocument object
                Dim document As PdfDocument = New PdfDocument()
    
                'Load a sample PDF file
                document.LoadFromFile("input.pdf")
    
                'Specify the width and height of output SVG file
                document.ConvertOptions.SetPdfToSvgOptions(800.0F, 1200.0F)
    
                'Convert PDF to SVG
                document.SaveToFile("result.svg", FileFormat.SVG)
            End Sub
        End Class
    End Namespace

PM> Install-Package Spire.PDF

using Spire.Pdf;
    using Spire.Pdf.Texts;
    using System.Collections.Generic;
    using System.Drawing;
    
    namespace HighlightTextInPdf
    {
        internal class Program
        {
            static void Main(string[] args)
            {
                //Create a PdfDocument instance
                PdfDocument pdf = new PdfDocument();
                //Load a PDF file
                pdf.LoadFromFile("Sample.pdf");
    
                //Creare a PdfTextFindOptions instance
                PdfTextFindOptions findOptions = new PdfTextFindOptions();
                //Specify the text finding parameter
                findOptions.Parameter = TextFindParameter.WholeWord;
    
                //Loop through the pages in the PDF file
                foreach (PdfPageBase page in pdf.Pages)
                {
                    //Create a PdfTextFinder instance
                    PdfTextFinder finder = new PdfTextFinder(page);
                    //Set the text finding option
                    finder.Options = findOptions;
                    //Find a specific text
                    List<PdfTextFragment> results = finder.Find("Video");
                    //Highlight all occurrences of the specific text
                    foreach (PdfTextFragment text in results)
                    {
                        text.HighLight(Color.Green);
                    }
                }
    
                //Save the result file
                pdf.SaveToFile("HighlightText.pdf");
            }
        }
    }

Imports Spire.Pdf
    Imports Spire.Pdf.Texts
    Imports System.Collections.Generic
    Imports System.Drawing
    
    Namespace HighlightTextInPdf
        Friend Class Program
            Private Shared Sub Main(ByVal args As String())
                'Create a PdfDocument instance
                Dim pdf As PdfDocument = New PdfDocument()
                'Load a PDF file
                pdf.LoadFromFile("Sample.pdf")
    
                'Creare a PdfTextFindOptions instance
                Dim findOptions As PdfTextFindOptions = New PdfTextFindOptions()
                'Specify the text finding parameter
                findOptions.Parameter = TextFindParameter.WholeWord
    
                'Loop through the pages in the PDF file
                For Each page As PdfPageBase In pdf.Pages
                    'Create a PdfTextFinder instance
                    Dim finder As PdfTextFinder = New PdfTextFinder(page)
                    'Set the text finding option
                    finder.Options = findOptions
                    'Find a specific text
                    Dim results As List(Of PdfTextFragment) = finder.Find("Video")
                    'Highlight all occurrences of the specific text
                    For Each text As PdfTextFragment In results
                        text.HighLight(Color.Green)
                    Next
                Next
    
                'Save the result file
                pdf.SaveToFile("HighlightText.pdf")
            End Sub
        End Class
    End Namespace

PM> Install-Package Spire.PDF

using Spire.Pdf;
    using System.Drawing;
    
    namespace ExtractImages
    {
        class Program
        {
            static void Main(string[] args)
            {
                //Create a PdfDocument instance
                PdfDocument pdf = new PdfDocument();
                //Load a PDF document
                pdf.LoadFromFile("Input.pdf");
    
                int i = 1;
                //Loop through all pages in the document
                foreach (PdfPageBase page in pdf.Pages)
                {
                    //Extract images from each page and save them to a specified file path
                    foreach (Image image in page.ExtractImages())
                    {
                        image.Save(@"C:/Users/Administrator/Desktop/Images/" + "image" + i + ".png", System.Drawing.Imaging.ImageFormat.Png);
                        i++;
                    }
                }
            }
        }
    }

Imports Spire.Pdf
    
    Namespace ExtractImages
        Friend Class Program
            Private Shared Sub Main(ByVal args As String())
                'Create a PdfDocument instance
                Dim pdf As PdfDocument = New PdfDocument()
                'Load a PDF document
                pdf.LoadFromFile("Input.pdf")
    
                Dim i = 1
                'Loop through all pages in the document
                For Each page As PdfPageBase In pdf.Pages
                    'Extract images from each page and save them to a specified file path
                    For Each image As Image In page.ExtractImages()
                        image.Save("C:/Users/Administrator/Desktop/Images/" & "image" & i & ".png", Drawing.Imaging.ImageFormat.Png)
                        i += 1
                    Next
                Next
            End Sub
        End Class
    End Namespace

PM> Install-Package Spire.PDF

using System;
    using System.IO;
    using Spire.Pdf;
    using Spire.Pdf.Texts;
    
    namespace ExtractTextFromPage
    {
        class Program
        {
            static void Main(string[] args)
            {
                //Create a PdfDocument object
                PdfDocument doc = new PdfDocument();
    
                //Load a PDF file
                doc.LoadFromFile(@"C:\Users\Administrator\Desktop\Terms of Service.pdf");
    
                //Get the second page
                PdfPageBase page = doc.Pages[1];
    
                //Create a PdfTextExtractot object
                PdfTextExtractor textExtractor = new PdfTextExtractor(page);
    
                //Create a PdfTextExtractOptions object
                PdfTextExtractOptions extractOptions = new PdfTextExtractOptions();
    
                //Set isExtractAllText to true
                extractOptions.IsExtractAllText = true;
    
                //Extract text from the page
                string text = textExtractor.ExtractText(extractOptions);
    
                //Write to a txt file
                File.WriteAllText("Extracted.txt", text);
            }
        }
    }

Imports System
    Imports System.IO
    Imports Spire.Pdf
    Imports Spire.Pdf.Texts
    
    Namespace ExtractTextFromPage
        Class Program
            Shared  Sub Main(ByVal args() As String)
                'Create a PdfDocument object
                Dim doc As PdfDocument =  New PdfDocument()
    
                'Load a PDF file
                doc.LoadFromFile("C:\Users\Administrator\Desktop\Terms of Service.pdf")
    
                'Get the second page
                Dim page As PdfPageBase =  doc.Pages(1)
    
                'Create a PdfTextExtractot object
                Dim textExtractor As PdfTextExtractor =  New PdfTextExtractor(page)
    
                'Create a PdfTextExtractOptions object
                Dim extractOptions As PdfTextExtractOptions =  New PdfTextExtractOptions()
    
                'Set isExtractAllText to true
                extractOptions.IsExtractAllText = True
    
                'Extract text from the page
                Dim text As String =  textExtractor.ExtractText(extractOptions)
    
                'Write to a txt file
                File.WriteAllText("Extracted.txt", text)
            End Sub
        End Class
    End Namespace

using Spire.Pdf;
    using Spire.Pdf.Texts;
    using System.IO;
    using System.Drawing;
    
    namespace ExtractTextFromRectangleArea
    {
        class Program
        {
            static void Main(string[] args)
            {
                //Create a PdfDocument object
                PdfDocument doc = new PdfDocument();
    
                //Load a PDF file
                doc.LoadFromFile(@"C:\Users\Administrator\Desktop\Terms of Service.pdf");
    
                //Get the second page
                PdfPageBase page = doc.Pages[1];
    
                //Create a PdfTextExtractot object
                PdfTextExtractor textExtractor = new PdfTextExtractor(page);
    
                //Create a PdfTextExtractOptions object
                PdfTextExtractOptions extractOptions = new PdfTextExtractOptions();
    
                //Set the rectangle area
                extractOptions.ExtractArea = new RectangleF(0, 0, 890, 170);
    
                //Extract text from the rectangle
                string text = textExtractor.ExtractText(extractOptions);
    
                //Write to a txt file
                File.WriteAllText("Extracted.txt", text);
            }
        }
    }

Imports Spire.Pdf
    Imports Spire.Pdf.Texts
    Imports System.IO
    Imports System.Drawing
    
    Namespace ExtractTextFromRectangleArea
        Class Program
            Shared  Sub Main(ByVal args() As String)
                'Create a PdfDocument object
                Dim doc As PdfDocument =  New PdfDocument()
    
                'Load a PDF file
                doc.LoadFromFile("C:\Users\Administrator\Desktop\Terms of Service.pdf")
    
                'Get the second page
                Dim page As PdfPageBase =  doc.Pages(1)
    
                'Create a PdfTextExtractot object
                Dim textExtractor As PdfTextExtractor =  New PdfTextExtractor(page)
    
                'Create a PdfTextExtractOptions object
                Dim extractOptions As PdfTextExtractOptions =  New PdfTextExtractOptions()
    
                'Set the rectangle area
                extractOptions.ExtractArea = New RectangleF(0, 0, 890, 170)
    
                'Extract text from the rectangle
                Dim text As String =  textExtractor.ExtractText(extractOptions)
    
                'Write to a txt file
                File.WriteAllText("Extracted.txt", text)
            End Sub
        End Class
    End Namespace

using System.IO;
    using Spire.Pdf;
    using Spire.Pdf.Texts;
    
    namespace SimpleExtraction
    {
        class Program
        {
            static void Main(string[] args)
            {
                //Create a PdfDocument object
                PdfDocument doc = new PdfDocument();
    
                //Load a PDF file
                doc.LoadFromFile(@"C:\Users\Administrator\Desktop\Invoice.pdf");
    
                //Get the first page
                PdfPageBase page = doc.Pages[0];
    
                //Create a PdfTextExtractor object
                PdfTextExtractor textExtractor = new PdfTextExtractor(page);
    
                //Create a PdfTextExtractOptions object
                PdfTextExtractOptions extractOptions = new PdfTextExtractOptions();
    
                //Set IsSimpleExtraction to true
                extractOptions.IsSimpleExtraction = true;
    
                //Extract text from the selected page
                string text = textExtractor.ExtractText(extractOptions);
    
                //Write to a txt file
                File.WriteAllText("Extracted.txt", text);
            }
        }
    }

Imports System.IO
    Imports Spire.Pdf
    Imports Spire.Pdf.Texts
    
    Namespace SimpleExtraction
        Class Program
            Shared  Sub Main(ByVal args() As String)
                'Create a PdfDocument object
                Dim doc As PdfDocument =  New PdfDocument()
    
                'Load a PDF file
                doc.LoadFromFile("C:\Users\Administrator\Desktop\Invoice.pdf")
    
                'Get the first page
                Dim page As PdfPageBase =  doc.Pages(0)
    
                'Create a PdfTextExtractor object
                Dim textExtractor As PdfTextExtractor =  New PdfTextExtractor(page)
    
                'Create a PdfTextExtractOptions object
                Dim extractOptions As PdfTextExtractOptions =  New PdfTextExtractOptions()
    
                'Set IsSimpleExtraction to true
                extractOptions.IsSimpleExtraction = True
    
                'Extract text from the selected page
                Dim text As String =  textExtractor.ExtractText(extractOptions)
    
                'Write to a txt file
                File.WriteAllText("Extracted.txt", text)
            End Sub
        End Class
    End Namespace

PM> Install-Package Spire.PDF

using Spire.Pdf;
    using Spire.Pdf.Graphics;
    
    namespace InsertImage
    {
        class Program
        {
            static void Main(string[] args)
            {
                //Create a PdfDocument instance
                PdfDocument pdf = new PdfDocument();
                pdf.LoadFromFile("Input.pdf");
    
                //Get the first page in the PDF document
                PdfPageBase page = pdf.Pages[0];
    
                //Load an image
                PdfImage image = PdfImage.FromFile("image.jpg");
    
                //Specify the width and height of the image area on the page
                float width = image.Width * 0.50f;
                float height = image.Height * 0.50f;
    
                //Specify the X and Y coordinates to start drawing the image
                float x = 180f;
                float y = 70f;
    
                //Draw the image at a specified location on the page
                page.Canvas.DrawImage(image, x, y, width, height);
    
                //Save the result document
                pdf.SaveToFile("AddImage.pdf", FileFormat.PDF);
            }
        }
    }

Imports Spire.Pdf
    Imports Spire.Pdf.Graphics
    
    Namespace InsertImage
        Friend Class Program
            Private Shared Sub Main(ByVal args As String())
                'Create a PdfDocument instance
                Dim pdf As PdfDocument = New PdfDocument()
                pdf.LoadFromFile("Input.pdf")
    
                'Get the first page in the PDF document
                Dim page As PdfPageBase = pdf.Pages(0)
    
                'Load an image
                Dim image As PdfImage = PdfImage.FromFile("image.jpg")
    
                'Specify the width and height of the image area on the page
                Dim width As Single = image.Width * 0.50F
                Dim height As Single = image.Height * 0.50F
    
                'Specify the X and Y coordinates to start drawing the image
                Dim x = 180F
                Dim y = 70F
    
                'Draw the image at a specified location on the page
                page.Canvas.DrawImage(image, x, y, width, height)
    
                'Save the result document
                pdf.SaveToFile("AddImage.pdf", FileFormat.PDF)
            End Sub
        End Class
    End Namespace

using Spire.Pdf;
    using Spire.Pdf.Graphics;
    using Spire.Pdf.Utilities;
    
    namespace ReplaceImage
    {
        class Program
        {
            static void Main(string[] args)
            {
                //Create a PdfDocument instance
                PdfDocument doc = new PdfDocument();
                //Load a PDF document
                doc.LoadFromFile("AddImage.pdf");
    
                //Get the first page
                PdfPageBase page = doc.Pages[0];
    
                //Load an image
                PdfImage image = PdfImage.FromFile("image1.jpg");
    
                //Create a PdfImageHelper instance
                PdfImageHelper imageHelper = new PdfImageHelper();
                //Get the image information from the page
                PdfImageInfo[] imageInfo = imageHelper.GetImagesInfo(page);
                //Replace the first image on the page with the loaded image
                imageHelper.ReplaceImage(imageInfo[0], image);
    
                //Save the result document
                doc.SaveToFile("ReplaceImage.pdf", FileFormat.PDF);
            }
        }
    }

Imports Spire.Pdf
    Imports Spire.Pdf.Graphics
    Imports Spire.Pdf.Utilities
    
    Namespace ReplaceImage
        Friend Class Program
            Private Shared Sub Main(ByVal args As String())
                'Create a PdfDocument instance
                Dim doc As PdfDocument = New PdfDocument()
                'Load a PDF document
                doc.LoadFromFile("AddImage.pdf")
    
                'Get the first page
                Dim page As PdfPageBase = doc.Pages(0)
    
                'Load an image
                Dim image As PdfImage = PdfImage.FromFile("image1.jpg")
    
                'Create a PdfImageHelper instance
                Dim imageHelper As PdfImageHelper = New PdfImageHelper()
                'Get the image information from the page
                Dim imageInfo As PdfImageInfo() = imageHelper.GetImagesInfo(page)
                'Replace the first image on the page with the loaded image
                imageHelper.ReplaceImage(imageInfo(0), image)
    
                'Save the result document
                doc.SaveToFile("ReplaceImage.pdf", FileFormat.PDF)
            End Sub
        End Class
    End Namespace

using Spire.Pdf;
    
    namespace DeleteImage
    {
        class Program
        {
            static void Main(string[] args)
            {
                //Create a PdfDocument instance
                PdfDocument pdf = new PdfDocument();
                //Load a PDF document
                pdf.LoadFromFile("AddImage.pdf");
    
                //Get the first page
                PdfPageBase page = pdf.Pages[0];
    
                //Delete the first image on the page
                page.DeleteImage(0);
    
                //Save the result document
                pdf.SaveToFile("DeleteImage.pdf", FileFormat.PDF);
            }
        }
    }

Imports Spire.Pdf
    
    Namespace DeleteImage
        Friend Class Program
            Private Shared Sub Main(ByVal args As String())
                'Create a PdfDocument instance
                Dim pdf As PdfDocument = New PdfDocument()
                'Load a PDF document
                pdf.LoadFromFile("AddImage.pdf")
    
                'Get the first page
                Dim page As PdfPageBase = pdf.Pages(0)
    
                'Delete the first image on the page
                page.DeleteImage(0)
    
                'Save the result document
                pdf.SaveToFile("DeleteImage.pdf", FileFormat.PDF)
            End Sub
        End Class
    End Namespace