Replace Text - Facades

Replace Text in an Existing PDF File

In order to replace text in an existing PDF file, you need to create an object of PdfContentEditor class and bind an input PDF file using BindPdf method. After that, you need to call ReplaceText method. You need to save the updated PDF file using Save method of PdfContentEditor class. The following code snippet shows you how to replace text in an existing PDF file.

.NET Core 3.1

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET

public static void ReplaceText01()
{
    // The path to the documents directory
    string dataDir = RunExamples.GetDataDir_AsposePdf_WorkingDocuments();

    // Instantiate PdfContentEditor object
    using (var editor = new Aspose.Pdf.Facades.PdfContentEditor())
    {
        editor.BindPdf(dataDir + "sample.pdf");
        editor.ReplaceText("Value", "Label");

        // Save the output file
        editor.Save(dataDir + "PdfContentEditorDemo01.pdf");
    }
}

.NET 8

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET

public static void ReplaceText01()
{
    // The path to the documents directory
    string dataDir = RunExamples.GetDataDir_AsposePdf_WorkingDocuments();

    // Instantiate PdfContentEditor Object
    using var editor = new Aspose.Pdf.Facades.PdfContentEditor();
    editor.BindPdf(dataDir + "sample.pdf");
    editor.ReplaceText("Value", "Label");

    // Save the output file
    editor.Save(dataDir + "PdfContentEditorDemo01.pdf");
}

Check how it’s looks in the original document:

And check the result after replacing the text:

In the second example, you will see how, in addition to replacing the text, you can also increase or decrease the font size:

.NET Core 3.1

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET

public static void ReplaceText02()
{
    // The path to the documents directory
    string dataDir = RunExamples.GetDataDir_AsposePdf_WorkingDocuments();

    // Instantiate PdfContentEditor object
    using (var editor = new Aspose.Pdf.Facades.PdfContentEditor())
    {
        editor.BindPdf(dataDir + "sample.pdf");
        editor.ReplaceText("Value", "Label", 12);

        // save the output file
        editor.Save(dataDir + "PdfContentEditorDemo02.pdf");
    }
}

.NET 8

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET

public static void ReplaceText02()
{
    // The path to the documents directory
    string dataDir = RunExamples.GetDataDir_AsposePdf_WorkingDocuments();

    // Instantiate PdfContentEditor object
    using var editor = new Aspose.Pdf.Facades.PdfContentEditor();
    editor.BindPdf(dataDir + "sample.pdf");
    editor.ReplaceText("Value", "Label", 12);

    // save the output file
    editor.Save(dataDir + "PdfContentEditorDemo02.pdf");
}

For more advanced possibilities for working with our text, we will use the TextState method. With this method, we can make text bold, italic, colored, and so on.

.NET Core 3.1

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET

public static void ReplaceText03()
{
    // The path to the documents directory
    string dataDir = RunExamples.GetDataDir_AsposePdf_WorkingDocuments();

    // Instantiate PdfContentEditor object
    using (var editor = new Aspose.Pdf.Facades.PdfContentEditor())
    {
        editor.BindPdf(dataDir + "sample.pdf");

        var textState = new Aspose.Pdf.Text.TextState
        {
            ForegroundColor = Aspose.Pdf.Color.Red,
            FontSize = 12,
        };

        editor.ReplaceText("Value", "Label", textState);

        // save the output file
        editor.Save(dataDir + "PdfContentEditorDemo03.pdf");
    }
}

.NET 8

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET

public static void ReplaceText03()
{
    // The path to the documents directory
    string dataDir = RunExamples.GetDataDir_AsposePdf_WorkingDocuments();

    // Instantiate PdfContentEditor object
    using var editor = new Aspose.Pdf.Facades.PdfContentEditor();
    editor.BindPdf(dataDir + "sample.pdf");

    var textState = new Aspose.Pdf.Text.TextState
    {
        ForegroundColor = Aspose.Pdf.Color.Red,
        FontSize = 12,
    };

    editor.ReplaceText("Value", "Label", textState);

    // save the output file
    editor.Save(dataDir + "PdfContentEditorDemo03.pdf");
}

In case you need to replace all the specified text in the document, use the following code snippet. That is, the replacement of the text will take place wherever the text specified for replacement will be encountered, and it will also count the number of such replacements.

.NET Core 3.1

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET

public static void ReplaceText04()
{
    // The path to the documents directory
    string dataDir = RunExamples.GetDataDir_AsposePdf_WorkingDocuments();

    // Instantiate PdfContentEditor object
    using (var editor = new Aspose.Pdf.Facades.PdfContentEditor())
    {
        editor.BindPdf(dataDir + "sample.pdf");
        int count = 0;

        while (editor.ReplaceText("Value", "Label"))
        {
            count++;
        }

        Console.WriteLine($"{count} occurrences have been replaced.");

        // Save the output file
        editor.Save(dataDir + "PdfContentEditorDemo04.pdf");
    }
}

.NET 8

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET

public static void ReplaceText04()
{
    // The path to the documents directory
    string dataDir = RunExamples.GetDataDir_AsposePdf_WorkingDocuments();

    // Instantiate PdfContentEditor object
    using var editor = new Aspose.Pdf.Facades.PdfContentEditor();
    editor.BindPdf(dataDir + "sample.pdf");
    int count = 0;

    while (editor.ReplaceText("Value", "Label"))
    {
        count++;
    }

    Console.WriteLine($"{count} occurrences have been replaced.");

    // Save the output file
    editor.Save(dataDir + "PdfContentEditorDemo04.pdf");
}

The following code snippet shows how to make all the text replacements but on a specific page of your document.

.NET Core 3.1

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET

public static void ReplaceText05()
{
    // The path to the documents directory
    string dataDir = RunExamples.GetDataDir_AsposePdf_WorkingDocuments();

    // Instantiate PdfContentEditor object
    using (var editor = new Aspose.Pdf.Facades.PdfContentEditor())
    {
        editor.BindPdf(dataDir + "sample.pdf");
        int count = 0;

        while (editor.ReplaceText("9999", 2, "ABCDE"))
        {
            count++;
        }

        Console.WriteLine($"{count} occurrences have been replaced.");

        // Save the output file
        editor.Save(dataDir + "PdfContentEditorDemo05.pdf");
    }
}

.NET 8

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET

public static void ReplaceText05()
{
    // The path to the documents directory
    string dataDir = RunExamples.GetDataDir_AsposePdf_WorkingDocuments();

    // Instantiate PdfContentEditor object
    using var editor = new Aspose.Pdf.Facades.PdfContentEditor();
    editor.BindPdf(dataDir + "sample.pdf");
    int count = 0;

    while (editor.ReplaceText("9999", 2, "ABCDE"))
    {
        count++;
    }

    Console.WriteLine($"{count} occurrences have been replaced.");

    // Save the output file
    editor.Save(dataDir + "PdfContentEditorDemo05.pdf");
}

In the next code snippet, we will show how to replace, for example, a given number with the letters we need.

.NET Core 3.1

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET

public static void ReplaceText06()
{
    // The path to the documents directory
    string dataDir = RunExamples.GetDataDir_AsposePdf_WorkingDocuments();

    // Instantiate PdfContentEditor object
    using (var editor = new Aspose.Pdf.Facades.PdfContentEditor
           {
               ReplaceTextStrategy = new Aspose.Pdf.Facades.ReplaceTextStrategy
               {
                   IsRegularExpressionUsed = true,
                   ReplaceScope = Aspose.Pdf.Facades.ReplaceTextStrategy.Scope.ReplaceAll
               }
           })
    {
        editor.BindPdf(dataDir + "sample.pdf");
        editor.ReplaceText("\\d{4}", "ABCDE");

        // Save the output file
        editor.Save(dataDir + "PdfContentEditorDemo06.pdf");
    }
}

.NET 8

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET

public static void ReplaceText06()
{
    // The path to the documents directory
    string dataDir = RunExamples.GetDataDir_AsposePdf_WorkingDocuments();

    // Instantiate PdfContentEditor object
    using var editor = new Aspose.Pdf.Facades.PdfContentEditor
    {
        ReplaceTextStrategy = new Aspose.Pdf.Facades.ReplaceTextStrategy
        {
            IsRegularExpressionUsed = true,
            ReplaceScope = Aspose.Pdf.Facades.ReplaceTextStrategy.Scope.ReplaceAll
        }
    };

    editor.BindPdf(dataDir + "sample.pdf");
    editor.ReplaceText("\\d{4}", "ABCDE");

    // Save the output file
    editor.Save(dataDir + "PdfContentEditorDemo06.pdf");
}