Aspose.PDF ReplaceText method

AsposePDFReplaceText.cs

public void ReplaceText(string sourcePDF, string destinationPDF, string textPhrase, string replacementText)
{
    // Open document
    using (Document pdfDocument = new Document(sourcePDF))
    {
        // Create TextAbsorber object to find all instances of the input search phrase
        TextFragmentAbsorber textFragmentAbsorber = new TextFragmentAbsorber(textPhrase);

        // Accept the absorber for all the pages
        pdfDocument.Pages.Accept(textFragmentAbsorber);
        
        // Get the extracted text fragments
        TextFragmentCollection textFragmentCollection = textFragmentAbsorber.TextFragments;
        
        // Loop through the fragments
        foreach (TextFragment textFragment in textFragmentCollection)
        {
            // Update text and other properties
            textFragment.Text = replacementText;
        }

        // Save resulting PDF document.
        pdfDocument.Save(destinationPDF);
    }
}