OCR Library for PDF and Images in C#

using Syncfusion.OCRProcessor;
using Syncfusion.Pdf.Parsing;

// Initialize the OCR processor
using (OCRProcessor processor = new OCRProcessor())
{
    // Load the existing PDF document
    using (FileStream stream = new FileStream("Input.pdf", FileMode.Open, FileAccess.Read))
    {    
      PdfLoadedDocument pdfLoadedDocument = new PdfLoadedDocument(stream);
      // Set OCR language to process
      processor.Settings.Language = Languages.English;
      // Process OCR by providing the PDF document
      processor.PerformOCR(pdfLoadedDocument);
      // Save the OCRed document
      using (FileStream outputFileStream = new FileStream(@"Output.pdf", FileMode.Create, FileAccess.ReadWrite))
      {
        //Save the PDF document to file stream.
        pdfLoadedDocument.Save(outputFileStream);
      }
      //Close the document.
      pdfLoadedDocument.Close(true);
    }    
}