pdfOCR: How to OCR an Image to PDF?

With our open source tool, pdfOCR, it is possible to OCR an image to a PDF, with just a few lines of code.

don't forget to specify the path to your Tesseract Data in your code TESS_DATA_FOLDER below. You can always find trained models here.

JAVA

import com.itextpdf.kernel.pdf.PdfWriter;
import com.itextpdf.pdfocr.OcrPdfCreator;
import com.itextpdf.pdfocr.tesseract4.Tesseract4LibOcrEngine;
import com.itextpdf.pdfocr.tesseract4.Tesseract4OcrEngineProperties;

import java.io.File;
import java.io.IOException;
import java.util.Arrays;
import java.util.List;


public class JDoodle {

	static final Tesseract4OcrEngineProperties tesseract4OcrEngineProperties = new Tesseract4OcrEngineProperties();
    private static List<File> LIST_IMAGES_OCR = Arrays.asList(new File("invoice_front.jpg"));
    private static String OUTPUT_PDF = "/myfiles/hello.pdf";

    public static void main(String[] args) throws IOException {
        final Tesseract4LibOcrEngine tesseractReader = new Tesseract4LibOcrEngine(tesseract4OcrEngineProperties);
        tesseract4OcrEngineProperties.setPathToTessData(new File(TESS_DATA_FOLDER));

        OcrPdfCreator ocrPdfCreator = new OcrPdfCreator(tesseractReader);
        try (PdfWriter writer = new PdfWriter(OUTPUT_PDF)) {
            ocrPdfCreator.createPdf(LIST_IMAGES_OCR, writer).close();
        }
    }

}

C#

using System.Collections.Generic;
using System.IO;
using iText.Kernel.Pdf;
using iText.Pdfocr;
using iText.Pdfocr.Tesseract4;

private static readonly Tesseract4OcrEngineProperties tesseract4OcrEngineProperties =
            new Tesseract4OcrEngineProperties();

public class Program
{
    private static string OUTPUT_PDF = "/myfiles/hello.pdf";

    private static IList<FileInfo> LIST_IMAGES_OCR = new List<FileInfo>
    {
        new FileInfo("invoice_front.jpg")
    };

    static void Main() {
    {
		var tesseractReader = new Tesseract4LibOcrEngine(tesseract4OcrEngineProperties);
        tesseract4OcrEngineProperties.SetPathToTessData(new FileInfo(TESS_DATA_FOLDER));
        
		var ocrPdfCreator = new OcrPdfCreator(tesseractReader);
        using (var writer = new PdfWriter(OUTPUT_PDF))
        {
            ocrPdfCreator.CreatePdf(LIST_IMAGES_OCR, writer).Close();
        }
    }
}