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Convert PDF to JPG

JPedal provides several methods to allow the conversion of a PDF file or directory of PDF files into JPG. Java examples use the ConvertPagesToImages and JpegEncoderOptions classes.

Convert PDF to JPG from Command Line or another language

Converting all pages to images

java -jar jpedal.jar --convert "inputFileOrDir" "outputDir" jpg

You can also provide different settings to adjust the conversion.

java -jar jpedal.jar --convert "inputFileOrDir" "outputDir" jpg ScalingAsFloat 
java -jar jpedal.jar --convert "inputFileOrDir" "outputDir" jpg ScalingAsFloat PageRange

The use of the named variables is detailed below.

  • ScalingAsFloat: A float value specifying the scaling applied to the output. This is the view scaling divided by 100, for instance 150% becomes 1.5
  • PageRange: The range of pages of convert. This follows the same rules as SetOfIntegerSyntax.
    This can be a series of comma separated values which are either single page number or range between to values using a dash. For example “1,3,4-7” would give pages 1,3,4,5,6,7

Convert PDF to JPG in Java with convenience static method

ConvertPagesToImages.writeAllPagesAsImagesToDir(
        "inputFileOrDir",
        "outputDir",
        "jpg",
        1.33f);

Convert PDF to JPG in Java with control over the image output

ConvertPagesToImages convert = new ConvertPagesToImages("/path/to/file.pdf");
try {
    if (convert.openPDFFile()) {
        for(int page = 1; page <= convert.getPageCount(); page++) {
            final BufferedImage bi = convert.getPageAsImage(page);
            final File out = new File("/path/to/output/" + page + ".jpg");
            // Setters to control output (example with compression)
            final JpegEncoderOptions options = new JpegEncoderOptions();
            options.setQuality(90); //Default is 75. No compression is 100
            JDeli.write(bi, options, out);
        }
    }
} catch (PdfException | IOException e) {
    e.printStackTrace();
} catch (Exception e) {
    e.printStackTrace();
}

convert.closePDFfile();

Convert PDF to JPG in Java with control over the page range of the output

ConvertPagesToImages convert = new ConvertPagesToImages("/path/to/file.pdf");
// setPageRange gives you the ability to chose the pages you'd like using '-' or ':' for range 
// and ',' to move to the next range or you can simply put null for all the pages
convert.setPageRange(new PageRanges("1-5,8:10,15")); 
// Above will give us pages 1 to 5(inclusive),8 to 10(inclusive) and 15
try {
    if (convert.openPDFFile()) {
        convert.getPageRange().forEachRemaining(page -> {
            try {
                final BufferedImage bi = convert.getPageAsImage(page);
                final File out = new File("/path/to/output/" + page + ".jpg");
                JDeli.write(bi, options, out);  
            } catch (Exception e) {
                e.printStackTrace();
            }
       });  
    }
} catch (PdfException e) {
    e.printStackTrace();
}                  

convert.closePDFfile();

Convert PDF to JPG thumbnails in Java with control over output image dimensions

ConvertPagesToImages.writeAllPagesAsImagesToDir(
        "inputFileOrDir",
        "outputDir",
        "jpg",
        new int[] {width, height});

or

ConvertPagesToImages convert = new ConvertPagesToImages("/path/to/file.pdf");
//fit with aspect ratio preserved (width will be 300 or height will be 400)
convert.setFitToSize(new int[] {300,400}); 
try {
    if (convert.openPDFFile()) {
        for (int page = 1; page <= convert.getPageCount(); page++) {
            final BufferedImage bi = convert.getPageAsImage(page);
            final File out = new File("/path/to/output/" + page + ".jpg");
            JDeli.write(bi, OutputFormat.JPEG, out);           
        }
    }
} catch (PdfException | IOException e) {
    e.printStackTrace();
} catch (Exception e) {
    e.printStackTrace();
}

convert.closePDFfile();

Convert PDF to JPG thumbnails in Java with control over scaling

ConvertPagesToImages convert = new ConvertPagesToImages("/path/to/file.pdf");
convert.setPageScaling(1.33f); //which gives same size as Acrobat at 100%
try {
    if (convert.openPDFFile()) {
        for (int page = 1; page <= convert.getPageCount(); page++) {
            final BufferedImage bi = convert.getPageAsImage(page);
            final File out = new File("/path/to/output/" + page + ".jpg");
            JDeli.write(bi, OutputFormat.JPEG, out);           
        }
    }
} catch (PdfException | IOException e) {
    e.printStackTrace();
}  catch (Exception e) {
    e.printStackTrace();
}

convert.closePDFfile();

Convert PDF to JPG in Java with a password-protected PDF file

ConvertPagesToImages convert = new ConvertPagesToImages("/path/file.pdf");
convert.setPassword("password"); 
try {
    if (convert.openPDFFile()) {
        for (int page = 1; page <= convert.getPageCount(); page++) {
            final BufferedImage bi = convert.getPageAsImage(page);
            final File out = new File("/path/to/output/" + page + ".jpg");
            JDeli.write(bi, OutputFormat.JPEG, out); 
        }
    }
} catch (PdfException | IOException e) { 
    e.printStackTrace(); 
}  catch (Exception e) {
    e.printStackTrace();
}

convert.closePDFfile();

If you are looking for upscaling or more complex control over the PDF to JPG conversion, ConvertPagesToHiResImages class has lots of additional options


Why JPedal?

  • Actively developed commercial library with full support and no third party dependencies.
  • Process PDF files up to 3x faster than alternative Java PDF libraries.
  • Simple licensing options and source code access for OEM users.

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