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C# PDF to PNG Library
How to convert PDF to PNG image files using C#.net in web, windows application


C#.NET PDF to PNG Convertion without open source library, such as itextsharp, pdfsharp, imagemagick.





In this tutorial, you learn how to convert PDF to jpg using C# in ASP.NET web app, and Windows application.

How to PDF file to JPG images using C#

  1. Download XDoc.PDF JPEG Converter C# library
  2. Install C# library to convert PDF document to JPG images
  3. Step by Step Tutorial










RasterEdge PDF to JPEG converting control SDK (XDoc.PDF for .NET) supports converting PDF file png image file in .NET developing platforms using simple C# programming code.

You can view more C# PDF conversion functions at c# convert bitmap to pdf, c# convert pdf to jpg, convert pdf to image using c#.net, c# pdf to tiff converter, docx to pdf c#, convert csv to pdf c#.





Quick to convert PDF page to PNG image using C#.NET


The following steps and sample c# code will show how to quickly convert a PDF page to PNG image.

  1. Create a new PDFDocument with an existing PDF file loaded
  2. Get a PDFPage object from the first page of the PDF document
  3. Call PDFPage.ConvertToImage() to convert PDF page to a PNG image file


            String inputFilePath = @"W:\Projects\Test-Files\file1.pdf";
            String outputFilePath = @"W:\Projects\Test-Output\RasterEdge.com\pdf-convert-pdf-to-png-start.png";

            //  Open file and get the target page
            PDFDocument doc = new PDFDocument(inputFilePath);

            PDFPage page = (PDFPage)doc.GetPage(0);
            //  Convert page to a PNG image
            page.ConvertToImage(ImageType.PNG, outputFilePath);




PDF to PNG Image Options Using C#


With XDoc.PDF for .NET, you can easily convert single PDF file or mutliple PDF documents into PNG images. The following png image settings supported in class "ImageOutputOption":


  1. Color: Output png image is Monochrome, Gray, Color.

  2. PngInterlance: True, create an Interlaced PNG; False, create a Non-interlaced PNG.
    Non-interlaced PNG encodes an image from start to finish; but Interlaced PNG encodes a whole image at low quality at beginning and then on each successive pass it encodes more of the detail, until the complete image has been processed.

  3. PngFilter: In PNG, a filter algorithm could be applied before compression which makes the image data for optimum compression.
    None: the scanline is transmitted unmodified.
    Sub: it transmits the difference between each byte and the value of the corresponding byte of the prior pixel.
    Up: it is just like the Sub filter except that the pixel immediately above the current pixel, rather than just to its left, is used as the predictor.
    Average: it uses the average of the two neighboring pixels (left and above) to predict the value of a pixel.
    Paeth: it computes a simple linear function of the 3 neighboring pixels (left, above, upper left), then chooses as predictor the neighboring pixel closest to the computed value.

  4. Zoom: Set zoom value to 2F. Use more pixels to render the page.

  5. Resolution: Set image resolution value in the PNG file.



String inputFilePath = @"C:\1.pdf";
String outputFilePath = @"C:\output.png";

ImageOutputOption options = new ImageOutputOption();
//  Set output image type.
options.Type = ImageType.PNG;
//  Output image is grayscale.
options.Color = ColorType.Gray;
//  Set interlaced flag to true.
options.PngInterlance = true;
//  Set filter type to SUB
options.PngFilter = FilterPNG.SUB;
//  Set zoom value to 2F. Use more pixels to render the page.
options.Zoom = 2F;
//  Set resolution value in the PNG file to 300 dpi.
options.Resolution = 300;

//  Open file and get the target page
PDFDocument doc = new PDFDocument(inputFilePath);
PDFPage page = (PDFPage)doc.GetPage(0);
//  Convert page to a PNG image
page.ConvertToImage(options, outputFilePath);


String inputFilePath = @"C:\1.pdf";
String outputFilePath = @"C:\output.png";

ImageOutputOption options = new ImageOutputOption();
//  Set output image type.
options.Type = ImageType.PNG;
//  Output image is color.
options.Color = ColorType.Color;
//  Set interlaced flag to false.
options.PngInterlance = false;
//  Set filter type to Average
options.PngFilter = FilterPNG.Average;
//  Set resolution value in the PNG file to 192 dpi.
options.Resolution = 192;

//  Open file and get the target page
PDFDocument doc = new PDFDocument(inputFilePath);
PDFPage page = (PDFPage)doc.GetPage(0);
//  Convert page to a PNG image
page.ConvertToImage(options, outputFilePath);






How to convert multiple PDF files to PNG image files using C# .NET


The below steps and c# source code will instruct how to convert all PDF files in one file directory to PNG image files using C# .NET

  1. Get all PDF file paths under one directory
  2. For each PDF file, create a new PDFDocument with PDF content loaded.
  3. Call PDFPage.ConvertToImage() to convert each PDF page to a PNG image file


            String inputDirectory = @"C:\input\";
            String outputDirectory = @"C:\output\";
            String[] files = Directory.GetFiles(inputDirectory, "*.pdf");
            foreach (String filePath in files)
            {
                int startIdx = filePath.LastIndexOf("\\");
                int endIdx = filePath.LastIndexOf(".");
                String docName = filePath.Substring(startIdx + 1, endIdx - startIdx - 1);
                PDFDocument doc = new PDFDocument(filePath);
                doc.ConvertToImages(ImageType.PNG, outputDirectory, docName);
            }