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PDF Rendering
Convert PDF to Image (.NET)
Convert PDF to image on Android (Xamarin)
Convert PDF to image on iOS (Xamarin)
Convert PDF to image in Windows Store apps (.NET)
Convert PDF to image in Windows Phone apps (.NET)
PDF to image in Universal Windows Store apps (.NET)
Free PDF Viewer control for Windows Forms (.NET)
How to integrate PDF Viewer control in WPF app (.NET)
Creating WPF PDF Viewer supporting bookmarks (.NET)
Cross-platform PDF Viewer using GTK# (MONO)
Silverlight PDF viewer control (Silverlight 5)
Multithreaded PDF rendering (.NET)
Convert pdf to image in Silverlight app (C# sample)
How to set fallback fonts for PDF rendering (C#)
Avoiding the out-of-memory exception on rendering (C#)
PDF viewer single page application (WebAPI, AngularJS)
PDF viewer control for Windows 10 universal applications
Use custom ICC profile for CMYK to RGB conversion
PDF layers - separate images, text, annotations, graphics

PDF Forms Creation PDF Security
Conversion to PDF/A
Other topics
PDF Document Manipulation
PDF Content Generation
Fixed and Flow layout document API (.NET)
Creation of grids and tables in PDF (C# sample)
How to create interactive documents using Actions (C# sample)
Text flow effects in PDF (C# sample)
How to generate ordered and bulleted lists in PDF (C# sample)
Convert HTML to PDF using flow layout API (C# sample)
How to use custom fonts for PDF generation (.NET)
Create document with differently sized pages (C#)
Create PDF documents using MONO (C#/MONO/Windows/OSX)
How to use background images for content elements (C#/PDF Kit/FlowLayout)
Add transparent images to PDF document (C#)
Draw round rect borders in PDF documents(C#)
ICC color profiles and and ICC based colors in PDF (C#)
How to use bidirectional and right to left text in PDF (C#)
Create PDF documents from XML templates (C# sample)
How to resize PDF pages and use custom stamps (C#)
Add header and footer to PDF page (.NET sample)
How to use clipping mask for drawing on PDF page
Fill graphics path with gradient brushes in PDF (Shadings)
Apitron PDF Kit and Rasterizer engine settings
Add layers to PDF page (optional content, C# sample)
How to create free text annotation with custom appearance

PDF Content Extraction
PDF Navigation

PDF to TIFF conversion
Contact us if you have a PDF related question and we'll cover it in our blog.


How to convert PDF to HTML (C# sample)


While PDF itself is a perfect format for storing documents, sometimes you might be interested in converting it to HTML for various reasons, e.g. for implementing quick presenter capable to provide text selection by using web browser control as a host, or for implementing PDF viewer for your website.

One of the problems is that PDF has very sophisticated drawing model, so it can’t be translated one to one even using HTML5 features. It means that complex drawings won’t be nicely converted using traditional methods, but we have implemented a solution that gives predictable results even for files containing advanced vector drawings.

Every graphical object will be converted to image using the same graphical engine as used in Apitron PDF Rasterizer product, while the text objects will be handled by the web browser. As a result you may expect PDF to HTML conversion to work fine in almost all cases.

The code

The following code sample demonstrates how to convert PDF to HTML. As it can be seen from the code below, we’re using HtmlPage option for this conversion with default resolution for images (72 dpi as PDF default). It’s also possible to convert using HtmlFragment option creating a DIV object that can be embedded into the existing container (other DIV for example).

class Program
    static void Main(string[] args)
        // open pdf document
        using (Stream inputStream = File.OpenRead("../../data/notification.pdf"))
            using (FixedDocument doc = new FixedDocument(inputStream))
                // create output file
                using (TextWriter writer =
new StreamWriter(File.Create("c:/out.html"),Encoding.UTF8))
                    Page page = doc.Pages[0];
                    // write returned html string to file


The complete example can be found in our github repository. It’s also possible to extract only drawings from PDF page, check page’s ExtractDrawings method for the details.

Original PDF document opened in PDF viewer:

Pic. 1 Original PDF file before conversion

Pic. 1 Original PDF file before conversion

Converted from PDF to HTML using Apitron PDF Kit for .NET:

Pic. 2 Converted HTML file opened in MS Edge

Pic. 2 Converted HTML file opened in MS Edge


While PDF to HTML conversion is a hard task to implement it properly, we’ve made a significant improvement in this area and hope you’ll like this new functionality added into the Apitron PDF Kit product. It’s now in publicly available beta stage, so we’d highly appreciate your feedback and comments. Please don’t hesitate to contact us with any questions or concerns.


Convert PDF to image using ICC color profile for CMYK to RGB transformation


Printing industry has many standards and modern printing devices actually operate with colors using specific colorspaces different from well-known sRGB or AdobeRGB. One of the widely used colorspaces is CMYK [Cyan, Magenta, Yellow, blacK] and when you have to convert a PDF page prepared for publishing in CMYK to jpeg or other raster format, you have to apply a color transform because CMYK bitmaps don’t have the level of support they should have gotten in software tools.

Luckily, PDF defines a standard way to handle this conversion – ICC color profiles, these profiles define the conversion rules and contain all data needed to perform the transformation. Profiles are being created considering the target device or medium (or both), e.g. a special kind of paper, printer model etc. There are lots of publicly available color profiles, and some of them became more popular than others.

PDF standard supports content drawn in, so-called, Device CMYK colorspace – a “generic” CMYK colorspace that doesn’t have any associated transformation data. It becomes transformed to RGB or any other colorspace according to rules specified by the DEVICE used to present the content, hence the naming Device CMYK. Sometimes a color profile gets embedded into the file and special type of colorspace named ICCBasedColorspace is used to reference it. It makes content color transformation independent from the device as it defines its own transformation to the target colorspace for all colors that belong to ICCBasedColorspace.

If you use Apitron PDF Rasterizer and would like to apply a custom CMYK to RGB color profile instead of default one, you can do it easily using the EngineSettings class. The next section contains a code sample demonstrating it.

The code

/// <summary>
/// This program demonstrates how to use custom CMYK profile for
/// CMYK to RGB transformation.
/// </summary>
class Program
    static void Main(string[] args)
        string outputFileName = "output.png";

        using (Stream stream = File.OpenRead("../../data/cmyk.pdf"),
            profileStream = File.OpenRead("../../data/profile.icc"))
            // set global CMYK profile to be used 
            // for CMYK -> RGB conversion,
            // it's also possible to pass engine settings as a parameter
            // during Document object creation.
            EngineSettings.GlobalSettings.CMYKColorProfile =
                new IccColorProfile(profileStream);

            using (Document doc = new Document(stream))
                Bitmap result = doc.Pages[0].Render(
                    new Resolution(96, 96),
    new RenderingSettings());


The complete example can be found in our github repository.


Original PDF document, shown in PDF reader:

Pic. 1 Original PDF file in CMYK

Pic. 1 Original PDF file in CMYK

Converted using Apitron PDF Rasterizer (default profile):

Pic. 2 Converted using default CMYK profile
Pic. 2 Converted using default CMYK profile

Converted by Apitron PDF Rasterizer using custom profile set using EngineSettings class:

Pic. 3 Converted using custom CMYK profile

Pic. 3 Converted using custom CMYK profile


Apitron PDF Rasterizer for .NET is a powerful library that allows you to do more by doing less. You can customize PDF to image conversion results by using its rich and smart API, and if you need a base to start with, we have lots of ready to use samples.  Nowadays, .NET is not limited to Windows ecosystem and runs on iOS and Android (thanks to Xamarin) as well as any Mono-aware platform, and our tools are not exclusion. Whenever you need any help, just let us know and get a guaranteed reply from our techies.