.NET API to Convert 50+ File Formats

Simple API to Integrate Document & Image Conversion Functionality into .NET Applications without Installing any External Software.

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.NET document conversion API

GroupDocs.Conversion for .NET


GroupDocs.Conversion for .NET offers simple set of APIs, enabling developers to build powerful document conversion applications in C#, ASP.NET and other .NET related technologies. GroupDocs.Conversion for .NET API provides fast, efficient and reliable file conversion solution to your end-users. It supports performing accurate conversions among all popular business document formats including: PDF, HTML, Email, Microsoft Word documents, Excel spreadsheets, PowerPoint presentations, Project, Photoshop, CorelDraw, AutoCAD, diagrams, raster image file formats and many more. The document converter library auto-detects source document format and gives you all the control to convert either the whole document or specific pages to the desired output format. It’s easier to replace missing fonts with preferred ones and add text or image watermarks to any document page.

GroupDocs.Conversion for .NET can be used to develop applications in any development environment that targets .NET platform. It is compatible with all .NET based languages and supports popular operating systems (Windows, Linux, MacOS) where Mono or .NET frameworks (including .NET Core) can be installed.

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GroupDocs.Conversion for .NET Features



Easy Integration & Metered Licensing


Set Default Zoom Option when Converting to Words, Slides or Cells


Convert to/from all Popular Raster Image Formats & Assign Image DPI, Height & Width


Convert PDF & Image to Grayscale & Linearize PDF Document for the Web


Specify Bookmark Level, Heading Level and Expanded Level in Word to PDF/XPS Conversion


Configure & Place Watermark in Converted Document as Background to Display Behind Text


Render Email Header during Conversion from Email


Set Custom Font Directories & Explicitly Load/Substitute Font during Document Conversion


Set Default Font to Replace Missing Fonts for Documents, Slides & Spreadsheets Conversion


Advanced Conversion Methods to return the Output as Path or IO Stream


Convert Spreadsheet with Grid-lines & Remove Comments from Slides While Conversion


Convert Specific Document Pages as PDF Format & Convert Specific Cell Range in Spreadsheets


Show Hidden Sheets & Skip Empty Rows and Columns while Converting Spreadsheets


Count Total Pages of a Document & Set Password to Unprotected Document during Conversion


Option to Remove Annotations & Embedded Files from PDF


Create HTML 5 Compliant Markup when Converting to HTML


Auto-detect Source Type & Return all Possible Conversions when Converting from Stream


Ability to Return Each Page in Separate Stream while Converting to PDF or HTML


Show/Hide Markup, Comments & Track Changes while Converting from Word


DOCX to Tiff G3 Conversion with Shading Option


Convert Specific Layouts when Converting from CAD Document


Automatic Naming when Saving Converted Document to File


Metered Licensing Supported to be Billed based on the Usage of the API


Convert Diagrams to Word Processing File Formats

Easily Convert Document Formats

Using GroupDocs.Conversion for .NET, converting document file format is very easy. Following example shows you how to convert a PDF file into a DOC file using C#:

  • Get the file path as input
  • Get the file storage path
  • Convert the input document file
  • Return the output, as path or stream (as per requirement)

Easily Convert Document Formats using C#

 // Setup Conversion configuration and Initailize ConversionHandler
ConversionConfig config = new ConversionConfig();
config.StoragePath = @"D:\storage\"; 
 // Initailize ConversionHandler
ConversionHandler conversionHandler = new ConversionHandler(config);
// Convert and save converted document
var convertedDocumentPath = conversionHandler.Convert("sample.pdf", new WordsSaveOptions {  });
convertedDocumentPath.Save("result-" + Path.GetFileNameWithoutExtension("sample.pdf") + ".doc");

Conversion to Image Formats

GroupDocs.Conversion for .NET API supports document conversion to and from various image formats. While converting from some other format to image, you can adjust numerous properties of the images. Our conversion API allows you to adjust brightness, contrast, gamma properties. You can also flip the image. And in case of conversion to JPEG format, you can set color mode and compression mode of the file.

Supports various PDF Format Types

GroupDocs.Conversion for .NET API supports document conversion to following PDF types/formats:

  • PdfA_1A
  • PdfA_1B
  • PdfA_2A
  • PdfA_3A
  • PdfA_2B
  • PdfA_2U
  • PdfA_3B
  • PdfA_3U
  • v1_3
  • v1_4
  • v1_5
  • v1_6
  • v1_7
  • PdfX_1A
  • PdfX3

Support and Learning Resources


GroupDocs.Conversion offers document automation APIs for other popular development environments as listed below: