Render & Display Documents via .NET API

‎.NET Document Viewer API to Render 170+ document formats into PDF, HTML and Image with Powerful ‎Configuration Options.‎

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.NET Document Viewer API

GroupDocs.Viewer for .NET


GroupDocs.Viewer for .NET APIs help you create powerful applications in C#, ASP.NET ‎and other .NET-based technologies, which can render and display documents and images of 170+ file ‎formats without installing any external software. The file viewer library rasterizes the documents and then converts them into SVG+HTML+CSS to optimize the overall document rendering experience for viewing business documents, images, ‎text files, diagrams, graphics, email attachments and PDF files with speed, true-text and high-fidelity inside your applications. You have the option to add document viewing and reading functionalities in your applications to display ‎whole document, partial document, specific page/cell range, individual document layer, with or ‎without annotations and comments for the supported file formats.‎

GroupDocs.Viewer for .NET caches the rendered documents output to the local disk by default. Any type of external cache storage is also supported by implementing appropriate interfaces – Amazon S3, Dropbox, Google Drive, Windows Azure, Redis or any other. ‎

GroupDocs.Viewer for .NET Features



Rasterize Documents and Convert them into SVG, HTML & CSS


Convert Text to HTML and Render Documents to get HTML, Image or PDF Representation


Faster Loading Time using Cached Versions of Documents


Convert Presentations with Shapes and Text with 3D Effects


Encode Word, Excel and Email Documents to Desired Encoding Standard


Render Documents located at FTP or Cloud Storage Locations


Render with or without Annotations & Comments


Option to Render all the Pages of a Document as Separate HTML Pages


Render Hidden Pages and Slides & Reorder Pages of Rendered Document


Render All, Selected Pages or Range of Pages into HTML


Render or hide document comments


Rendering Document as Responsive HTML for Some Document Formats


Excluding Fonts when Rendering to HTML to reduce Resultant File Size


Minify CSS & HTML Output by Removing Comments, Extra White-Spaces etc.‎


Read the Text Contained in a Source Document through its Coordinates


Show/Hide the Grid Lines of Excel Sheets in Output Representation


Specify the Number of Rows in an Excel sheet to be rendered on Each Page


Ignore Empty Columns while Rendering Spreadsheet Documents


Render Word Documents into HTML Pages, Images or PDF, with Track Changes


Render Email Attachments as Original Files, Images or in ‎HTML representation


Set printing restrictions on PDF documents


Render Content/Files contained in ZIP Archives as Attachments


Obtain Attachments from Password Protected Documents


Render Programming Languages File Formats as Plain Text


Adjust Background Colors when Viewing CAD Drawings


View PLT files and Convert to PDF, HTML, JPG & PNG


Get Worksheet Names from Excel file – Display Spreadsheet Column Headings and Row numbers


View & Convert Microsoft Project Documents with Notes


Convert CAD Drawings to SVG for better Viewing & Zooming Experience


Choose to Render Visio Figures without Scheme

View Documents Efficiently & Reliably

Using GroupDocs.Viewer API you can display more than 90 document formats efficiently and reliably ‎with content and document structure integrity intact. Following sample code shows that how easy it is ‎to view HTML representation of a DOCX document:‎

Display HTML Representation of a DOCX Document using C#‎

// Set output directory for saving rendered pages
string  pageFilePathFormat = Path.Combine("D:\\output", "page_{0}.html");
using  (Viewer viewer = new Viewer("D:\\storage\\sample.docx"))
     // Set options to get HTML with embedded resources
     HtmlViewOptions options = HtmlViewOptions.ForEmbeddedResources(pageFilePathFormat);
     // Render document

Apply Transformation to Rendered Output

You can perform various transformations to the rendered output document using GroupDocs.Viewer ‎for .NET API. These transformation options give you control on the way you present the rendered ‎output for display. The available transformations are, page rotation option, page reorder option and ‎applying text watermark.‎

Working with Outlook Data Files

GroupDocs.Viewer for .NET API can render the items in Outlook Data Files (OST/PST) as PDF, HTML and Image Files. Our ‎Viewer API also has the ability to obtain the list of folders contained in Outlook Data Files. Using ‎GroupDocs.Viewer for .NET API, you can specify the folder to render from Outlook Data Files. Likewise, ‎‎you can also obtain email messages contained in OST/PST formats as attachments. GroupDocs.Viewer for .NET also enables you to filter messages from OST/PST formats based on subject, content or sender.

Working with CAD Documents

GroupDocs.Viewer for .NET API can render model and all non-empty layouts or render a specific layout of a CAD file. GroupDocs.Viewer for .NET API also supports tiled rendering or rendering by coordinates of CAD documents into image, HTML or PDF. You can also obtain layer statuses for CAD documents.

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Support and Learning Resources


GroupDocs.Viewer offers document viewing APIs for other popular development environments as listed below: