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GroupDocs.Viewer for .NET is a .NET document viewer and rendering API for C# that lets developers view and render 190+ document and image formats without installing Microsoft Office or other third-party software. It supports popular formats such as DOCX, XLSX, PPTX, PDF, CAD drawings, emails, archives, and images, and can render documents to HTML, PDF, PNG, or JPG.

The following C# example shows how to render a DOCX document to HTML with embedded resources:

using GroupDocs.Viewer;
using GroupDocs.Viewer.Options;

// Render a DOCX file to HTML with embedded resources
using (Viewer viewer = new Viewer("sample.docx"))
{
    viewer.View(HtmlViewOptions.ForEmbeddedResources("page_{0}.html"));
}

Starting with version 26.8, GroupDocs.Viewer is distributed as a NuGet metapackage. Install the GroupDocs.Viewer package and NuGet automatically restores the runtime package that matches your project’s target framework, such as net462, net6.0, or net6.0-windows. See Installation for details.

• 190+ Supported File Formats: Render Microsoft Office, PDF, HTML, CAD, email, archives, images, and more.
• Multiple Rendering Formats: Render documents to HTML, PDF, PNG, and JPG.
• Embedded or External Resources: Produce self-contained HTML pages or HTML with separate CSS, fonts, and images.
• Document Format Detection: Automatically detects the format of input files.
• Windows, Linux, and macOS: One package covers .NET Framework 4.6.2+, .NET 6, and .NET 6 Windows.

GroupDocs.Viewer supports 190+ file formats across documents, spreadsheets, presentations, images, emails, CAD files, archives, and other commonly used file types. See the full list of supported formats.

• Microsoft Office: Word, Excel, PowerPoint
• PDF: PDF, PDF/A
• OpenDocument: ODT, ODS, ODP
• Images: JPEG, PNG, TIFF, GIF, BMP, PSD
• Email: EML, MSG, PST, OST
• eBook: EPUB, MOBI
• Text/Markdown: TXT, MD
• HTML/Web: HTML, MHTML, CHM
• AutoCAD: DWG, DXF, DWF
• Archives: ZIP, RAR, 7Z

To start viewing documents in a .NET application, check Quick Start Guide, System Requirements, install the GroupDocs.Viewer, and review the Supported File Formats and How to Run Examples guides.

The Developer Guide provides practical C# examples for working with GroupDocs.Viewer for .NET. Learn how to load documents, view and render files, retrieve document information, render specific pages, configure HTML/PDF/image output, and customize document rendering.

If you encounter an issue while using GroupDocs.Viewer for .NET or have a question about document rendering, visit the Technical Support page. It provides available support channels, troubleshooting resources, and ways to report issues or request assistance.