Features List

Aspose.HTML for .NET is a headless C# library for creating, loading, editing, navigating, saving, and converting HTML-related documents. It works with HTML, XHTML, SVG, EPUB, MHTML, and Markdown source documents and can render or save them to supported output formats such as PDF, XPS, DOCX, Markdown, JPG, PNG, TIFF, BMP, and GIF.

The API is designed around web platform concepts such as DOM, CSS, SVG, JavaScript, Canvas, resource loading, and rendering. This page summarizes the main Aspose.HTML for .NET features and links to the documentation sections where you can explore them in detail.

Document Manipulation

Aspose.HTML for .NET lets you create, load, inspect, edit, and save HTML-family documents without opening a browser UI.

Create a new HTML document or open an existing (X)HTML or SVG document. You can load documents from a local file or directly from the web.
Save an HTML document together with referenced resources such as CSS and images. The saver can store the document itself, its linked resources, and other documents referenced by it.
Create, edit, remove, and replace HTML nodes through a DOM-based API aligned with the official DOM specification.
Configure the document environment to control user stylesheets, font folders, external resource handling, runtime services, and related processing behavior.

Data Extraction

Aspose.HTML for .NET is not positioned as a web scraper by itself, but it can be used to collect information from loaded HTML documents and navigate their DOM structure.

Navigate through HTML elements with DOM APIs. Aspose.HTML for .NET implements Traversal interfaces that help you move through the DOM tree.
Query HTML documents with XPath. Aspose.HTML for .NET supports XPath 1.0 interfaces defined for DOM traversal and querying.
Collect elements with CSS selectors. CSS selector queries are useful when you need to find elements by tag, class, ID, attribute, or structural relationship.

Conversion

One of the main goals of Aspose.HTML for .NET is to provide simple, customizable, and precise converters for HTML-related source formats.

Simplicity. The .NET API can convert HTML, XHTML, SVG, EPUB, MHTML, and Markdown to supported formats with compact C# code. The following example converts HTML to PDF:

1// Convert HTML to PDF using C#
2
3Aspose.Html.Converters.Converter.ConvertHTML(@"<span>Hello, World!!</span>", ".", new Aspose.Html.Saving.PdfSaveOptions(), "output.pdf");

Example-ConvertHtmlToPdfInOneLineOfCode.cs hosted with ❤ by GitHub

Customizability. Aspose.HTML for .NET lets you fine-tune converters and control many aspects of rendering and conversion. In addition to page size or image resolution, you can customize external resource processing, configure a custom stylesheet, set fonts, adjust page setup, and control output options.

Precision. Core components are designed according to official HTML, DOM, CSS, and SVG specifications, which helps produce predictable parsing, rendering, and conversion results.

Aspose.HTML for .NET converters can be grouped by workflow:

Fixed-layout converters convert HTML, XHTML, SVG, EPUB, and MHTML to PDF, XPS, DOCX, and raster image formats such as PNG, JPG, TIFF, BMP, and GIF.
Markdown converters convert Markdown to HTML and HTML to Markdown.
Template converters create an HTML file from a template.

Explore the full conversion workflow map in Converting Between Formats.

Built-in Web Platform Features

A real-world HTML page is a complex set of related formats and technologies. Aspose.HTML for .NET includes implementations for core HTML-related technologies used during parsing, manipulation, and rendering.

Feature area	What Aspose.HTML for .NET supports
HTML parsing	Parser behavior follows the HTML specification, helping produce a correct DOM tree for loaded documents.
JavaScript processing	JavaScript processing supports the ECMA-262 5.1 specification for scripts processed during document parsing or runtime. You can set a JavaScript processing timeout or disable script execution.
CSS	CSS3 is supported out of the box. Aspose.HTML for .NET includes CSS manipulation APIs and lets you apply stylesheets to the whole document or edit styles for a particular node.
HTML Canvas	HTML Canvas is supported. You can draw on it with JavaScript or use the HTML Canvas API.
SVG	SVG parsing and rendering are based on the SVG 2 specification, including support for modern SVG elements such as filters.

Platform Independence

You can use Aspose.HTML for .NET in 32-bit and 64-bit .NET applications, including web, desktop, service, and command-line projects. The package provides a .NET Standard 2.0 assembly and can be used on supported Windows, Linux, and macOS environments where the target .NET runtime and required native dependencies are available.

For the detailed compatibility matrix, see System Requirements.

Helpful Extensions

Aspose.HTML for .NET also includes helper APIs and extensions for common HTML-related tasks.

HTML Form Editor – edit and submit HTML forms with a dedicated utility class.
Vendor-specific CSS extensions – use Aspose.HTML CSS extensions, for example to add page numbers during rendering.

Common Feature Selection Issues

Issue	Cause	Fix
Expecting Aspose.HTML to behave like an interactive browser	Aspose.HTML for .NET is a headless library for document processing, DOM manipulation, and rendering workflows, not a browser UI automation tool.	Use it for loading, editing, extracting, saving, and converting HTML-related documents. For browser UI testing, use a browser automation framework.
Choosing the wrong API for data extraction	DOM navigation, XPath, and CSS selectors solve different querying problems.	Use DOM navigation for tree traversal, XPath for structured document queries, and CSS selectors for element matching by selector syntax.
Conversion output differs between environments	Rendering can depend on fonts, external resources, JavaScript settings, CSS, and runtime dependencies.	Configure fonts, resource loading, runtime services, and save options explicitly. For Linux image rendering issues, see Linux Docker Fonts for HTML to Image.
Assuming every supported output is editable	PDF, XPS, and raster images are rendering targets and are not ideal for semantic editing.	Use HTML-family output or DOCX when the next workflow requires editing document content.
Using outdated framework assumptions	Legacy framework support depends on current package and Microsoft runtime support.	Check System Requirements before choosing a target framework for a new project.

FAQ

What can Aspose.HTML for .NET do?

Aspose.HTML for .NET can create, load, edit, navigate, save, extract data from, and convert HTML-related documents in C# applications.

Is Aspose.HTML for .NET a web scraper?

It is not a dedicated web scraper, but it can load HTML documents and extract data with DOM navigation, XPath queries, and CSS selectors.

Which formats can Aspose.HTML for .NET convert?

Aspose.HTML for .NET supports conversion workflows for HTML, XHTML, SVG, MHTML, EPUB, and Markdown sources to supported output formats such as PDF, XPS, DOCX, Markdown, and images. See Supported File Formats for the full table.

Can I customize conversion output?

Yes. You can configure save options, page setup, image resolution, fonts, stylesheets, external resource handling, and JavaScript runtime behavior depending on the workflow.

Where should I start after reviewing the feature list?

Start with Installation, then review Supported File Formats and Converting Between Formats.

Next Steps

Installation – add Aspose.HTML for .NET to a C# project with NuGet, Package Manager Console, .NET CLI, DLL references, or MSI.
Supported File Formats – check input and output formats for document processing and conversion.
Converting Between Formats – open the conversion hub for HTML, SVG, MHTML, EPUB, and Markdown workflows.
How to Run the Examples – run C# examples from the Aspose.HTML for .NET GitHub repository.

Getting Started Supported File Formats