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HTML to XML Converter - Online Markup Translator

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HTML to XML Converter

Convert HTML markup to well-formed XML / XHTML instantly

Options
HTML Input
0 chars 0 lines
XML Output
0 chars 0 lines

Frequently Asked Questions

HTML to XML conversion transforms HTML markup into well-formed XML. HTML is more lenient — tags can be unclosed, attributes can be unquoted, and case doesn't matter. XML requires strict syntax: every tag must close properly, attributes must be quoted, and tag names are case-sensitive. This tool uses your browser's built-in parser to intelligently convert HTML into clean, valid XML/XHTML.

Many data processing pipelines, APIs, and transformation tools (like XSLT) require XML input. Converting HTML to XML makes your markup compatible with XML parsers and toolchains. It's also essential for RSS/Atom feed generation, sitemap creation, data interchange between systems, and when working with strict XML-based content management systems.

HTML5 has void elements (like <br>, <img>, <input>) that don't need closing tags — XML requires self-closing syntax (e.g., <br/>). HTML attributes can omit quotes for simple values; XML always requires quotes. HTML is case-insensitive; XML is case-sensitive. HTML allows mixed nesting and omitted end tags in some cases; XML enforces strict nesting. Essentially, all XML is valid, but not all HTML is valid XML.

The converter uses the browser's DOMParser, which automatically fixes common HTML issues — unclosed paragraphs get closed, improperly nested tags are corrected, and void elements (br, img, hr, etc.) are recognized. It then serializes the corrected DOM tree as strict XML using XMLSerializer, ensuring all tags are properly closed in the output.

Void elements are HTML tags that cannot have content and don't require a closing tag. The complete list includes: area, base, br, col, embed, hr, img, input, link, meta, param, source, track, and wbr. In XML output, these become self-closing (e.g., <br/>), which is the correct XHTML/XML syntax.

When enabled, the converter extracts only the content inside the <body> tags, discarding the outer HTML structure (<html>, <head>, etc.). This is useful when you're converting HTML fragments rather than complete documents. Disable it if you need the full XHTML document structure including the XML declaration wrapper.

This tool is specifically designed for HTML-to-XML conversion. For XML-to-HTML conversion, you would need a different approach — typically XSLT transformation or a dedicated XML-to-HTML converter. However, since XHTML (the output format) is also valid HTML5 when served with the correct MIME type, the output can often be used directly in browsers.

The conversion preserves all visible content and attributes. Minor differences may occur: HTML-specific entities like &nbsp; are converted to their numeric equivalents, HTML comments may be reformatted, and the browser's parser may normalize some quirky HTML structures. For most practical purposes, the semantic meaning and data are fully preserved.

XHTML (Extensible HyperText Markup Language) is HTML reformulated as XML. It combines HTML's familiar tags with XML's strict syntax rules. The output of this converter is essentially XHTML — valid XML that browsers can render as HTML. XHTML was popularized in the early 2000s and remains relevant for systems requiring XML-compatible markup.

Yes. Standard HTML entities (&lt;, &gt;, &amp;, &quot;, &apos;) are preserved. HTML-specific named entities like &copy; or &euro; are converted to their numeric XML-compatible equivalents (e.g., &#169;). Special characters in text content are properly escaped to ensure valid XML output.

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