📄 XML Formatter & Validator

Format, validate, and syntax-highlight your XML.

XML Input

Line numbers

📌 Embed This Tool

Add the XML Formatter & Validator to your website for free. Just copy and paste the code below.

<!-- XML Formatter & Validator — Embed by ToolStand -->
<div style="position:relative;width:100%;max-width:100%;overflow:hidden;">
  <iframe src="https://toolstand.io/tools/xml-formatter/embed.html" 
    width="100%" height="500" frameborder="0"
    style="border:1px solid #e2e8f0;border-radius:8px;background:#fff;"
    loading="lazy" 
    title="XML Formatter & Validator | ToolStand"
    allow="clipboard-write"
    sandbox="allow-scripts allow-same-origin allow-popups allow-forms">
  </iframe>
</div>

📋 When to Use the XML Formatter & Validator

The XML Formatter & Validator is essential for developers and content creators who need clean, well-structured output. Use it before committing code, when reviewing pull requests, or when preparing data for presentation. It's perfect for enforcing consistent formatting across a team, cleaning up messy inputs from external sources, or quickly prettifying content for documentation. No configuration needed — just paste, format, and copy the result.

⚙️ How the XML Formatter & Validator Works

The XML Formatter & Validator uses a parsing and formatting pipeline that runs entirely in your browser. When you paste your input, the tool first parses it into an abstract syntax tree (AST) or structured representation, then reformats it according to language-specific rules — adjusting whitespace, indentation, line breaks, and structure. The formatted output preserves the original meaning while making it cleaner and more readable. All processing is client-side JavaScript, so your code is never exposed to any server.

How to Use the XML Formatter & Validator

Paste your XML — Drop any XML into the input area, even minified or messy markup. A sample is pre-loaded.
Click Format — Your XML is beautified with proper indentation and syntax highlighting. Tags, attributes, values, and comments each get distinct colors.
Or click Minify — Compress your XML to a single line, removing all unnecessary whitespace for production use.
Validate automatically — The parser checks XML structure. Errors appear with clear messages if your XML is malformed.

Frequently Asked Questions

How does validation work?

The browser's native DOMParser validates XML structure. If parsing fails, the specific error message is displayed. This catches unclosed tags, mismatched names, and invalid characters.

Does it preserve comments and CDATA?

Yes! XML comments (), CDATA sections, and processing instructions are preserved during formatting. The syntax highlighting also distinguishes them visually.

Can I format very large XML files?

Yes, but performance depends on your device. Files up to several megabytes format quickly. For very large files (50MB+), consider using a desktop XML tool.

What about XML namespaces?

Namespaces (xmlns attributes) are preserved as-is. The formatter doesn't modify or rearrange namespace declarations.