XML Formatter & Beautifier

The XML Formatter & Beautifier is a free online tool that validates your XML and re-indents it into clean, readable, properly nested markup. Paste a document and it instantly checks that the XML is well-formed, pretty-prints it with the indentation you choose, and shows a clear message pointing to the problem when something is wrong.

Everything happens locally in your browser using the native DOMParser, so your files, API responses, and configuration data never leave your machine. There are no uploads, no accounts, and no server-side processing.

How to format and beautify XML

1. Paste or type your XML into the input panel on the left.
2. Choose your indentation: 2 spaces, 4 spaces, or tabs.
3. Click Format & Validate to pretty-print, or Minify to collapse it onto a single line.
4. Read the status bar: a green message confirms the XML is well-formed, while a red message describes the parse error.
5. Use Copy or Download to grab the result as an .xml file.

What is XML?

XML (Extensible Markup Language) is a text-based format for storing and transporting structured data using nested tags and attributes. It powers configuration files, SOAP APIs, RSS and Atom feeds, sitemaps, Office documents, and countless data-exchange formats. Because XML is verbose and often arrives from a server on a single unbroken line, a formatter is essential for making it readable before you debug or edit it.

Why validate XML well-formedness?

An XML document is "well-formed" only when every tag is closed, elements are properly nested, there is exactly one root element, and special characters like &, <, and > are escaped. A single mismatched or unclosed tag will stop a parser cold. This tool runs the same well-formedness check your browser uses and reports the first error so you can fix it in seconds instead of hunting line by line.

XML Formatter features

• Native validation via the browser's DOMParser, with a clear, readable parse-error message.
• Configurable indentation — 2 spaces, 4 spaces, or tabs — for consistent, diff-friendly output.
• Minify mode that collapses a document to one compact line and drops insignificant whitespace.
• Structure-aware handling that preserves declarations, comments, CDATA sections, processing instructions, and attribute order.
• Copy and Download the result instantly as an .xml file.
• 100% client-side — nothing is uploaded, logged, or stored.

Formatting vs. minifying XML

Beautifying adds line breaks and indentation so a human can scan the hierarchy, which is what you want while debugging or reviewing a document. Minifying strips the whitespace between elements to shrink the payload, which is what you want before shipping XML over the wire or embedding it in another file. The two are lossless opposites: format to read, minify to transmit.

XML rarely lives alone in a modern stack. If your services also emit JSON, the JSON Formatter beautifies and validates that format the same way, and when you need to move data between the two, the JSON to XML Converter handles the transformation. Teams that write infrastructure definitions often keep the YAML Formatter & Validator close by, while anyone tidying database scripts reaches for the SQL Formatter & Beautifier. And once your data is readable, the HTML Minifier is the counterpart for shrinking sibling markup before production.

Frequently Asked Questions

Is my XML data uploaded to a server?

No. All parsing, validation, and formatting happen locally in your browser using client-side JavaScript and the native DOMParser. Your XML is never sent to, stored on, or seen by any server.

What does "well-formed" XML mean?

Well-formed XML follows the basic syntax rules of the format: a single root element, every opening tag has a matching closing tag, elements are nested correctly, attribute values are quoted, and reserved characters are escaped. This tool checks well-formedness; it does not validate against a DTD or XSD schema.

Why does my XML fail to validate?

The most common causes are a mismatched or unclosed tag, more than one root element, an unescaped ampersand or angle bracket inside text, or a stray character before the XML declaration. The red status message names the first error so you can correct it quickly.

What is the difference between formatting and minifying?

Formatting pretty-prints the document with indentation and line breaks so it is easy to read. Minifying removes the whitespace between elements to produce the smallest possible single-line output. Both preserve the underlying data.

Does it support comments, CDATA, and namespaces?

Yes. Comments, CDATA sections, processing instructions, and namespace-prefixed elements are all preserved in the output, and the XML declaration at the top of the document is kept intact.

Can I beautify an XML sitemap or RSS feed?

Absolutely. Sitemaps, RSS and Atom feeds, SOAP responses, and configuration files are all valid XML, so you can paste them in to validate and pretty-print them just like any other document.