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XML Formatter & Validator

Format, beautify, and validate XML data with customizable indentation. Free, client-side, no signup.

Your data never leaves your browser Available via MCP
Next steps
JSON Formatter → HTML Beautifier → SQL Formatter →

How to Use

  1. Paste your XML into the input panel.
  2. Select your indentation preference (2 spaces, 4 spaces, or tabs).
  3. Click Format to beautify, or Minify to compress.
  4. Click Copy to copy the formatted result.

What Is XML?

XML (eXtensible Markup Language) is a markup language for encoding documents in a format that is both human-readable and machine-readable. Unlike HTML, XML does not have predefined tags — users define their own tag names to describe data structure. XML was designed to store and transport data, and it remains widely used in configuration files, SOAP web services, RSS/Atom feeds, SVG graphics, and enterprise integrations.

XML vs. JSON

JSON has largely replaced XML for web APIs due to its simpler syntax, smaller file size, and native JavaScript support. However, XML remains dominant in areas where its strengths matter: namespaces for mixing vocabularies, schemas (XSD) for strict validation, XSLT for transformations, and XPath/XQuery for querying. Many enterprise systems, financial protocols (FIX, SWIFT), and government standards still require XML.

XML Well-Formedness Rules

  • Every opening tag must have a matching closing tag, or use self-closing syntax (<br/>)
  • Tags must be properly nested — <a><b></b></a> is valid, <a><b></a></b> is not
  • There must be exactly one root element
  • Attribute values must be quoted (single or double quotes)
  • Element and attribute names are case-sensitive
  • Special characters must be escaped: &lt; for <, &amp; for &, &gt; for >

Common XML Formats

  • SVG — Scalable Vector Graphics, used for icons and illustrations on the web
  • RSS/Atom — Syndication feeds for blogs and news sites
  • SOAP — XML-based messaging protocol for web services
  • Maven POM — Project configuration for Java build automation
  • Android layouts — UI definitions in Android applications
  • Office documents — DOCX, XLSX, PPTX are ZIP archives containing XML files

Related Tools

Convert data formats with the JSON to CSV Converter or JSON-YAML Converter. Format JSON or HTML. Validate JSON with the JSON Validator. Compare XML versions with the Diff Checker. Encode XML entities with the HTML Entity Encoder. Format SQL queries that generate XML output.

Frequently Asked Questions

What does this tool do?
This tool formats (pretty-prints) XML by adding proper indentation and line breaks, or minifies XML by removing all unnecessary whitespace. It also validates XML syntax using the browser's built-in DOMParser.
Does this tool validate XML?
Yes. The tool uses the browser's DOMParser to check for well-formedness errors. If the XML is invalid, an error message will be displayed describing the issue and its location.
What indentation options are available?
You can indent with 2 spaces, 4 spaces, or tabs. The default is 2 spaces, which is the most common convention for XML files.
Is my data safe?
Yes. All formatting and validation happens entirely in your browser using the native DOMParser API. No data is sent to any server.

Code Examples

Learn how to use this tool programmatically in your favorite language.

Parse XML

Convert XML to JSON

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Use this tool from AI agents. The CodeTidy MCP Server lets Claude, Cursor, and other AI agents use this tool and 46 others directly. One command: npx @codetidy/mcp

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