XML Formatter & Validator

XML (eXtensible Markup Language) is a markup language designed to store and transport data in a format that is both human-readable and machine-parseable. Unlike HTML, which has predefined tags, XML allows you to define your own tags, making it highly flexible for representing any type of structured data.

Created by the W3C in 1998, XML has become a fundamental technology for data interchange, configuration files, web services (SOAP), document formats (DOCX, SVG), and many enterprise applications. Despite the rise of JSON, XML remains critical in industries like finance, healthcare, and government.

Raw XML from APIs, exports, or legacy systems is often minified or poorly structured. Formatting makes it readable:

• Debugging: Formatted XML reveals the document structure, making it easy to spot nesting issues or missing elements.
• Code Review: Well-formatted configuration files are easier to review and maintain.
• Documentation: Readable XML examples help others understand data structures.
• Comparison: Properly indented XML makes it easier to compare versions or diff files.

1. Paste your XML: Copy your XML document and paste it into the input field above.
2. Choose an action: Click "Format" to beautify, "Minify" to compress, or "Validate" to check syntax.
3. Set indentation: Choose 1, 2, or 4 spaces based on your preference.
4. Copy the result: Use the copy button to copy formatted XML to your clipboard.

Well-formed XML follows these rules:

• Single root element: Every XML document must have exactly one root element containing all other elements.
• Matching tags: Every opening tag must have a corresponding closing tag.
• Proper nesting: Elements must be properly nested—no overlapping tags allowed.
• Case sensitivity: XML tags are case-sensitive. <Name> and <name> are different.
• Attribute quoting: All attribute values must be enclosed in quotes.

Our validator catches these frequent mistakes:

• Unclosed tags: Missing closing tags like <item> without </item>.
• Invalid characters: Unescaped special characters like &, <, and > in content.
• Mismatched tags: Opening and closing tags with different names or casing.
• Multiple root elements: More than one element at the document root level.
• Unquoted attributes: Attribute values without surrounding quotes.

Both formats have their place:

• XML advantages: Supports attributes, namespaces, schemas (XSD), mixed content, comments, and processing instructions.
• JSON advantages: More compact, native JavaScript support, simpler syntax, easier to parse in most languages.
• Use XML when: You need document validation, work with SOAP web services, or deal with document-centric data (like Word or SVG files).
• Use JSON when: Building REST APIs, storing configuration for web apps, or exchanging simple data structures.

These characters must be escaped in XML content:

• Configuration files: Maven (pom.xml), Android (AndroidManifest.xml), .NET (web.config).
• Data interchange: SOAP web services, RSS feeds, Atom feeds.
• Document formats: Microsoft Office (DOCX, XLSX), OpenDocument, SVG graphics.
• Industry standards: XBRL (finance), HL7 (healthcare), XMPP (messaging).
• Build systems: Ant, Maven, MSBuild project files.

This XML formatter runs entirely in your browser using JavaScript. Your XML data is never sent to any server, stored, or logged. This makes it safe to use with sensitive configuration files, API responses, or proprietary data formats.