XML Formatter & Validator

Free XML Formatter & Validator

Paste any XML document into the field above and click Format / Validate to check if it is well-formed and get nicely indented output. If the XML is invalid, an error message will tell you exactly what went wrong and where. This free online XML formatter and validator works entirely in your browser — no data is sent to any server.

What Is XML Validation?

XML validation checks whether an XML document is well-formed — meaning it follows the XML specification rules. A well-formed XML document must have properly nested and closed tags, quoted attribute values, a single root element, and correct syntax. Any XML parser can process a well-formed document, making validation a critical first step before consuming or transforming XML data.

What Does XML Formatting Do?

XML formatting (also called XML beautification or pretty-printing) adds consistent indentation and line breaks to a compact XML document, making it easy to read, navigate, and debug. This is especially useful when working with API responses, configuration files, or data exports that arrive as a single line of text.

How to Use This XML Formatter

1. Paste your XML document into the input field — minified, messy, or already formatted.
2. Click Format / Validate to check for errors and get beautified output.
3. Copy the formatted XML with the copy button.

Common Uses

• Validating XML API responses before processing them in your application
• Beautifying minified XML from third-party web services for debugging
• Checking sitemap.xml, RSS feeds, and Atom feed structure for SEO
• Verifying XML configuration files for applications and frameworks
• Formatting SOAP request and response bodies for API documentation