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Tools

XML Formatter & Validator

Working with XML configs, SOAP responses, or SVG files? Paste your XML to instantly validate well-formedness, format with proper indentation, or minify for transmission. The validator pinpoints unclosed tags, mismatched elements, and encoding issues with exact line numbers.

XML Formatter & Validator

How to Use This Tool

  1. Paste or upload your XML content into the editor.
  2. Validation runs automatically — errors appear with line references.
  3. Click "Format" to beautify with configurable indentation.
  4. Click "Minify" to strip whitespace for production.

Features

  • Well-formedness validation with precise error locations
  • Prettify with configurable indent size
  • Minify/compress by removing insignificant whitespace
  • Detects: unclosed tags, mismatched elements, invalid characters, encoding issues
  • Namespace-aware validation
  • Syntax highlighting with collapsible element tree
  • XPath display on element click

Example

Prettify inline XML

Transform single-line XML into readable indented format.

Sample

<catalog><book id="1"><title>Clean Code</title><author>Robert Martin</author></book></catalog>

What you get

<catalog> <book id="1"> <title>Clean Code</title> <author>Robert Martin</author> </book> </catalog>

Detect unclosed tag

Invalid XML with missing closing tag is flagged precisely.

Sample

<root><item>Hello</root>

What you get

Error at line 1: Opening tag "item" is never closed. Expected </item> before </root>.

Frequently Asked Questions

What is the difference between well-formed and valid XML?
Well-formed XML follows basic syntax rules (proper nesting, closed tags, quoted attributes). Valid XML additionally conforms to a DTD or XML Schema. This tool checks well-formedness. For schema validation, you need to provide an XSD file.
Does the formatter handle XML namespaces?
Yes. Namespace declarations (xmlns) and prefixed elements are preserved during formatting. The validator also checks that namespace prefixes are properly declared.
Can it handle CDATA sections and comments?
Yes. CDATA sections, XML comments, and processing instructions are all preserved during formatting and validated for correct syntax. CDATA content is not parsed or modified.
What is the maximum file size?
Processing runs entirely in your browser. Files up to 10 MB format smoothly on modern devices. For larger XML documents, consider using xmllint or a streaming parser.

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