XML Formatter & Validator

About this xml formatter

XML remains a cornerstone of data interchange, configuration management, and enterprise systems across industries. Whether you're debugging malformed XML, validating against schemas, or transforming data, our comprehensive XML formatter and validator handles all your XML processing needs in one intuitive tool. This free online XML formatter eliminates the pain of working with unformatted, minified, or complex XML documents by providing instant formatting, validation, and analysis capabilities right in your browser.

Beyond basic formatting, this XML validator combines multiple essential features: validate XML against XSD schemas, test XPath expressions to locate and extract data, transform XML documents with XSLT, and convert XML to JSON format for easier integration with modern APIs and applications. Each feature is designed for developers, system administrators, and data specialists who need reliable XML processing without installation requirements or complex configuration.

The XML beautifier automatically indents and colorizes your XML, making nested structures instantly readable. Whether your source is a single-line minified XML response from an API, a configuration file, or an exported data document, the formatter instantly transforms it into properly structured, easy-to-read format. The integrated pretty-print engine respects XML structure and preserves your data integrity while enhancing readability and maintainability.

Real-world applications span API debugging and testing (format and validate REST and SOAP responses), DevOps workflows (validate Kubernetes manifests and configuration files), data processing (transform and validate EDI documents), and web development (process SVG, XHTML, and XML-based formats). The tool's comprehensive feature set eliminates the need for multiple separate utilities, consolidating XML formatting, validation, transformation, and conversion into a single, efficient workflow.

Security and privacy are paramount when processing sensitive data. All XML processing—formatting, validation, XPath testing, schema checking, XSLT transformation, and JSON conversion—occurs exclusively in your browser with zero server-side storage or transmission, ensuring your confidential configuration files, data exports, and API responses remain completely private and under your control.

How to use this tool

1. 01

   Paste or Upload Your XML

   Copy-paste your XML content directly into the editor, upload an XML file from your computer, or load sample XML to explore the tool's capabilities. The XML parser immediately analyzes your input and provides feedback on structure and validity.

2. 02

   Format and Validate

   Click Format to apply consistent indentation and structure, then use Validate to check against XML standards and optionally verify against an XSD schema. The validator highlights errors with precise line numbers for quick debugging and correction.

3. 03

   Use Advanced Features

   Test XPath expressions to query and extract specific data, run XSLT transformations to restructure your XML, or convert to JSON format for use in JavaScript applications and modern REST APIs.

4. 04

   Copy or Download Results

   Copy formatted output to your clipboard with one click, or download as a file for local use. Share results or maintain your processed XML in your project.

Worked examples

<?xml version="1.0"?><root><item id="1"><name>Product A</name><price>29.99</price></item><item id="2"><name>Product B</name><price>49.99</price></item></root>

<?xml version="1.0"?>
<root>
  <item id="1">
    <name>Product A</name>
    <price>29.99</price>
  </item>
  <item id="2">
    <name>Product B</name>
    <price>49.99</price>
  </item>
</root>

<?xml version="1.0"?><config><database><host>localhost</host><port>5432</port><user>admin</user></database></config>

{"config":{"database":{"host":"localhost","port":"5432","user":"admin"}}}

<?xml version="1.0"?><library><book id="1"><title>XML Guide</title><author>John Doe</author></book><book id="2"><title>Data Processing</title><author>Jane Smith</author></book></library>

XPath: //book[@id="1"]/title returns "XML Guide"; //author returns 2 matched nodes

Limits and edge cases

• XML validation checks well-formedness (proper nesting, matching tags, valid characters) and optionally validates against XSD schemas you provide for strict compliance verification.
• XPath testing supports common expressions like //element-name for recursive descent, @attribute-name for attributes, predicates like [@id='value'], and path navigation with / and //.
• All processing is instantaneous and local to your device; no data is transmitted to external servers, logs, or storage systems at any point during formatting, validation, or transformation.

Standards and references