XML Formatter & Validator | Online XML Beautifier & Checker
Format and validate XML instantly with indentation, syntax highlighting, and error detection. Identify unclosed tags, invalid nesting, and malformed XML directly in your browser—no upload required.
How to Use This Tool
- 1
Paste or type XML into the input field.
- 2
Live mode instantly formats and validates XML as you type.
- 3
Manual mode lets you click ‘Format’ to process XML manually.
- 4
Customize indentation (2–4 spaces) and copy or download the formatted result.
Use Cases & Examples
RSS & Atom Feed Validation
Format and validate RSS or Atom feeds before publishing to prevent parser errors.
SVG File Formatting
Beautify and clean SVG markup for easier editing or debugging.
API Response Analysis
Inspect and debug SOAP or REST XML responses by visualizing structure and namespaces.
Configuration File Validation
Check and format XML configuration files for applications and servers.
How XML Formatting and Validation Works
The formatter parses XML using a DOM-based approach, checking for tag closure, nesting, and attribute quoting per XML 1.0/1.1 standards.
It highlights errors with precise line and column references to simplify debugging.
Namespaces, CDATA sections, comments, and processing instructions are preserved exactly.
Schema or DTD validation is not performed—only well-formedness checks are included.
Frequently Asked Questions
Q.Does this detect unclosed or missing tags?
A. Yes, all elements must be properly closed or self-closing (`<tag />`). XML is stricter than HTML and enforces tag closure.
Q.Can I use this for large XML files?
A. Yes. The tool can process XML files of several megabytes within browser memory limits, though extremely large files may take longer.
Q.Why does my XML fail validation?
A. Common XML errors include unclosed tags, invalid nesting, missing quotes, and illegal control characters. The validator highlights line and column positions.
Q.Is my XML uploaded to a server?
A. No data is uploaded or stored. Everything is processed securely in your browser using DOM parsing.
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