About XML Formatter
Format, indent, and validate XML. Paste minified or messy XML to get a clean, properly nested document, and catch structural errors — all locally in your browser.
How to Use
- Paste your XML.
- The tool indents each nested element.
- Any structural error is reported.
- Copy the formatted XML.
Why Use This Tool?
- Accurate — built on precise, well-tested mathematical formulas.
- Instant — all calculations happen client-side for zero latency.
- Private — no data is sent to any server; your information stays on your device.
- Free — no sign-up, no limits, no hidden costs.
Frequently Asked Questions
Why is my XML invalid?
Common causes are unclosed or mismatched tags, missing quotes around attribute values, or more than one root element. The formatter flags where parsing failed.
What is the difference between well-formed and valid XML?
Well-formed means the syntax is correct (tags nested and closed properly). Valid means it also conforms to a schema (DTD/XSD). This tool checks well-formedness.
Is my XML uploaded anywhere?
No. Formatting and validation run in your browser, so sensitive XML never leaves your device.