XML Validator

When to use?

Use it to quickly find format errors in XML from APIs, config files, RSS or SVG. It checks that tags, nesting and quotes are correct, and outputs nicely indented XML when valid.

How to use

• Paste the XML to check.
• Review the valid/invalid result and any error message.
• Copy or download the tidied XML.

Input Explanation

Enter the XML document to check. The XML declaration (<?xml … ?>) is optional.

Calculation Basis

It parses the XML with the browser DOMParser and detects parsererror to judge well-formedness, then re-emits the DOM with indentation.

Usage Examples

• API & config checks - Catch syntax errors in XML responses or config files before deploying.
• XML tidy-up - Indent minified XML for readability.

Examples

• Missing closing tag → error message shown
• Valid XML → element count and tidied output

Cautions

• This checks well-formedness only — it does not validate against DTD or XSD schemas.
• Tidying normalizes whitespace, so output may not be byte-identical to the original.

FAQ

Does it validate against a schema (XSD)?

No — only structural well-formedness (tags, nesting, quotes).

Can I see the error location?

Yes — the browser parser’s error message (location and cause) is shown.

Is my data uploaded?

No. All checks run only in your browser.

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