XML Validator Online
Check if your XML is well-formed and find the exact line and column of the first error. Free, in your browser, nothing is uploaded.
How to use the XML Validator Online
Validate, beautify and clean JSON, CSV, XML and YAML.
- Paste or upload your data
- Choose the options
- Copy or download the result
Tips
- Invalid JSON shows the exact line and column. “Auto-fix” repairs comments, trailing commas and single quotes.
- Numbers and key order are kept exactly as written – nothing is rounded.
- CSV: any delimiter is detected automatically; pick the one you want for the output.
- YAML: comments are kept, and you can convert YAML → JSON or paste JSON to get YAML.
Example
Input: <a><b></a>
Output: Error at line 1: mismatched closing tag </a>
Frequently asked questions
How do I know if my XML is well-formed?
Paste it in. If a tag is not closed or nested correctly, the first error is shown with its line and column.
Does it check against an XSD schema?
No. It checks that the XML is well-formed, not that it follows a particular schema.
Guides