XML Formatter & Validator
Format, validate, and minify XML instantly in your browser.
XML still underpins a huge amount of enterprise software, configuration files, RSS/Atom feeds, and API responses in industries that moved to JSON more slowly than the web at large, and — much like JSON — a raw XML payload with no indentation is nearly unreadable, while a single mismatched or unclosed tag can silently break a downstream parser.
This tool formats XML into a clearly indented, readable tree structure and validates tag nesting as it goes, catching mismatched closing tags and unclosed elements with a specific error message rather than a generic failure. The minify option strips whitespace between tags to produce the smallest possible payload, useful for embedding XML in a size-constrained field or transmitting it efficiently.
Validation here checks well-formedness (correct tag nesting and closure) rather than validating against a specific schema (DTD or XSD) — if you need schema-level validation, a dedicated schema validator is a separate tool from formatting.
How to use XML Formatter & Validator
- 1
Paste your XML
Paste or type your raw XML into the input box.
- 2
Click Format & Validate
The tool checks tag nesting and either shows a formatted result or a specific error.
- 3
Copy the result
Use Copy result to grab the formatted (or minified) output.
Features
- Runs entirely client-side — your XML never leaves your browser
- Catches mismatched and unclosed tags with specific error messages
- One-click minify for compact XML payloads
- No file size limit imposed by a server upload
Frequently asked questions
Common mistakes to avoid
- Forgetting to close a self-contained tag with a trailing slash (e.g. <br/> instead of <br>) in strict XML contexts.
- Assuming XML well-formedness validation also checks against a specific schema — it doesn't.
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