XML Formatter Online
Beautify and validate XML with syntax highlighting. Minify XML to reduce payload size. Error detection with line numbers.
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About XML Formatter & Validator Online
Validate, beautify, and minify XML with error detection. Supports both formatting (adding indentation) and minification (removing whitespace). Error messages include line numbers. All processing client-side.
XML remains widely used in enterprise systems, SOAP APIs, RSS/Atom feeds, configuration files, and many legacy systems that predate JSON's dominance, and minified or poorly-indented XML is just as hard to debug as minified HTML — a single unclosed tag can break parsing, and finding it in a dense block of unformatted markup wastes real debugging time. This tool validates XML syntax and reports errors with line numbers, re-indents it with proper nesting for readability, and can minify formatted XML back down when a compact payload is needed for transmission. It's built for developers working with SOAP services, RSS feeds, or any system where XML is still the format of record.
How to use
- Paste or type your input directly into the editor — output updates in real time as you work.
- Check the error/status indicator if your input is invalid; it points to the exact line or issue where relevant.
- Use the copy or download button to grab the processed output once it looks right.
- Chain into a related tool below if your workflow needs a second processing step.
- Processing happens entirely client-side in your browser — nothing you paste is uploaded to a server.
Tool details
⚡ Next step — complete your workflow
Frequently asked questions
Common XML errors?
Unclosed tags, case-mismatch (XML is case-sensitive), special chars not escaped (& < > " '), multiple root elements, missing XML declaration.
XML vs JSON — which to use for APIs?
JSON is now preferred for REST APIs (smaller payload, native JS parsing). XML is still used in SOAP services, configuration files, and RSS feeds.
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