XML Formatter & Validator — Free Online Tool
Paste any XML — API responses, config files, RSS feeds, SOAP envelopes — and instantly pretty-print it with consistent indentation, or minify it for production. The validator uses the browser's native DOMParser to report the exact line and column of syntax errors. Namespaces, CDATA sections, XML declarations, and processing instructions are preserved verbatim through all operations.
100% client-side. No uploads. Your data never leaves your browser.
How to use XML Formatter & Validator
- Paste your XML into the input area or select an example preset.
- Choose an indent style — 2 spaces, 4 spaces, or Tab.
- Click 'Format XML' to pretty-print, 'Minify' to compact, or 'Validate' to check syntax only.
- Copy the output or download it as formatted.xml.
Frequently Asked Questions
Does this send my XML to a server?
No. Parsing and formatting run entirely in your browser using the native DOMParser and XMLSerializer APIs. Nothing is transmitted anywhere.
What is the difference between formatting and minifying XML?
Formatting adds consistent indentation for human readability. Minifying removes all non-significant whitespace to produce the smallest valid XML payload.
Can this handle namespaces and attributes?
Yes. Namespace prefixes (xmlns:prefix) and all attributes are preserved exactly through formatting and minification.
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