XML Formatter & Validator Online Free
Format, validate, and pretty-print XML. Also converts XML to JSON. Browser-based.
🔒 Your file never leaves your browser. All processing uses the built-in DOMParser.
How to Format XML Online
- 1
Paste your XML
Paste raw or minified XML into the input box.
- 2
Format or convert
Click Format to pretty-print with indentation. Click Minify to produce one-line XML. Use the XML to JSON tab to convert.
- 3
Copy the output
Click Copy to copy the formatted result to your clipboard.
XML remains the backbone of formats you cannot avoid: RSS and Atom feeds, SVG images, sitemaps, SOAP payloads, Maven and Android build files, Office document internals, and countless enterprise integrations. The problem is that machine-generated XML almost always arrives as a single unreadable line. Formatting it is the difference between scrolling helplessly and actually seeing the document's structure.
Validation built in:unlike a plain pretty-printer, this tool parses your document with the browser's native DOMParser first. Unclosed tags, mismatched nesting, illegal characters, and broken entities are reported as errors instead of silently producing mangled output — making this a quick well-formedness check before you feed a file to a stricter system.
What survives formatting: namespace declarations, attributes in their original order, CDATA sections, and processing instructions all pass through intact. Only inter-element whitespace changes. Note that if your XML uses whitespace-significant mixed content (rare outside document formats), re-indentation can alter it.
XML to JSON: the conversion tab produces an approximate JSON representation — useful for exploring a payload in JavaScript. It is approximate by necessity: XML attributes, repeated sibling elements, and mixed content have no exact JSON equivalent. For the reverse direction and richer options, see the JSON formatter and YAML to JSON converter.