XML Formatter & Validator
Format, validate, and minify XML documents with custom indentation — runs entirely in your browser.
Ready
Input
Formatted output
How to use it
- 1Paste XML into the left panel, or click Sample XML to load a demo document.
- 2Choose Format to pretty-print with your chosen indentation (2 spaces, 4 spaces, or tab), or Minify to collapse to a single compact line.
- 3If the XML has a syntax error, the right panel shows the parser's error message with the problem highlighted.
- 4Copy the formatted or minified output using the Copy button in the output panel header.
Common use cases
- Pretty-print an API response or config file that arrived as a single minified XML line.
- Validate a hand-written XML document before committing it to a repository or API endpoint.
- Minify an XML payload to reduce its size before embedding it in a request body or a test fixture.
- Inspect the structure of an unfamiliar XML document — indented output makes nesting immediately visible.
- Prepare a SOAP envelope or RSS feed for review without opening a desktop XML editor.
Frequently asked questions
- Does it validate the XML?
- Yes — the browser's built-in DOMParser validates well-formedness (proper nesting, closed tags, correct attribute quoting). It does not validate against a DTD or XML Schema — that would require a schema file.
- Is my XML uploaded anywhere?
- No. Parsing uses the browser's native DOMParser API — your XML is processed locally and never leaves your device.
- What does Minify do?
- It validates the XML first (to catch errors), then removes all whitespace between tags and collapses internal whitespace. The result is a single compact string — useful for embedding in JSON, query parameters, or test fixtures.
- Does it support XML namespaces and attributes?
- Yes. Namespaces, prefixes, and attributes are preserved exactly as-is — the formatter only changes whitespace and indentation, not any actual content.
- Can it handle very large XML files?
- For most practical files (tens of kilobytes to a few megabytes) it's instant. Very large files (tens of megabytes) may pause the browser tab briefly since DOMParser holds the full document in memory.
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