XML Formatter & Validator
Pretty-print and validate XML with entity-safe local parsing.
Browser onlyYour data never leaves this device.
Runs entirely in your browser. Your data never leaves this device and is never stored.
Details: Privacy policy
Input
External entities are never resolved.
Result
No input yet.
Paste XML above to validate it.
XML Formatter & Validator pretty-prints pasted markup and explains why a malformed document failed, parsing everything locally where external entities cannot resolve. It serves developers inspecting a minified feed or configuration file, integrators confirming an export is well-formed before importing it, and anyone who needs a readable diff of markup produced by another system. Well-formedness is strict — a mismatched or unclosed tag is an error rather than a guess — and only the first fault is reported so the message stays actionable. Attribute values, text content and comments are preserved while inter-element whitespace is normalised, and the output is written as UTF-8 with a fresh declaration. Because parsing never resolves external entities, XXE-style attacks cannot trigger here. Compare the formatted copy with the original when a partner reports a difference, because normalised whitespace sometimes reveals a real change. Namespaces are preserved exactly as written, and attribute quoting is left untouched. Indentation uses spaces, while the compact option strips the whitespace between elements. Nested elements indent one level deeper, so the structure reads clearly at a glance.
Key facts
- Input
- XML
- Output
- Indented or compact XML, re-declared as UTF-8
- Limits
- Output normalizes to UTF-8 with a fresh declaration.
- Processing
- In your browser — nothing is uploaded
- Sign-up
- Not required
- Cost
- Free
Limits above are read from the same code that enforces them; formats are the ones the tool accepts and produces.
How to use XML Formatter & Validator
- Paste XML and pick pretty or compact output.
- Fix any reported well-formedness error.
- Copy, download, or clear to start over.
What you get
- Pretty-printed or compact XML, normalised to UTF-8 with a fresh declaration.
- A precise error naming the first well-formedness fault when parsing fails.
- Copy and download actions for the formatted document.
When to use XML Formatter & Validator
- Readable-ify a minified feed or config before editing it.
- Confirm an export is well-formed before importing it elsewhere.
- Compare two systems' markup by formatting both copies first.
Frequently asked questions about XML Formatter & Validator
Does XML Formatter upload my data?
No. Parsing and formatting run locally in your browser; nothing is sent, stored, or logged.
Are external entities resolved?
Never. Browser XML parsers do not fetch external entities, so XXE-style attacks cannot trigger here.
What counts as invalid?
Anything not well-formed: mismatched tags, unclosed elements, or bad nesting. The first fault is reported.
Does formatting change my data?
Only whitespace between elements. Text content, attributes, and comments are preserved.
Guides that compare XML Formatter & Validator
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