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Overview
Paste your XML and this xml formatter beautifies it into cleanly indented, readable output while checking it’s well-formed as you go - instantly, in your browser, with nothing ever uploaded anywhere. Built for the moment a SOAP payload, RSS feed, or config file lands in your clipboard as one unreadable line and you need it scannable in the next ten seconds, not routed through a server first.
Best for: Cleaning up SOAP payloads or RSS feeds for readability
How to use this tool
- Paste your XML. A SOAP payload, RSS feed, or config file all work the same way.
- Parser checks well-formedness. The browser’s own XML parser flags unclosed tags, mismatched elements, or invalid characters.
- Get indented output. Valid XML is re-serialized with clean nesting so element structure is easy to scan.
- Copy the result. Grab the formatted XML with one click once it parses cleanly.
Is there a free XML formatter online that’s safe for real config files and SOAP payloads?
Yes - everything runs client-side, so a SOAP payload with real endpoint data, an RSS feed pulled from a private feed URL, or a config file with connection strings never leaves your machine. There’s no upload step to trust and no account required to get a result.
That matters more for XML than it sounds, since XML is disproportionately used for exactly the kind of data people are cautious about - API contracts, enterprise config, exported records from internal systems. Here, the browser’s own XML parser does the parsing and formatting, the same as opening the file in a local editor, just with clean indentation and instant error checking added.
Does this tool validate XML, not just format it?
Yes - it checks well-formedness as you type using the browser’s native XML parser, which means it enforces the same rules any XML consumer would: a single root element containing everything else, and tags that are case-sensitive and properly nested with no overlaps. If any of those rules break, the tool reports it immediately rather than guessing at a fix.
That immediate, no-guessing behavior isn’t a design choice specific to this tool - XML processors are required by the spec to stop and report an error the moment well-formedness breaks, rather than trying to recover and continue like an HTML parser would. So an XML error here isn’t the tool being strict for no reason; it’s the same hard stop any real XML consumer - an API, a build pipeline, a config loader - would hit on the same file.
Worth knowing: this checks well-formedness, not conformance to a specific schema. XML that’s validly structured can still fail against a particular DTD or XSD your system expects.
How do you actually format or beautify a messy XML file?
Paste the XML into the input panel and it’s re-indented automatically as you type, with a choice of 2-space or 4-space indentation to match your project’s convention. There’s no button to press or format to pick - the moment valid XML lands in the box, clean output appears on the other side.
Because the output is generated from a real parsed structure rather than pattern-matching the text, the same clean result comes out regardless of how inconsistently the source was written - mixed indentation, no line breaks at all, or a single-line minified export all resolve to the same readable style.
Working with markup instead of data - HTML rather than XML? The HTML Formatter & Beautifier does the same clean-indentation job for HTML. And if you’ve converted XML to YAML and want to clean up the result, there’s no need to hand-edit the converter’s raw output - you can format the YAML directly instead.
Comparison
| Feature | What it does | When to use it |
|---|---|---|
| Format / Beautify | Re-indents XML with clean nesting (2 or 4 spaces) | Reading a minified SOAP payload, RSS feed, or config export |
| Well-formedness check | Flags unclosed tags, mismatched elements, invalid characters | Debugging XML that a parser or API is rejecting |
| Adjustable indentation | Toggle between 2-space and 4-space output | Matching your project’s existing formatting convention |
Why use this tool
Real parser, not regex
Uses the browser’s native XML parser, the same engine that would reject malformed XML in production.
Specific error feedback
Well-formedness errors are surfaced clearly instead of silently producing broken output.
Adjustable indentation
Toggle between 2 and 4 spaces to match your project’s formatting convention.
No schema required
Checks well-formedness only, so you don’t need a DTD or XSD on hand just to clean up markup.
Frequently asked questions
No - this tool checks that your XML is well-formed (properly nested, closed tags, valid syntax), not that it conforms to a specific schema. XML that passes here can still fail validation against a particular XSD or DTD.
Common causes include an unclosed or mismatched tag, an attribute value missing quotes, multiple root elements, or invalid characters like a bare "&" that isn’t part of an entity reference.
The formatter re-serializes the parsed element tree, so the output focuses on element structure and text content - comments and processing instructions outside the document element may not be reproduced in the formatted output.