DevToolsHub

XML Formatter & Validator

Validate, prettify, and minify XML for SOAP configs, RSS feeds, Android layouts, and enterprise integrations.

Pretty-print before code review so mismatched tags stand out from whitespace noise.

Paste your XML below. Use Validate to check syntax, then Prettify or Minify.

How to use

  1. Paste your XML into the input area
  2. Click Validate XML to check if it's well-formed
  3. Click Prettify to indent and format, or Minify to remove extra whitespace
  4. Use Share URL to copy a link with your XML (?xml= in the URL)
  5. Use Copy to copy the formatted output to the clipboard

1XML remains infrastructure glue

Enterprise SOAP services, RSS feeds, SVG assets, and Android layouts still rely on XML’s explicit structure and mature schema ecosystems.

Formatting does not change semantics, but it does make mismatched tags and forgotten namespaces visible during review.

  • Pretty-print before diffing configuration files checked into version control so reviews focus on values, not whitespace noise.
  • Large XML logs benefit from folding or tree views so you can expand only the subtree you care about.

2Namespaces and attributes

Namespaces prevent collisions when multiple standards combine in one document; keep prefixes consistent to avoid confusing future maintainers.

Attribute order is not semantically meaningful in XML, but stable ordering from a formatter makes textual diffs cleaner.

3Performance mindset

Deeply nested XML can stress naive parsers; if you only need a few fields, streaming parsers beat loading the entire tree into memory.

Validate against XSD or Relax NG in CI when contracts matter—formatting alone does not guarantee conformance.

4Enterprise integration

SOAP, SAML metadata, RSS, and Android resources remain XML-heavy. Formatting helps humans review WSDL and config changes even when machines only care about validity.

5Namespaces in large documents

Default namespaces change how XPath and queries resolve. Keep namespace declarations consistent across files in the same integration suite.

6Quick checklist for XML workflows

Pretty-print before diffing config changes. Validate against XSD or Relax NG in CI when schemas exist.

  • Keep namespace prefixes consistent across files.
  • Stream-parse very large XML instead of loading entire trees in the browser.

Examples

RSS-style snippet

Pretty-print for review before publishing feeds.

<rss version="2.0">
  <channel>
    <title>DevToolsHub</title>
    <item><title>Update</title></item>
  </channel>
</rss>

Config with namespace

Namespaces must remain consistent after formatting.

<root xmlns="https://example.com/schema">
  <setting enabled="true"/>
</root>

Frequently asked questions

Does formatting change XML meaning?
No. Whitespace between tags is generally insignificant for element-only content models, but can matter for mixed content—review if unsure.
Can this validate against XSD?
This tool checks well-formedness and formatting. Schema validation belongs in CI with XSD or Relax NG tools.
Why does validation fail on valid-looking XML?
Unclosed tags, invalid entities, wrong namespace prefixes, or encoding declarations mismatching actual bytes are common causes.
Can I minify XML?
Yes. Minify removes extra whitespace for transport; keep a pretty copy for human review in version control.
Is my XML uploaded?
Processing runs in the browser.

Related tools & guides