XML Formatter & Validator

Format messy XML, validate well-formed markup and minify documents locally in your browser.

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Well-formed XML checks

Catch mismatched tags, invalid nesting and malformed XML before pasting data into an API client, CMS or feed importer.

Readable formatted output

Pretty-print compact XML with two spaces, four spaces or tabs while keeping processing local to your device.

Private local processing

The tool uses browser-native parsing. There is no upload endpoint, server-side queue or stored document copy.

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Frequently Asked Questions

Is my XML uploaded to a server?

No. The XML formatter runs in your browser with DOMParser and JavaScript. Your XML is not uploaded to Convertr servers.

What does the XML validator check?

It checks whether the XML is well-formed, including matching tags, valid nesting and parser errors reported by your browser.

Can this validate against an XSD schema?

No. This browser tool validates XML syntax only. It does not validate documents against external XSD or DTD schemas.

XML Formatter and Validator

Parse, indent, compact, and validate well-formed XML text.

Input
XML text or a local XML file plus indentation options.
Output
Formatted or compact XML with parser diagnostics.
Real limitations
Well-formedness is not schema validation, external entities are not fetched, and formatting can normalize insignificant whitespace.
Privacy and data handling
XML text or a local XML file plus indentation options is processed in this browser tab. Convertr does not receive or store it; closing or reloading the page clears the working state unless the tool explicitly offers a local download.

How to use this tool

  1. Provide XML text or a local XML file plus indentation options in the tool controls.
  2. Choose the settings that affect formatted or compact XML with parser diagnostics, then run the tool.
  3. Review formatted or compact XML with parser diagnostics before copying or downloading it.

Common failure modes

Mismatched tags, invalid characters, duplicate attributes, or unsafe document type/entity content produces an error.

Useful example

Paste a compact XML feed to indent nested channel and item elements by two spaces.