FreeDev Tools

XML Validator

Check XML well-formedness — unclosed tags, attribute errors, and encoding issues with line numbers.

Runs locally in your browser. Your input is not uploaded.

How to Use

  1. 1

    Paste your XML

    Any XML document — config, feed, SVG, SOAP.

  2. 2

    Read the verdict

    Well-formed, or the first error with line and column.

  3. 3

    Fix and re-check

    Errors update live as you edit the input.

Frequently Asked Questions

Well-formedness: every tag closed and properly nested, attributes quoted, entities legal, one root element — using the fast-xml-parser validation engine, with the exact line and column of the first error.

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