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ToolNest AI
Free

XML Validator

Validate XML documents, detect syntax errors with exact line and column locations, and export a full validation report.

task_altPaste or type XML here to validate, or upload a .xml file

About XML Validator

Paste or upload any XML document to instantly validate its structure using the browser's native XML parser. Every syntax error is reported with the exact line number, column, and a clear explanation — no guessing where the problem is. A validation summary shows total errors at a glance, valid documents are confirmed with a green badge, and you can export the validation report as TXT or JSON. Pretty Print reformats the XML for readability. All processing is 100% client-side — your data never leaves the browser.

Frequently Asked Questions

This tool checks whether your XML is well-formed — meaning it has a single root element, all tags are properly opened and closed, attribute values are quoted, and special characters are correctly escaped. Well-formedness is a requirement for any XML document to be processed by software.

Well-formed XML follows the basic syntax rules of the XML specification. Valid XML additionally conforms to a specific schema (DTD, XSD, or RelaxNG). This tool checks well-formedness, which is the first step for any XML document.

Yes. Each error is reported with its line number and column position so you can jump straight to the problem in your editor.

Yes. The tool uses the browser's built-in DOMParser which is highly optimised and handles large documents without any practical size limit.

No. All validation happens entirely in your browser. Your XML is never sent to any server, making it safe to validate sensitive configuration files and data.

Yes. After validation passes, click Pretty Print to auto-indent and format the XML for easy reading.

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