XML Validator

Validate XML well-formedness with exact line and column diagnostics, automatic error reveal, lightweight structure preview, and direct handoff into the formatter and viewer.

Waiting for XMLInput: 361 BAuto-validate: on
All processing happens locally in your browser. No data is uploaded or stored.

How to Use

  1. Paste XML into the input panel or upload a local XML file.
  2. Use auto-validate for smaller inputs or click Validate XML manually for larger documents.
  3. Read the exact line and column diagnostics, inspect the snippet, and use the quick fix checklist to resolve syntax issues.
  4. Once the XML is valid, inspect the structure preview or open the same XML directly in XML Formatter And Beautifier or XML Viewer.

Related Tools

XML Formatter And BeautifierXML MinifierXML ViewerXML to XSD ConverterXML to JSONXML to YAML ConverterYAML to XML ConverterJSON to XML

Frequently Asked Questions

Does the XML Validator support XSD or DTD validation?

Not in this first release. V1 focuses on XML well-formedness with exact line and column diagnostics, lightweight structure preview, and local-only processing.

How are XML errors shown?

The validator highlights the failing line, marks the reported column, scrolls the editor to the error automatically, and shows a likely-cause explanation with a focused snippet.

Can I inspect valid XML after validation succeeds?

Yes. Valid XML gets a lightweight structure preview here, and you can open the same XML directly in XML Formatter And Beautifier or XML Viewer for deeper follow-up work.

Is my XML uploaded anywhere?

No. Validation, diagnostics, and structure preview all run locally in your browser.

What happens with very large XML files?

Large XML switches to manual validation and worker mode so the editor and preview remain responsive.