XML Tools

XML Validator

XML Validator — check XML for well-formedness and report the first error. It runs entirely in your browser, so nothing is uploaded and it works offline.

Client-sideRuns entirely in your browser — your data never leaves your device.

XML Validator is a free XML Tools utility that runs entirely in your browser — nothing you enter is uploaded.

XML input
Validation result



  
How to use XML Validator

  
    
      
  1. Start by adding the XML you want to validate into XML Validator.
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  2. Watch the output update instantly while you adjust the XML.
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  3. Finish by choosing Copy to take the output with you.
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About this tool

  
There is no server behind XML Validator. XML Validator works on the XML you paste locally, keeping your markup intact while it processes it.

  
Well-formedness issues are flagged so you can fix structure quickly. Your input never leaves the page, and no account or install is required.

  
Frequently asked questions

  

      
How do I use XML Validator?
XML Validator runs entirely on your device: add your input, and it validates it locally in real time.

      
Does XML Validator cost anything?
No — XML Validator is completely free, with no sign-up and no hidden limits.

      
Is my input private in XML Validator?
Yes — your input never leaves your device; XML Validator does all the work in your browser.

      
Does XML Validator preserve attribute order and namespaces?
XML Validator works on the XML you paste locally and keeps your markup intact while it validates it.

      
Does XML Validator work on mobile?
Yes — XML Validator is just a web page and runs on any modern browser, including phones and tablets.

  

  
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