XML/JSON editor and XML validator tool for Windows®

XML ValidatorBuddy is your set of workflow tools to edit, validate, transform and manage even a large number of XML and JSON documents. The unique File Explorer with XML related enhancements enables everyone to work with XML and JSON technologies in a convenient and efficient way.

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Manage XML data Manage your XML data with ease

Get these benefits with XML ValidatorBuddy

  • XML Editor
  • Easy to use XML validator
  • Edit and validate huge XML
  • Sign XML with Digital Signatures
  • Schematron Editor & validation
  • JSON Editor
  • Convert CSV to JSON or XML
  • JSON well-formed checking
  • JSON auto-completion & syntax-coloring
  • JSON Schema validator


  • XML ValidatorBuddy Desktop

    XML/JSON editor and validator tool.


  • XMLSpy® plugin

    Easy Schematron validation and enhanced W3C validation. Get all validation errors at once.


  • Command-line XML tool

    Easy to use XML validation from the command-line.



XML ValidatorBuddy 5

Release date: September 19th 2014

New Features:

  • New conversions between XML, JSON and CSV
  • Single-click XML batch validation
  • Add KeyInfo elements to XML Digital Signatures
  • Convert JSON data directly to CSV text
  • JSON Pointer evaluation
JSON auto completion


I like the integration on one screen of the XML instance, the Schematron rules with the easy 'Validate' button and the validation output pane. XML Validator Buddy makes Schematron development easier and faster.

J. Tschumperlin, New Zealand

Perfect to validate my huge (above 3GB) XML data!

Piotr Danowski, Poland

XML/JSON editor and validator tool - Download the 14 days Free Trial now!


March 15th, 2015

Get SHA-2 support with XML ValidatorBuddy 5.1 for XML digital signatures.

September 22nd, 2014

Download XML ValidatorBuddy 5 and get an enhanced and affordable XML editor

February 24th, 2014

Convert JSON to CSV data with XML ValidatorBuddy 4.8

September 25th, 2013

Convert CSV input to JSON or XML with XML ValidatorBuddy 4.6

August 9th, 2013

Improved XML to JSON conversions and JSON pretty-print/remove whitespace functionalities with XML ValidatorBuddy 4.5

June 20th, 2013

XPath Evaluator window and quick generation of XPath expressions for your XML in XML ValidatorBuddy 4.4

February 18th, 2013

XML ValidatorBuddy 4.3 becomes a JSON editor with JSON validation support.

May 9th, 2012

Fill out the user survey and make XML Validator Buddy even better.

November 21st, 2011

Open and validate huge XML with the new Large File Viewer.


  • complete application

    XML ValidatorBuddy Desktop application

  • validation results

    Get all validation errors at once

  • schematron plugin

    Schematron plugin for XMLSpy®