How to validate XML files against a schema?

To validate XML files against a schema, you can use XML ValidatorBuddy to run XSD, DTD, and Schematron checks on individual files, folders, or larger validation batches. You can select a schema from your local system or validate XML with existing schema references and generate detailed result reports.

Is it possible to convert XML files to other formats?

XML ValidatorBuddy can convert XML files to other formats, such as JSON, CSV, and HTML. These conversion tools help when XML validation workflows continue into mixed-format pipelines and when teams need to inspect or troubleshoot data beyond XML alone.

How to sign and verify XML files with digital signatures?

XML ValidatorBuddy can sign and verify XML files with digital signatures using the Sign and Verify commands. You can use your own certificates with the tool. You can also verify multiple XML files at once.

How to format and beautify XML files?

XML ValidatorBuddy can format and beautify XML files using the Format and Pretty-print commands. Formatting is especially useful after validation when you need to inspect, compare, and fix problematic XML more quickly, including for large XML data.

How to generate documentation for XML schemas?

XML ValidatorBuddy can generate documentation for XML schemas using the Generate Schema Documentation command. This command will create an HTML file that contains information about the schema elements, attributes, types, annotations, diagrams, and more.

How to check XML files for well-formedness?

XML ValidatorBuddy can check XML files for well-formedness using the Check XML well-formed command. This command will check if the XML file has a valid syntax and structure. You can also check well-formedness for multiple XML files at once.

Validation-first XML workflows for Windows ®

Use XML ValidatorBuddy to validate, diagnose, and fix XML faster across desktop and automation workflows. Run XSD, DTD, and Schematron checks, handle large XML reliably, verify digital signatures, and keep data correctness at the center of the workflow.

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XML ValidatorBuddy is built for teams that need correct XML data, not just another editor. Validate XML in batches, inspect large XML without turning file size into a blocker, diagnose failures with clear reports, enforce Schematron business rules, and move from interactive debugging to repeatable command-line workflows in one focused tool. Learn more »

Core Workflows

Schema validation Validate XML with XSD, DTD, and Schematron support.
Batch validation Check folders and large XML collections in repeatable runs.
Fix validation failures Use text and grid views to inspect data and repair invalid XML faster.
Large XML handling Validate and inspect multi-GB XML where generic editors fall short.
Automation and CLI Bring XML checks into scripts, CI pipelines, and repeatable validation workflows.
Schematron Enforce XML business rules alongside structural validation.
XML Digital Signatures Verify trusted XML exchanges with SHA-2 signature support.
JSON and conversion support Support mixed XML and JSON workflows without switching tools.

Make data correctness the center of your XML workflow

XML ValidatorBuddy is designed around the XML correctness loop: validate, understand the failure, fix the issue, and run the check again. Instead of burying validation inside a generic editor experience, it gives teams a focused workflow for standards-based XML checking, business-rule enforcement, and follow-up troubleshooting.

Handle large XML and repeatable checks without slowing down

Large XML support, batch validation, and command-line execution make XML ValidatorBuddy a practical tool for serious day-to-day workflows. Whether you are checking a single problematic file or thousands of XML documents in a pipeline, the product is built to keep validation clear, usable, and scalable.

News

October 14th, 2025

New: Get XML ValidatorBuddy completely free for personal or educational use!
The free license includes all features of the Standard edition—validate, inspect, and manage XML and JSON files with no limitations.
Learn more & get your free license

February 16th, 2023

Version 8.2 with support for High-DPI displays and improved user-interface.

December 20th, 2022

Improved JSON to CSV and XML conversions in general and also for large data input.

September 6th, 2021

New version 8 of XML ValidatorBuddy is coming with an optional dark mode user-interface and full support for draft 2019-09 of JSON Schema.

March 7th, 2017

Release of XML ValidatorBuddy 5.4: Usability improvements and an update of the Large File editor: XML editor

November 2nd, 2015

New XML grid editor in XML ValidatorBuddy 5.3

March 15th, 2015

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

September 25th, 2013

Convert CSV input to XML with XML ValidatorBuddy 4.6

August 9th, 2013

Improved pretty-print and remove whitespace functionalities with XML ValidatorBuddy 4.5

Validation workspace for XML correctness tasks

Batch validation results with clear diagnostics

Mixed XML and JSON workflow support

Testimonials

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

J. Tschumperlin, New Zealand

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

Piotr Danowski, Poland

Validation-first XML workflow software with large data support

Validate XML with XSD, DTD, and Schematron in one focused desktop application.
Inspect and work with large XML data without making file size the first problem.
Resolve validation failures quickly with jump-to-error and result-driven investigation.
Batch validator support for XML folders and larger document sets.
Generate reusable reports for troubleshooting and review workflows.
Apply XSLT stylesheets and cross-format tools when validation workflows continue beyond XML.
Free XML validator command-line tool for Windows® automation.

How editing supports faster error diagnosis

XML ValidatorBuddy includes a powerful grid-style editor for XML, but editing is there to support validation workflows. After a failed check, grid and text views help you inspect the affected XML quickly and repair the exact data that caused the problem.

The grid view gives additional overview of XML content and allows quick collapsing and expanding so you can focus on the parts that matter. That makes troubleshooting more approachable for teams who need to fix invalid XML efficiently, even when they are not XML specialists.

Summary

XML ValidatorBuddy is validation-first XML workflow software for teams that care about correct data. It combines schema validation, Schematron business rules, large-file handling, digital signatures, batch processing, and command-line automation in one focused Windows tool. Built-in editing and conversion features help teams diagnose and fix failures faster, but the core promise is reliable XML correctness from desktop debugging to repeatable validation workflows.