XML Validator & Formatter
Paste XML to validate, prettify, and minify in one place. Diagnose parser errors, inspect syntax-colored markup, and export copy-ready output for SEO, API, and enterprise workflows.
XML validation will run once the browser is ready
<class="text-emerald-600 font-medium">note>
<class="text-emerald-600 font-medium">to>Taylor</class="text-emerald-600 font-medium">to>
<class="text-emerald-600 font-medium">from>Stilest</class="text-emerald-600 font-medium">from>
<class="text-emerald-600 font-medium">heading priority="high">Reminder</class="text-emerald-600 font-medium">heading>
<class="text-emerald-600 font-medium">body>
Remember to validate your XML payloads before sending them to production APIs!
</class="text-emerald-600 font-medium">body>
</class="text-emerald-600 font-medium">note>Our XML validator and formatter simplifies debugging feeds, API requests, and enterprise integrations. With instant error feedback and formatter controls, you can iterate on your markup without leaving the browser or installing heavyweight IDE plugins. Use it when QA testing sitemap updates, crafting RSS/Atom feeds, building SOAP payloads, or reviewing XML generated by marketing platforms and CRMs.
Common Jobs Solved with the XML Validator
- ✓API contract validation
Test SOAP envelopes, XML-RPC payloads, and webhook responses before hitting production endpoints.
- ✓SEO sitemap checks
Ensure your sitemap.xml or RSS feed is well-formed before submitting it to Google Search Console or Bing Webmaster Tools.
- ✓CMS template debugging
Developers working with WordPress, Drupal, or headless CMS feeds can diagnose namespace or escaping issues quickly.
- ✓Enterprise data exchange
QA analysts can validate XML-based EDI files, manifests, and B2B integrations between legacy systems.
- ✓Education & workshops
Teachers and students can visualize XML structure, indentation, and attributes while learning markup fundamentals.
- ✓Automation scripts
Ops teams can spot malformed XML generated by cron jobs, exports, or ETL pipelines prior to downstream failures.
Why Engineers Trust This XML Tool
Detailed parser diagnostics
Instantly surface parser errors with line numbers and helpful messages for missing tags, invalid characters, or namespace mismatches.
Adjustable indentation
Customize indentation spacing so formatted XML matches team style guides and reduces diff noise in version control.
Syntax-highlighted preview
Inspect color-coded tags, attributes, and comments to spot nesting issues faster than raw plain-text views.
One-click minify
Toggle between human-readable and compact XML to ship lightweight payloads over the wire or embed into configuration files.
Clipboard & export shortcuts
Copy formatted or minified XML to your clipboard without losing whitespace or accidentally copying parser errors.
Auto-validation mode
Validate XML while typing so broken markup is caught before uploading files or triggering CI jobs.
How to Validate and Format XML Online
- Paste your XML: Drop raw XML into the editor to trigger instant validation.
- Review error details: If issues exist, inspect the line number and message to fix closing tags or typos.
- Adjust indentation: Set your preferred indentation size and click Prettify XML for a clean layout.
- Minify if needed: Generate a compact version when embedding XML into build pipelines or config values.
- Copy or download: Copy formatted/minified output to the clipboard or download the minified payload.
Best Practices for XML Debugging
XML feeds power publication syndication, eCommerce catalogs, and server-to-server integrations. A single unescaped ampersand or missing closing tag can break an entire workflow. Pair this validator with schema validation, unit tests, and monitoring to guarantee reliable data exchange.
- Escape special characters: Replace & with &, < with <, and > with > inside text nodes.
- Validate feeds before publishing: Broken RSS or sitemap files can cause SEO regressions overnight.
- Track namespace usage: Ensure elements use the correct prefixes and URIs for third-party APIs.
- Automate tests: Add XML checks to CI/CD pipelines so malformed payloads never reach production.
Frequently Asked Questions
Does this XML validator check against an XSD schema?
This tool focuses on well-formedness (syntax) checks. For XSD validation, upload your schema to popular command-line tools like xmllint or integrate with IDE validators.
Can I beautify XML with custom indentation?
Yes. Choose the number of spaces per indent and click Prettify XML. The formatted preview updates instantly with your preferred width.
Will my XML be uploaded to Stilest servers?
No. Everything runs locally in your browser. You can validate sensitive API responses or PII-laden feeds with confidence.
Can I minify XML for production?
Absolutely. Use the Minify button to compress whitespace and inline the result directly into config files or payloads.
Does it support large XML files?
Modern browsers handle thousands of lines easily. For extremely large feeds, consider streaming validators or command-line utilities.
How do I copy the formatted output?
Click Copy formatted or Copy minified. The tool writes the selected version to your clipboard instantly.