XSLT Online — Free XSLT Editor, Tester, Viewer & Validator

XSLT Playground is the most powerful free online XSLT tool available — an editor, tester, viewer and validator in one. Unlike every other online XSLT tester, it supports XSLT 1.0, XSLT 2.0, and XSLT 3.0 via Saxon HE 12.5 — the same enterprise-grade processor used in production applications worldwide. Run any XSLT transformation online and see the result instantly. No installation, no account, no limits.

Transform XML with XSLT Online — XSLT 1.0, 2.0 and 3.0

Whether you need to transform XML to HTML, XML to XML, or XML to plain text, XSLT Playground handles it all. Paste your XSLT stylesheet and XML input, and results appear in milliseconds — powered by a real Saxon backend, not a browser polyfill.

The tool supports all three XSLT versions in a single editor. Switch between XSLT 1.0, 2.0 and 3.0 with one click. Perfect for testing stylesheets across versions or learning the differences between the standards.

XSLT Viewer, Validator and Transformation Tool

XSLT Playground works as an online XSLT viewer: paste a stylesheet and an XML document to view the formatted transformation output, with syntax highlighting and a live HTML preview when your stylesheet uses method="html". It is also a full XSLT validator — invalid stylesheets are flagged with the exact line number and the original Saxon error message, so you can validate XSLT online before deploying it to production.

Every XSLT transformation online runs against a real Saxon backend in milliseconds. There is nothing to install and nothing to configure: open the editor, paste your code, and the result appears automatically as you type.

How to Use the Online XSLT Tester

1. Open the editor at xsltplayground.com
2. Paste or type your XSLT stylesheet in the left panel
3. Add your XML input in the Data Pipeline panel
4. Select your XSLT version (1.0, 2.0, or 3.0) from the dropdown
5. The transformation runs automatically — results appear under 100ms
6. Share your transformation with a single shareable link

Why XSLT Playground is Better Than Other Online XSLT Tools

• XSLT 3.0 support — maps, arrays, streaming, higher-order functions, JSON output. No other free online tool offers this.
• XSLT 2.0 support — grouping (xsl:for-each-group), regular expressions, multiple output documents, XPath 2.0.
• Real Saxon processor — Saxon HE 12.5 on the server, not a simplified browser implementation. Results match production exactly.
• Built-in XSLT validator & viewer — validate stylesheets with exact line-number errors and view formatted output with a live HTML render preview.
• Multiple XML inputs — pass multiple documents as named parameters, just like in production pipelines.
• Execution trace — debug your stylesheet step by step, inspect variable values at runtime.
• Multiple workspaces — save up to 3 workspaces locally, no account needed.
• Import/Export — save and share complete workspaces as JSON files.

XSLT Online — Frequently Asked Questions

Does this XSLT tester support XSLT 3.0?

Yes. XSLT Playground is one of the very few free online tools that fully supports XSLT 3.0 via Saxon HE 12.5. You can use maps, arrays, xsl:merge, xsl:on-empty, higher-order functions, and all XSLT 3.0 features.

What XSLT processor does it use?

The backend uses Saxon HE 12.5, the open-source edition of Saxonica's Saxon processor — the industry standard for XSLT 2.0 and 3.0 processing, trusted by enterprises globally.

Can I transform XML to HTML online?

Yes. Write an XSLT stylesheet with method="html" and XSLT Playground shows a live rendered HTML preview alongside the source output.

What is the difference between XSLT 1.0, 2.0 and 3.0?

XSLT 1.0 (1999) is the original standard. XSLT 2.0 (2007) adds grouping, regular expressions, multiple output documents, and XPath 2.0. XSLT 3.0 (2017) adds streaming, maps, arrays, higher-order functions and JSON support. XSLT Playground supports all three.

Can I view and validate XSLT output online?

Yes. XSLT Playground is an online XSLT viewer and validator: it shows formatted output with syntax highlighting and a live HTML preview, and reports the exact line number and Saxon error message when a stylesheet is invalid.

Is XSLT Playground free?

Yes, completely free. No account, no signup, no installation required. Workspaces are saved locally in your browser.