What is the difference between well-formed and valid XML?
Well-formed XML follows the basic XML syntax rules. Valid XML also conforms to an external vocabulary or schema, such as a DTD or XSD.
How to Use XML Validator & Formatter
Step 1: Paste XML
Paste your raw XML code or upload an XML document.
Step 2: Validate & Indent
The native DOMParser tests tree structure and validates tag pairs.
Step 3: Copy Clean XML
Copy the beautified, validated XML.
Key Features & Capabilities
- Precise line-by-line syntax error diagnostics
- Beautify XML with customizable 2-space or 4-space indentation
- Safe local parsing
Specifications & Limits
- Supported Formats: .xml, .txt, .svg
- Max File Size: 10 MB
- Batch Processing: Single Item
- Free Tier Limit: Full in-browser XML DOM parser validation
Frequently Asked Questions
Can this validator check an XSD?
The current tool metadata describes DOM-based syntax validation and formatting. XSD validation is listed as a separate future/pro capability rather than the core browser validator.
Why does an ampersand cause an XML error?
A raw `&` can begin an entity reference. When it is meant as ordinary text, it may need the appropriate escaped form.
Does it work with SVG files?
Yes, SVG is XML-compliant and can be validated and formatted directly.
Related Tools
- YAML Validator & Formatter — Check YAML syntax, validate indentation levels, and convert YAML to JSON.
- JSON Formatter & Validator — Beautify, minify, validate, and repair JSON data with syntax highlighting.
- HTML Minifier — Minify HTML markup, strip comments, and remove redundant whitespace.