About XML Formatter & Validator

Parses, validates, and pretty-prints XML entirely in the browser — your data never leaves the page. Handles elements, attributes, CDATA sections, comments, and processing instructions. Shows element and attribute counts alongside character and line statistics. Minification removes all inter-element whitespace to reduce payload size.

• Validation uses the browser's native DOMParser, which reports parse errors with exact position data
• Formatter uses a token-based recursive serializer that preserves CDATA sections and XML comments verbatim
• Inline text optimization: elements with a single text child are kept on one line (<tag>value</tag>)
• Minifier strips whitespace-only text nodes between elements while preserving meaningful content
• Stats panel counts total elements, total attributes, and output line count for quick document profiling
• Indent size can be set to 2 or 4 spaces — the default (2) matches most .editorconfig and linter setups

Frequently Asked Questions

Does this support XML namespaces?

Yes. Namespace prefixes (xmlns:foo) are treated as regular attributes and preserved verbatim through format and minify operations.

What is the maximum XML size this handles?

Processing is limited by your browser's JavaScript heap. Typical documents up to a few megabytes work without issues.

Does it validate against an XSD schema?

No. It checks for well-formedness only — balanced tags, valid attribute syntax, and proper nesting. Schema validation against an XSD requires a server-side processor.

Are CDATA sections preserved?

Yes. CDATA sections are detected during tokenization and written back as <![CDATA[...]]> in both formatted and minified output.