Free XML Formatter & Validator — Online, No Sign-Up
Format, validate, minify, and explore XML in a visual tree — instantly in your browser.
About this tool
Paste raw XML to instantly format it with proper indentation, validate its syntax with precise error messages, or minify it for production. Switch to Tree View to explore nested nodes interactively. All processing is 100% client-side — your data never leaves your browser.
Why Format XML?
XML from APIs, configuration files, and data exports is often dense and hard to read at a glance. The formatter adds consistent indentation to reveal the nested structure, making it easy to inspect attributes, spot missing nodes, and verify the document before use.
Validate Before You Ship
Malformed XML fails silently in many systems — a mismatched tag or missing quote can break parsers, APIs, and configuration loaders. The validator pinpoints exactly where the error is so you can fix it before it reaches production.
codeFormat + Tree + Validate in One Tool
Paste any XML and choose your view: formatted with indentation, minified for production, or explored as an interactive tree. Errors are caught instantly with precise line numbers.
Spot a missing closing tag or mismatched attribute instantly — before it breaks your API integration or config loader.
Quick Usage Guide
- 1Instant XML formatting with 2 or 4 space indentation
- 2Real-time validation with line and column error positions
- 3Minify mode to strip whitespace for compact output
- 4Interactive Tree View — expand and collapse XML nodes visually
- 5Copy formatted output to clipboard with one click
- 6100% browser-based — no data sent to any server
Frequently Asked Questions
help_outlineDoes this XML formatter send my data to a server?
No. All XML parsing, formatting, and validation happens entirely in your browser using the native DOMParser API. Your data is never sent anywhere.
verifiedWhat does the Tree View do?
Tree View parses your XML and displays the element hierarchy as an interactive tree where you can expand and collapse nodes to explore nested structures without reading raw text.
quizWhat errors does the validator detect?
The validator uses the browser's native XML parser and reports syntax errors including unclosed tags, missing quotes on attributes, mismatched tags, and invalid character sequences — along with the line and column where the error occurred.
account_balance_walletCan I minify XML with this tool?
Yes. Minify mode removes all whitespace between tags, producing compact XML suitable for embedding in payloads or configuration files.