Format, Validate & Minify XML in your browser.
Clean, client-side XML prettifier, strict schema validator, syntax error fixer, and bi-directional XML to JSON converter. Zero tracking, zero server uploads.
Your data stays on your device.
Processing happens strictly on your local machine using client-side primitives. Your data is never transmitted, tracked, or stored by Redsite.
Designed for precision. Engineered for speed.
Everything you need to inspect, repair, format, and convert complex enterprise XML documents without privacy compromises.
100% Client-Side Privacy
Your XML payloads never touch a remote server. All validation, indentation, and conversion logic execute directly in your browser's V8 or JavaScriptCore runtime.
Precise Error Diagnostics
Pinpoint syntax errors with exact line and column coordinates. The diagnostic engine flags mismatched tags, unquoted attributes, unclosed brackets, and illegal entities with an instant jump button.
Intelligent Indentation
Format with 2 spaces, 4 spaces, or tabs. Preserves CDATA sections, processing instructions, XML declarations, namespaces, and comments byte-for-byte without unwanted reordering.
XML ↔ JSON Conversion
Transform XML structures into modern JSON and vice versa. Intelligently converts repeated child nodes into arrays and extracts element attributes into readable @key properties.
Live XPath 1.0 Tester
Extract elements, test queries, and inspect nodes directly inside the tool. Built-in namespace resolution supports SOAP envelopes, SVG paths, RSS channels, and complex schemas.
One-Click Auto-Fixer
Quickly repair common syntax slips: escape bare ampersands (& → &), quote unquoted attributes (id=1 → id="1"), and resolve mismatched tags.
How to Format & Validate XML. Step by step.
Master well-formed XML principles, troubleshooting syntax traps, and best practices.
Paste or Upload XML
Copy raw XML from your API response, SOAP client, RSS feed, or IDE and paste it into the editor. You can also drag and drop any .xml file directly into the workbench.
Inspect & Resolve Diagnostics
The real-time validator instantly identifies syntax errors. Click the line number or use the ⚡ Quick Fix button to resolve unescaped entities or unquoted attributes on the spot.
Format, Minify, or Convert
Select your desired indentation (2 spaces, 4 spaces, or tab) and click Format XML. Download the cleaned document or copy it to your clipboard with a single click.
Well-Formed XML vs. Valid XML: What’s the Difference?
Understanding the distinction between well-formed XML and valid XML is fundamental for every developer working with enterprise integrations, SOAP web services, Maven POM files, or XML sitemaps:
- Well-Formed XML: Complies strictly with the universal syntax rules defined in the W3C XML 1.0 Specification. It requires a single root element, properly paired and closed tags, quoted attribute values, and properly escaped entity characters (such as
&and<). If an XML document is not well-formed, an XML parser cannot construct the DOM tree. - Valid XML: Goes a step further than well-formedness by conforming to a specific formal schema definition, such as an XSD (XML Schema Definition) or DTD (Document Type Definition). A valid document strictly adheres to predefined element sequences, permitted data types, and attribute constraints.
Common XML Syntax Pitfalls and Resolutions
| Syntax Issue | Broken XML Example | Correct / Repaired XML | Why It Matters |
|---|---|---|---|
| Unescaped Ampersand | <title>Tom & Jerry</title> |
<title>Tom & Jerry</title> |
The character & begins an entity reference. Bare ampersands cause instant parser failure. |
| Unquoted Attribute | <order id=9821> |
<order id="9821"> |
All XML attribute values must be enclosed in single or double quotes without exception. |
| Mismatched Closing Tag | <item>...</product> |
<item>...</item> |
XML is case-sensitive and enforces strict hierarchical nesting of opening and closing tags. |
| Multiple Root Elements | <a/><b/> |
<root><a/><b/></root> |
Every XML document must have exactly one root element that encloses all other child elements. |
| Unclosed CDATA Block | <![CDATA[raw code> |
<![CDATA[raw code]]> |
CDATA blocks must be cleanly terminated with the ]]> sequence. |
Frequently asked questions.
Everything you need to know about XML formatting, client-side security, and data handling on Redsite.
Back to Formatter ↑Does Redsite store, upload, or transmit my XML data?
Absolutely not. Redsite operates strictly on the philosophy of "Simple by Design. Private by Default."
All XML parsing, formatting, validation, and minification occur locally within your browser using native JavaScript primitives (such as the W3C DOMParser). Your data never leaves your computer, and we maintain zero server-side telemetry or logs.
How does the XML validator pinpoint syntax errors?
The validator employs a dual-pass diagnostic engine:
First, a custom client-side lexical tokenizer scans for structural flaws, tracking open/close tag stacks to detect mismatched tag names, unclosed brackets, unquoted attributes, and unescaped ampersands. Second, it invokes the browser's native XML DOM parser to confirm strict W3C compliance. This produces exact line and column coordinates alongside an interactive Jump to Line button.
Can I convert XML to JSON or JSON to XML?
Yes. Simply click the XML → JSON button in the toolbar. The engine recursively converts the XML DOM into standard JSON, grouping duplicate child elements into arrays and mapping element attributes to @attribute properties. You can also paste JSON into the input editor and click JSON → XML to generate clean, indented XML.
Does the formatter preserve CDATA blocks and XML comments?
Yes. The prettifier uses protected tokenization to ensure all <![CDATA[ ... ]]> blocks, XML declaration headers (<?xml ...?>), DOCTYPE definitions, and comment blocks (<!-- ... -->) remain byte-for-byte intact.
What is the maximum XML file size supported?
Because the tool runs entirely in your local browser environment, it comfortably processes XML payloads up to 20MB without lag. For larger files, browser memory limits may apply, in which case native CLI streaming parsers are recommended.
Is this tool completely free to use?
Yes, 100% free with no registration, no API keys, and no rate limits. It is an open developer utility provided as part of the Redsite product suite.