Online XML Formatter

A fast XML formatter for developers and data engineers to tidy, validate, and export well-structured XML for data interchange and automation.

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2,708+

Total Calculations Run

< 15ms

Browser Execution Speed

100%

Client-Side Privacy

4.9 / 5.0

User Satisfaction

Worked Example & Common Values

Below is a sample worked calculation demonstrating how Online XML Formatter processes input data instantly inside your browser.

Sample Input Minified string: {"id":1,"status":"active","roles":["admin"]}

Computed Result

{
  "id": 1,
  "status": "active",
  "roles": [
    "admin"
  ]
}

Execution Mode Client-Side In-Browser JS

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About This Tool

The Online XML Formatter parses XML content to produce either a human-readable indentation or a compact minified version. It validates well-formedness and reports syntax errors with line and position hints. This enables developers, QA engineers, and data integrators to quickly verify XML structure before exchange.
Conceptually, it performs a streaming parse to detect mismatched tags, unescaped characters, or invalid entities, then applies a deterministic formatting pass that preserves CDATA, comments, and namespaces while adjusting whitespace and line breaks. It supports both pretty-printed and minified outputs.
Users leverage the tool during data pipelines, API testing, and configuration workflows where XML payloads are common. The formatter reduces diffs in version control, accelerates troubleshooting, and improves consistency across environments. It is designed for standard XML 1.0 and UTF-8 workflows.
Key features include configurable indentation, optional whitespace preservation, optional extra validation, and a clean text export. Typical use cases involve preparing XML for review, integration testing, or automated transformation tasks.

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How to Use

Provide inputs: paste or upload your XML payload.
Select mode: pretty for readability or minify for compact size.
Configure options: set indentation size and whitespace handling as needed.
Run: execute the formatter to obtain the output and any error details.
Review outputs: copy or export the formatted XML and review errors if present.

Frequently Asked Questions

Find Quick Answers

What formats are supported?

Only XML is processed. The tool formats and validates XML content, preserving namespaces and CDATA. Non-XML content is rejected with descriptive errors to guide correction.

Can it preserve comments and CDATA?

Yes. Comments and CDATA sections are preserved during formatting, ensuring that secondary information and literal data remain intact in the output.

Is the output always valid XML?

If input is well-formed and validation is enabled, the formatter reports errors and may omit formatting for invalid portions. If well-formed, the formatted result remains valid XML with the same content semantics.

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