XML Formatter
Beautify or minify XML with configurable indentation and real-time validation.
What is XML Formatter?
An XML formatter is a developer utility that takes raw or poorly structured XML and outputs a clean, human-readable version — or compresses it into a compact minified form. XML (eXtensible Markup Language) is widely used for configuration files, data interchange, APIs, RSS feeds, and countless enterprise systems. When XML arrives as a single unbroken line or with inconsistent indentation, reading and debugging it becomes genuinely painful.
This tool parses your XML input, validates it for well-formedness, and re-serialises it with consistent indentation. You can choose your indentation size — typically 2 or 4 spaces, or a tab character — so the output matches your team's coding standards. Minification does the opposite: it strips all unnecessary whitespace to produce the smallest possible file, which reduces bandwidth and parsing overhead in production systems.
Beyond formatting, the tool highlights syntax errors in real time. If your XML has an unclosed tag, a missing attribute quote, or an invalid character, you'll see a clear error message pointing to the problem rather than a confusing blank output. This makes it a quick sanity-check tool before you drop XML into a config file, commit it to a repository, or send it to a third-party API.
Whether you are working with SOAP web services, Android resource files, Maven build configs, or any XML-based data format, having a reliable formatter in your browser saves time and reduces mistakes.
How to Use XML Formatter
- Paste your XML
Copy your raw, minified, or messy XML and paste it into the input area. You can also type directly.
- Choose indent size
Select 2 spaces, 4 spaces, or tabs for beautification — or choose Minify to compact the output.
- Validate and format
The tool checks your XML for well-formedness errors and displays a formatted result or a clear error message.
- Copy the result
Click Copy to grab the formatted XML to your clipboard, ready to paste into your editor or project.
Key Benefits
Consistent indentation turns a wall of angle brackets into a clean, scannable tree structure.
Catch malformed XML — unclosed tags, bad attributes, invalid characters — before it causes runtime errors.
Strip all whitespace to reduce XML file size and speed up parsing in bandwidth-sensitive environments.
Your XML is processed entirely in the browser and never uploaded to any server, keeping sensitive configs private.
Frequently Asked Questions
Well-formed XML follows basic syntax rules: every tag is closed, attributes are quoted, and there is exactly one root element. Valid XML additionally conforms to a specific schema (DTD or XSD). This tool checks well-formedness.
Minified XML removes all unnecessary whitespace, reducing file size. This lowers bandwidth usage and can speed up parsing, which matters in high-volume APIs or embedded systems with limited resources.
Yes. Namespace declarations (xmlns attributes) are preserved exactly as written. The formatter only adjusts whitespace and indentation, leaving all element names, attributes, and namespace prefixes untouched.
The tool handles XML in the browser, so performance depends on your device. Files up to a few megabytes format quickly. For very large files (tens of MB), a dedicated desktop editor may be faster.