XML Formatter — Free Browser-Based XML Beautifier & Minifier
Beautify or minify XML using your browser's native parser. No dependencies, fast and accurate.
How to use
- 1 Paste your XML.
- 2 Pick Beautify for readable indented output, or Minify to collapse whitespace.
- 3 Copy or download the result.
Why use this tool
- Uses your browser's native DOMParser — no external dependency.
- Catches malformed XML and surfaces the error.
- Pure client-side — your data stays private.
- Handles namespaces, CDATA, processing instructions.
Frequently asked questions
Does it validate against a DTD or XSD?
No — well-formedness only (matched tags, valid entities, single root element). For schema validation, use a dedicated XSD validator.
Will CDATA sections be preserved?
Yes — CDATA, comments, and processing instructions all round-trip correctly.
Why does my output show "parsererror"?
Your input is not well-formed XML. Check for missing closing tags, unescaped < or & in text content, or mismatched quotes in attributes.
What is XML Formatter?
An XML Formatter is a tool that beautifies or minifies XML documents using the browser's native parser. The beautify mode re-indents elements and attributes into a readable hierarchy, while the minify mode strips whitespace to reduce size. Because it relies on the built-in parser with no external dependencies, it processes XML quickly and accurately, entirely client-side on the device.
How XML Formatter compares to alternatives
| Feature | Zerethon Tools | Typical online tools | Desktop apps |
|---|---|---|---|
| Signup required | No | Sometimes | No (IDEs) |
| Data leaves device | No | Yes | No |
| Beautify + minify | Both | Sometimes | Both |
| Native-parser validation | Yes | Sometimes | Yes |
| Free | Yes | Yes (with ads) | Often paid |
| Works offline | Yes (after load) | No | Yes |
XML Formatter is a free developer utility by Zerethon Tools. Beautify or minify XML using your browser's native parser. No dependencies, fast and accurate. Runs entirely in the browser — no signup, no upload.
- Category
- Developer
- Pricing
- Free
- Privacy
- Browser-based
- Signup
- Not required
Privacy
Your data never leaves your browser unless explicitly stated. XML Formatter runs entirely client-side — no server upload, no logging, no tracking of your input.
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Learn the basics
How-to guides
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