XML Formatter & Validator Online — Free, Private
Output
Paste any XML into the input box, then click Format to indent and pretty-print it or Minify to strip whitespace. The tool checks that every tag is closed and nested correctly as you type, and points to the first tag that breaks — all without sending your document anywhere.
How it works
- 1 Paste your XML into the input Click the input pane and paste raw XML — an RSS feed, a config file, a SOAP response, whatever you have. Validation runs in real time and flags the first mismatched or unclosed tag.
- 2 Click Format or Minify Hit Format to get indented XML with each element on its own line, or Minify to collapse it into a single compact line with the whitespace between tags removed.
- 3 Copy the result Click Copy output to copy the formatted or minified XML to your clipboard in one click.
Your data stays private
All processing happens entirely in your browser. No files, text, or data are ever sent to our servers. You can disconnect from the internet and this tool will still work.
Frequently asked questions
- How does the XML formatter work?
- It parses your XML tag by tag in JavaScript, tracks nesting depth on a stack, and re-indents each element on its own line. Attribute values inside quotes are left untouched, and comments and CDATA sections are preserved exactly.
- Does it validate XML?
- It checks well-formedness: every opening tag must have a matching closing tag in the right order, and stray or unclosed tags are reported with the tag name. It does not validate against a DTD or XSD schema.
- Can I minify XML?
- Yes. Click Minify to remove the whitespace and line breaks between tags and produce the smallest single-line version. Text content, comments, and CDATA are kept intact.
- Are comments and CDATA kept?
- Yes. Comments (<!-- ... -->) and CDATA blocks (<![CDATA[ ... ]]>) are treated as opaque and copied through unchanged, so nothing inside them is reformatted or escaped.
- Is my data private?
- Your XML never leaves your device. All parsing, formatting, and validation run in JavaScript inside your browser tab. No network requests are made, so it works offline once the page has loaded.
- What is the maximum file size?
- There is no hard limit, but very large documents (over about 10 MB) may format slowly because everything runs in the browser's memory.