SEO Report Tools

Webmaster Utilities · Runs in your browser · Free

XML Formatter & Validator

Check XML is well-formed and pretty-print or minify it.

What this tool does

Verifies matching tags, quoted attributes and escaped ampersands, then outputs indented or compact XML.

Who should use it

Anyone editing sitemaps, feeds or configuration files.

How it works

A tokenizer walks the document: comments, CDATA, processing instructions and tags are recognised, open elements are tracked on a stack, and errors report the approximate line.

How to use it

  1. Enter or paste xml in the form.
  2. Adjust the options below the main box if you need to; the defaults suit most cases. Use "Load example" to see how input should look.
  3. Press the run button. Processing happens instantly in your browser.
  4. Review the result panel, then copy or download the output if the tool offers it. Use Reset to start over.

Practical example

<a><b></a> is reported as a closing tag mismatch.

Understanding the results

Only well-formedness is checked, not conformance to a schema.

Limitations

DTD and XSD validation are not performed. Entities beyond the five predefined and numeric references are not resolved.

Accuracy and report transparency

Results are computed in your browser from exactly what you enter. Deterministic steps (counting, parsing, encoding, validation) are verified by an automated test-suite with known answers. Where a method is a heuristic, the result panel says "estimated". No external data is used and nothing is invented.

Privacy

Your input never leaves your device for this tool. We count anonymous events (tool opened, run, copied) without storing what you typed. See the Privacy Policy.

Try these next

Sitemap XML ValidatorValidate pasted sitemap XML: well-formedness, namespace, URL format, dates and limits.Sitemap URL ExtractorExtract the list of URLs from a sitemap, with a host breakdown.JSON Formatter & ValidatorValidate JSON, locate syntax errors, and pretty-print or minify it.

Frequently asked questions

What does well-formed mean?

One root element, properly nested and closed tags, quoted attribute values and escaped special characters.

Is my data sent to your server?

No. This tool runs entirely in your browser, so the text or files you enter stay on your device. We do record anonymous counts of how often each tool is opened or run (no input data) to see which tools are useful.

How accurate are the results?

Counting, parsing, encoding and validation steps are deterministic and covered by automated tests with known answers. Anything based on a heuristic is labelled "estimated" in the result panel.

Is this tool really free?

Yes. There is no account, limit or paid plan. The site is supported by advertising, which is disclosed on our Advertising Disclosure page.

References