Free XML Formatter & Validator that works offline
Validate and beautify compact XML from APIs, feeds and configuration files. Parsing occurs before formatting, so the tool does not create a polished result from structurally invalid markup.
What this xml formatter & validator does
XML is stricter than HTML: tags must close correctly, attribute values need quotes and reserved characters require escaping. Browser-native XML parsing provides a standards-based syntax check, while serialization and indentation improve readability.
How to use the XML Formatter & Validator
- Enter or paste a complete XML document or element into the tool.
- Adjust the available options so they match the format and result you need.
- Choose Format & validate XML and review serialized and indented valid XML before using it.
- Copy or download the result, then clear the page if the input was sensitive.
Common uses
- Reading compact SOAP and API payloads
- Checking XML configuration before deployment
- Formatting RSS or Atom feed samples
- Finding malformed nesting in generated markup
Private processing and offline access
This tool does not submit your input to a conversion server. Processing takes place inside the browser using local JavaScript and standard Web APIs. After the PWA has been installed or cached, the page and its core features remain available without an internet connection. Closing or clearing the page removes unsaved input; the tool does not create an account or cloud history.
Tips for accurate results
- A valid document normally has one root element.
- External schemas and DTD validation are outside this formatter’s scope.
- Preserve significant mixed-content whitespace when editing prose-heavy XML.
Frequently asked questions
Does this tool upload my data?
No. XML Formatter & Validator processes its input in the current browser and does not submit it to a conversion API.
What input does the XML Formatter & Validator accept?
Standard well-formed XML accepted by the browser DOMParser is supported. Malformed tags, unescaped entities and invalid nesting are reported.
Can I use this tool offline?
Yes. Once the Offline Tools PWA has cached the page, the core feature works without an internet connection.