XML Formatter

Input

Output

Why use a private XML formatter?

XML is still the wire format for a huge amount of enterprise software — SOAP APIs, Maven POM files, Android manifests, SVG, Office Open XML, and countless config systems. Pasting these into an online formatter means sending potentially sensitive payloads — API responses, credentials in config attributes, internal service addresses — to a third-party server.

formatvault formats and validates XML entirely inside your browser using fast-xml-parser. Nothing is transmitted. The network tab will show zero outbound requests while you work.

How it works

Your XML is parsed into an in-memory tree using fast-xml-parser, then re-serialized with consistent indentation. Attributes, CDATA sections, and comments are preserved through the round-trip. The XMLValidator checks well-formedness before formatting so you get a precise error with line and column numbers before any output is produced.

Minify mode strips all non-significant whitespace for smaller payloads. Validate mode checks only well-formedness without modifying the input — useful as a quick sanity check before committing a config file.

Common use cases

Formatting SOAP request/response bodies from API testing tools
Validating Android AndroidManifest.xml and layout files before building
Pretty-printing Maven pom.xml files with deeply nested dependency trees
Debugging minified XML payloads from enterprise integrations (SAP, Salesforce)
Formatting SVG files exported from Figma or Illustrator for readability
Normalising Office Open XML (.docx/.xlsx internals) for inspection
Minifying XML config files before bundling into a deployment artifact
Checking well-formedness of RSS or Atom feed XML

Frequently asked questions

Is it safe to format XML that contains sensitive data?: Yes. All processing happens in your browser using fast-xml-parser — your XML is never sent to any server. You can verify this by opening DevTools → Network and observing zero outbound requests when you format.
What does "validate" check?: The validator checks that your XML is well-formed: proper tag nesting, closed tags, valid attribute syntax, and legal character encoding. It does not validate against an XSD or DTD schema — that would require a schema file.
Does the formatter preserve comments and CDATA sections?: Yes. Comments and CDATA sections are preserved through the parse-and-rebuild cycle. Attributes are also preserved with their original values.
What is the difference between formatting and minifying?: Formatting adds consistent indentation and newlines to make the XML human-readable. Minifying removes all non-significant whitespace to produce the smallest possible output, useful for reducing payload sizes.
Does it work offline?: Yes, once the page has loaded. The fast-xml-parser library is bundled with the app and requires no network access to format or validate XML.

Why use a private XML formatter?

formatvault formats and validates XML entirely inside your browser using fast-xml-parser. Nothing is transmitted. The network tab will show zero outbound requests while you work.

How it works

Common use cases

Formatting SOAP request/response bodies from API testing tools

Validating Android AndroidManifest.xml and layout files before building

Pretty-printing Maven pom.xml files with deeply nested dependency trees

Debugging minified XML payloads from enterprise integrations (SAP, Salesforce)

Formatting SVG files exported from Figma or Illustrator for readability

Normalising Office Open XML (.docx/.xlsx internals) for inspection

Minifying XML config files before bundling into a deployment artifact

Checking well-formedness of RSS or Atom feed XML

Frequently asked questions

Is it safe to format XML that contains sensitive data?

Yes. All processing happens in your browser using fast-xml-parser — your XML is never sent to any server. You can verify this by opening DevTools → Network and observing zero outbound requests when you format.

What does "validate" check?

The validator checks that your XML is well-formed: proper tag nesting, closed tags, valid attribute syntax, and legal character encoding. It does not validate against an XSD or DTD schema — that would require a schema file.

Does the formatter preserve comments and CDATA sections?

Yes. Comments and CDATA sections are preserved through the parse-and-rebuild cycle. Attributes are also preserved with their original values.

What is the difference between formatting and minifying?

Formatting adds consistent indentation and newlines to make the XML human-readable. Minifying removes all non-significant whitespace to produce the smallest possible output, useful for reducing payload sizes.

Does it work offline?

Yes, once the page has loaded. The fast-xml-parser library is bundled with the app and requires no network access to format or validate XML.