XML documentation author
Keep inline words, punctuation and CDATA unchanged.
Format mixed text and xml:space examples, compare both editors and copy the reviewed output.
Text and protected subtrees remain exact without partial output.
XML Formatter
Format XML with namespace-aware syntax checks, preserved mixed text and CDATA, explicit whitespace policies, local processing and clear error recovery.
Specialist tool for FormattingLive, copy-ready outputFocused single-task workflowPrivate in your browser
Use this result well
A quick decision brief for this specific tool
Inputs that matter
XML input
Output to expect
Formatted XML
How it works
A dedicated interactive panel for this data format or operation
- Start with the included valid sample, then replace it with your own input.
- Review errors and compare the output before replacing source data.
Choose your path
Built around the job you need to finish
Review XML 1.0 with namespace-aware errors and explicit whitespace policy while preserving original mixed content and protected lexical spans.
Configuration maintainer
Choose whether existing whitespace may be changed.
Compare preserve, structural reindent and compact modes with tabs/CRLF, then test an undeclared namespace.
Receives explicit layout boundaries and recoverable syntax errors.
Mobile reviewer
Inspect XML without hidden destructive transformations.
Use labeled narrow-screen settings, change source, rerun and download current output.
Editors stack, stale output disappears and local-only retention is clear.
Authoritative checks for this tool
Outputs and checklists are planning aids. Review the linked current authorities and the records, terms, instructions, and requirements that apply to your exact situation before a consequential decision.
- XML 1.0 Fifth EditionW3C · Well-formedness, text nodes, CDATA, entity references and xml:space; formatting is not canonicalization.
- Namespaces in XML 1.0W3C · Prefix binding and expanded attribute-name uniqueness.
- Saxes parser documentationSaxes maintainers · Strict evented XML parsing and namespace-aware checks used before source-span layout.
Was this tool helpful?
Related Tools
Tools you might need next
JSON to XML
Convert JSON using explicit typed-member or named-element mappings, escaped XML 1.0 text, root-name controls and data-loss refusal.
JSON
XML to JSON
Convert XML to JSON with ordered nodes or grouped objects. Preserve attributes, namespaces and mixed content; inspect errors and export locally.
Conversion
CSS Formatter
Format CSS with parser-aware strings, comments and nested rules while retaining declaration order, with local processing and clear error recovery.
Formatting
Reference & details
How it works
Updated August 2026
How it works
Updated August 2026Check well-formedness first
Saxes 6.0.0 checks XML 1.0 and namespaces before any output. DTDs, XML 1.1, malformed entities and duplicate attributes are refused; no external entity is fetched.
Retain original lexical spans
The formatter lays out original tag spans rather than serializing decoded values. Mixed content, CDATA and xml:space="preserve" subtrees remain exact. Existing text is preserved by default; structural reindent/compact modes require an explicit selection.
Review bytes and limits
Layout can add whitespace text nodes and changes bytes. This is not schema validation, canonicalization or signature preservation. Limits: 100,000 input characters, 500,000 output, 128 levels, 10,000 elements, 30,000 parts and 10 seconds.
Updated: August 2026
Example Scenarios
Keep punctuation and spacing around inline elements and CDATA while preparing an XML example.
Indent a text-free element tree or explicitly reindent known structural whitespace; compare attributes and namespaces.
Locate a mismatched tag or undeclared prefix, correct the source and rerun without copying partial output.
FAQ
Default mode preserves every existing text node, including whitespace-only text. Mixed-content and xml:space="preserve" subtrees are always retained. Select structural reindent only when the consumer permits whitespace changes.
No. It removes only whitespace in element-only layout candidates. It retains mixed text, CDATA and protected subtrees. Signed documents and whitespace-sensitive consumers need independent review.
No. They are explicitly refused. The workspace checks XML 1.0 well-formedness and namespaces but does not validate a DTD or schema.
Processing uses a local worker with no automatic history or Project save. Parser assets may require a connection on first use. Remove secrets before using a web utility.
Compare source and result, then copy or download XML text. If clipboard permission fails, select the result and use the system copy shortcut. Changing source or settings clears the old result.
About XML Formatter
Review XML 1.0 without treating angle brackets as a formatting shortcut. Compare original and formatted text, choose a whitespace policy and resolve explicit errors before copying.