XML Formatter

No formatter can infer whether whitespace is significant without application context. This tool adds indentation between markup children, and its checked reindent option replaces existing whitespace-only text there. Mixed text and CDATA protect their entire containing subtree; xml:space="preserve" also protects the entire subtree, including nested overrides. Leaf text remains unchanged. Use Validate only for whitespace-sensitive, signed or canonicalized XML.

After textarea-style CRLF/CR-to-LF normalization, original tag spelling, attribute order and quotes, entity-reference spelling, comments, processing instructions, CDATA and empty-element notation are retained. Protected subtrees are copied verbatim. Formatting only changes whitespace between markup nodes in eligible elements. Uncheck reindent to preserve subtrees that already contain whitespace text; eligible elements with no text can still receive new indentation.

It uses your browser’s XML parser to check well-formedness within the tool’s supported subset and limits. It does not check an XSD, a DTD, application semantics or digital signatures. Error wording depends on the browser; scanner errors include line and UTF-16 column. The browser’s reserved parser-error namespace is treated as an error. Validate only produces no output or download.

DTDs, entity declarations and other unsupported declarations are rejected by the scanner before parsing. Standard predefined entities and numeric character references are allowed. XML is parsed into a detached document for syntax checking and never rendered or inserted into the page. Processing instructions are retained as text, not followed. This tool does not resolve schemas, stylesheets, XInclude or external resources.

Paste text already decoded by your browser. Downloads use UTF-8. An encoding declaration must be UTF-8/UTF8 or omitted; other declared encodings are rejected rather than exported under a misleading label. Input is limited to 100,000 UTF-16 units, 20,000 lexical tokens and 100 nested elements; formatted output is limited to 1,000,000 units. Unpaired UTF-16 surrogates are rejected. Input is never truncated.

Text-sensitive subtrees are retained without internal formatting. For example, <p>Hello <em>world</em>!</p> must keep its text spacing. A CDATA section or xml:space="preserve" also protects its containing subtree. With reindent unchecked, even whitespace-only text protects its containing subtree. Output may therefore intentionally mix indented blocks with unchanged inline content.