XML Formatter Online
Paste XML to validate the structure, format nested tags with readable indentation, or minify the same XML for compact transfer. The tool runs locally in your browser and reports parser errors before producing output.
XML Input
Formatted Output
Why Use an XML Formatter
XML remains common in feeds, legacy APIs, financial integrations, and infrastructure metadata. This formatter helps you make nested structures readable, catch parser errors early, and normalize spacing before copy-pasting into repositories or support tickets.
Consistent XML formatting also improves team collaboration. Diff reviews become cleaner, syntax mistakes are easier to spot, and shared examples are less ambiguous. For operations teams, this reduces avoidable deployment rollbacks caused by malformed tags or broken nesting.
XML Formatting Decision Guide
| Task | Input | Output | Best use case |
|---|---|---|---|
| Beautify XML | Valid XML with compact or inconsistent whitespace | Indented XML with readable nesting | Review API payloads, config files, RSS feeds, and sitemap fragments |
| Minify XML | Valid formatted XML | Whitespace-trimmed XML with the same structure | Prepare payloads for storage, transfer, or pasted configuration fields |
| Validate XML | Any XML snippet | Parser result with an error message when structure is invalid | Catch unclosed tags, bad nesting, and malformed attributes before deployment |
Calculation Method and References
Calculation method: this tool parses XML with the browser DOMParser API, checks for parser errors, serializes the document, and then applies whitespace formatting or minification. It does not upload the XML text to SuperCalc.
The formatter uses a structure-first workflow. First, it confirms that the XML has one valid document tree. Second, it serializes that tree so tags and attributes are normalized. Third, it either inserts line breaks and indentation for review or removes whitespace between tags for compact output. Because XML can be used in deployments, feeds, and integration payloads, syntax validation comes before beautification.
Worked example: if you paste a compact sitemap fragment such as <urlset><url><loc>https://example.com/</loc></url></urlset>, the format action separates each nested element onto its own line. If the closing tag is misspelled, the parser error appears instead of a misleading formatted result.
FAQ
Does this XML formatter validate syntax?
Yes. The formatter parses XML first and reports invalid tags, malformed structure, or parser errors before generating output.
Can I minify XML as well?
Yes. Use the minify action to remove unnecessary whitespace while preserving XML structure.
Is my XML uploaded to any server?
No. XML parsing, formatting, and minification run locally in your browser.
Does this support RSS and sitemap XML?
Yes. RSS feeds, sitemap fragments, and API XML payloads can be validated and reformatted as plain XML text.
What is the fastest way to fix XML parser errors?
Look for unclosed tags, incorrect nesting, and unescaped symbols like & in text nodes. Fix those first, then format again.
Related Tools
About This Calculator
Format, validate, and beautify XML online with auto-indentation, syntax highlighting, and minification. Supports RSS feeds, SOAP payloads, Maven POM files, and API config XML.
Frequently Asked Questions
Can this tool detect malformed XML?
Yes. It parses XML using a standards-compliant DOM parser and reports detailed parser errors including line numbers and error descriptions before creating formatted output. Common issues detected include unclosed tags, mismatched element names, invalid attribute syntax, and missing root elements.
Does it support minified XML output?
Yes. Use the minify mode to remove whitespace between tags.
Is XML processing local?
Yes. Input stays local because processing runs in your browser.
What XML problems should I fix first?
Start with parser failures: unclosed tags, mismatched element names, invalid attribute quotes, multiple root elements, and unescaped ampersands in text nodes. Once the XML parses successfully, formatting becomes a readability step rather than a repair step.
Can I use this for RSS feeds, sitemaps, and API payloads?
Yes. RSS feeds, XML sitemap snippets, SOAP payloads, Maven POM fragments, and configuration XML can be pasted into the formatter as plain text. For very large production files, validate the final file in your deployment or feed pipeline as well.
The SuperCalc Editorial Team maintains calculator interfaces, formula notes, examples, and supporting explanations. Methods, assumptions, source links, and review depth vary by calculator and are documented on the relevant page where available.