XML Formatter
Format and validate XML documents
Syntax validation
Format and minify
Error highlighting
Copy formatted XML
The SOAP response arrives as a single line of XML. 47,000 characters without a single line break. Somewhere in there is the error message explaining why the payment failed. Good luck finding it.
XML may be machine-readable, but humans need to debug it too. This formatter transforms any XML—no matter how compressed or malformed—into properly indented, readable documents with syntax validation.
What is XML Formatting?
XML formatting adds proper indentation and line breaks to XML documents, making nested structures visible and readable. A good formatter also validates syntax, catching issues like mismatched tags or invalid characters before they cause problems.
Before and after:
<!-- Before -->
<order><customer><name>John</name><email>john@example.com</email></customer><items><item><sku>ABC123</sku><qty>2</qty></item></items></order>
<!-- After -->
<order>
<customer>
<name>John</name>
<email>john@example.com</email>
</customer>
<items>
<item>
<sku>ABC123</sku>
<qty>2</qty>
</item>
</items>
</order>
XML's power is in its hierarchy. Proper formatting makes parent-child relationships visible at a glance, something impossible in compressed single-line format.
Why People Actually Need This Tool
Despite JSON's rise, XML powers SOAP APIs, RSS feeds, SVG graphics, Office documents, Android manifests, and countless enterprise systems. You'll encounter it.
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API debugging — Read SOAP responses and XML payloads clearly.
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Configuration editing — Format web.config, pom.xml, and other config files.
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Data inspection — Examine XML exports from databases and applications.
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SVG editing — Make SVG graphics readable for manual editing.
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Feed debugging — Troubleshoot RSS and Atom feeds.
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Documentation — Format XML examples for technical docs.
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Validation — Catch syntax errors before they break systems.
How to Use the XML Formatter
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Paste your XML — Any XML document, regardless of current formatting.
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Format instantly — Get properly indented output with syntax validation.
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Review any errors — See validation messages for malformed XML.
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Copy formatted XML — Use in your editor or documentation.
| XML Feature | Formatting Behavior | Purpose |
|---|---|---|
| Nested elements | Each on new line, indented | Show hierarchy |
| Attributes | Kept on same line as opening tag | Keep tags compact |
| Text content | Inline with containing element | Preserve text nodes |
| Empty elements | Self-closing <tag /> | Reduce verbosity |
| Comments | Preserved, properly indented | Maintain documentation |
In some XML contexts (like mixed content), whitespace matters. Formatting adds whitespace that might affect certain parsers. Test formatted output with your actual system.
Real-World Use Cases
1. The SOAP API Debug
Context: Enterprise integration with SOAP web service failing intermittently.
Problem: Error responses are single-line XML impossible to read in logs.
Solution: Format the XML to see error code nested 5 levels deep in the fault structure.
Outcome: Actual error identified: authentication token expired. Would have taken hours to find unformatted.
2. The Maven Configuration
Context: Java project with complex pom.xml causing build failures.
Problem: Pom file is 800 lines, previously formatted inconsistently by different IDEs.
Solution: Reformat entire file with consistent indentation.
Outcome: Duplicate dependency discovered that was hidden by bad formatting.
3. The SVG Optimization
Context: Designer exported SVG has unnecessary groups and transforms.
Problem: SVG exported as single line, impossible to identify what to remove.
Solution: Format SVG to see structure. Manually remove unnecessary wrapper groups.
Outcome: SVG file size reduced 40%, loads faster, easier to animate.
4. The RSS Feed Troubleshooting
Context: Podcast RSS feed rejected by Apple Podcasts.
Problem: Error says "invalid XML" but feed looks correct.
Solution: Format reveals unclosed tag buried in episode description.
Outcome: Fix the tag, feed validates, podcast published.
5. The Android Manifest Review
Context: Android app requesting too many permissions.
Problem: AndroidManifest.xml permissions scattered, hard to audit.
Solution: Format manifest, group and comment permission sections.
Outcome: Three unnecessary permissions identified and removed.
6. The Office Document Extraction
Context: Need to extract data from Excel files programmatically.
Problem: XLSX internals are compressed XML, exported as single line.
Solution: Format the extracted XML to understand structure.
Outcome: Build parser targeting correct paths for required data.
7. The Config Migration
Context: Migrating from XML config to YAML, need to understand current structure.
Problem: Legacy XML config is poorly formatted, hard to understand hierarchy.
Solution: Format XML to clearly see all settings and their nesting.
Outcome: Accurate migration with no missed settings.
Common Mistakes and How to Avoid Them
Unlike HTML, XML requires properly closed tags, case-sensitive names, and quoted attributes. Formatters help catch these issues.
Privacy and Data Handling
This XML Formatter operates entirely in your browser.
- No XML is sent to any server.
- No documents are logged or stored.
- No account required.
- Works completely offline.
Format sensitive SOAP responses and configuration files safely—nothing leaves your device.
Conclusion
XML's verbosity is a feature—it's self-documenting and unambiguous. But that verbosity becomes a bug when you're staring at a 50KB single-line response trying to find an error.
This formatter makes XML readable again. Paste any XML—compressed API responses, tangled config files, minified SVGs—and get properly structured output you can actually work with.
Machines can read anything. Sometimes humans need a little help.