SOAP envelopes, RSS feeds, and build configuration files frequently arrive as one continuous line, and the nesting that matters is invisible.
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XML Formatter
Xml
Free · API · MCPToolYour platform
Use XML Formatter three ways
The free XML Formatter on this page works in your browser. The same workflow is available via REST API for apps and via MCP for Cursor, Claude, and other agents — one API key, one plan, one quota. This tool is part of the developer-apis module under Developer Tools.
- Free in browserUse XML Formatter here — no account required.
- REST APICall from your server with
X-Api-Key. - MCP for agentsConnect Cursor or Claude to ToolYour MCP with the same key.
- 1. Get an API keySign in and open Dashboard → API Keys (works for REST and MCP).
- 2. Call or connectUse the REST API from your server, or paste the MCP URL into your agent config.
- 3. Same qualityOutput matches the free web tool across all three surfaces.
What is XML Formatter?
SOAP envelopes, RSS feeds, and build configuration files frequently arrive as one continuous line, and the nesting that matters is invisible. This XML formatter collapses the existing whitespace, then re-indents each element by depth so parents, children, and closing tags line up.
It is a formatter and nothing more, which is worth stating because XML tooling often bundles far more. There is no XSD or DTD validation, no namespace resolution, no XPath, and no canonicalisation for signature verification. Malformed markup with unclosed tags will still be formatted, just misleadingly, so use a real parser when correctness is the question. Processing instructions and comments are left in place. For the JSON equivalent of this job, JSON Formatter parses strictly before formatting.
Browser use is free and needs no signup. The same job runs over REST at POST https://api.toolyour.com/api/v1/developer-apis/xml-formatter and over MCP at https://api.toolyour.com/mcp — one API key, one shared monthly credit pool, 1 credit per successful call.
What are common questions about XML Formatter?
Does it validate against an XSD?
No. This indents markup for reading. Schema validation, namespace resolution, and canonicalisation need dedicated XML tooling.
What happens with malformed XML?
It still formats, because indentation is computed from tag depth rather than a parse tree. Unbalanced tags produce visibly odd indentation — treat that as a signal.
Are attributes reformatted?
No. Attributes stay on their element exactly as written; only whitespace between elements changes.
What are the key features of XML Formatter?
Depth-based indentation
Each nesting level is indented so structure is visible at a glance.
Handles single-line payloads
Collapsed SOAP and feed responses expand into a reviewable document.
Non-destructive to content
Element text and attributes are preserved; only inter-element whitespace changes.
How do you use XML Formatter?
Paste the XML
A SOAP envelope, an RSS item, or a build configuration fragment.
Read the structure
Check nesting depth and spot unclosed tags from odd indentation.
Copy for review
Use the formatted version in a ticket, a diff, or documentation.
Where XML still turns up
Plenty of production surfaces remain XML even in mostly-JSON systems. SOAP integrations with banking, logistics, and government services. Sitemaps and RSS feeds, where a malformed document quietly stops being consumed. Build and IDE configuration in the Java and .NET ecosystems. SVG assets, which are XML documents that happen to render.
In each case the debugging pattern is the same: make it readable first, then look at structure. A one-line response tells you nothing, while an indented one usually shows the misplaced element or the unexpected namespace prefix immediately.
Formatting across markup types
This category formats four markup and code languages with different engines and different guarantees. XML is indented heuristically here. HTML Formatter uses Prettier and understands HTML's void elements and inline semantics. CSS Formatter and JS Formatter also run Prettier, which parses before printing and therefore rejects syntax errors.
That difference matters when choosing a tool: if you need "did this parse", pick a Prettier-backed formatter or a validator. If you only need "let me read this", the XML formatter is the fastest path.
Which JSON / data codegen tools sit in this cluster?
Where do you browse more developer tools tools?
- Developer Tools tools
Browse the full Developer Tools category on ToolYour.
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Build UTM links, check ads copy limits, QA email subjects, and calculate ROAS/CPC/CTR — free in the browser; R
- Security Tools tools
Check HTTP security headers, TLS, cookies, JWTs, passwords, hashes, and SPF/DKIM/DMARC — free in the browser;
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