Completely. The XML Formatter runs entirely inside your web browser — no content is ever transmitted to a server. You can use it safely with sensitive configuration files, internal API payloads, or proprietary data structures.

📋 Data

XML Formatter & Validator

Paste XML into the left panel to instantly format, beautify and validate it. Configurable indentation, minify mode, namespace and CDATA support — all client-side.

📖 How to Use This Tool

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Paste or type XML into the left panel — output appears instantly on the right

Choose your indent size (2 spaces, 4 spaces, or Tab) from the toolbar

Use Minify to strip whitespace for production, or Format to re-expand

Copy the result to clipboard or Download it as a .xml file

📝 Examples

Compact → Pretty

Formatted with nested indentation

Validation error

Stats bar shows red parse error message

📝 Input XML

✅ Formatted Output

— Paste XML to begin

What is an XML Formatter?

An XML formatter (also called an XML pretty-printer or beautifier) takes minified, collapsed, or poorly indented XML and outputs a cleanly structured version with consistent indentation, making the document hierarchy immediately readable. XML is the foundation of countless enterprise and DevOps technologies — Maven POM files, Jenkins pipeline configurations, SOAP API responses, Android manifests, Spring Boot application contexts, and Kubernetes custom resource definitions all use XML. When working with these formats, a formatter is an essential daily tool.

Beyond formatting, a well-built XML tool also validates well-formedness — verifying that tags are properly nested, all opened tags are closed, attribute values are quoted, and the document has a single root element. Malformed XML causes cryptic parse errors that can be difficult to locate by eye in a large minified payload. Instant validation feedback saves engineers significant debugging time when working with SOAP APIs, CI/CD config files, and XML-based data exchange formats.

When to Use This Tool

Debugging SOAP API responses: When a SOAP web service returns a minified XML envelope, paste it here to format it and quickly locate the fault element, status code, or data payload buried in the response body.
Reading Maven POM files: Large Maven POM files with many dependencies, plugins, and profiles can be dense and hard to navigate — formatting and inspecting them makes it easy to identify dependency version conflicts and plugin configurations.
Inspecting CI/CD pipeline XML configs: Jenkins pipeline XML, TeamCity build configurations, and MSBuild project files benefit from clean indentation when auditing or reviewing changes to build logic.
Validating Kubernetes and Helm XML resources: While Kubernetes primarily uses YAML, some operators and custom resources use XML for configuration — validating well-formedness before applying resources to a cluster prevents deployment failures.

How It Works

The formatter uses the browser's native DOMParser API with the text/xml MIME type to parse the input XML document into a DOM tree. If the parser encounters any well-formedness violations — unclosed tags, illegal characters, or structural errors — it returns a <parsererror> element in the DOM, which the tool detects and displays as a validation error with the relevant error message. For valid documents, the formatter recursively traverses the DOM tree and serialises it back to a string, inserting indentation based on node depth. CDATA sections, XML comments, processing instructions, and namespace declarations are all preserved exactly as parsed. The entire process runs in-browser with no server involvement.

Frequently Asked Questions

How does the XML Formatter work?

Paste or type XML into the input panel and the formatter immediately processes it using the browser's built-in DOMParser API, which parses the XML into a structured DOM tree using the same engine that renders HTML in your browser. If the XML is well-formed, the tool recursively walks the DOM tree and serialises it back with clean, configurable indentation applied at each level of nesting — making the document hierarchy immediately visible. If the XML contains errors, the parser returns a <parsererror> element identifying the problem, which the tool displays in the status bar so you can quickly locate and fix the issue. All processing happens locally in your browser — no data is sent to any server.

Does it support namespaces and CDATA?

Yes. The formatter fully supports XML namespaces, preserving namespace prefixes and namespace declarations (xmlns:prefix="uri") exactly as written in the source document. This is important when working with SOAP envelopes, which use multiple namespaces like xmlns:soap and xmlns:xsd, or with Spring XML application contexts that use Spring's xmlns:beans namespace. CDATA sections (<![CDATA[...]]>) are also preserved intact — their content is not escaped or modified. Processing instructions (<?xml version="1.0"?>) and XML comments () are retained in their original positions in the document tree.

Is my data private?

Completely. The XML Formatter runs entirely within your web browser using client-side JavaScript — no XML content is ever transmitted to a remote server, logged, or stored. This makes it safe to use with sensitive configuration files, internal SOAP API payloads, database export files, and proprietary data structures that your organisation's security policy prohibits sending to third-party services. You can verify this by running the tool with your browser's network inspector open — you will see zero outbound requests triggered by the formatter's parse and format operations. The only network requests on the page are for loading the static page assets themselves.