XML Formatter & Validator – Free, Fast & Private
Format, validate, and highlight your XML structure directly in your browser — with instant error detection. Your data never leaves your device.
XML Input
Output
Formatted XML will appear here.
Why Use Tools Oasis XML Formatter?
Unlike online XML validators that upload your data to remote servers, Tools Oasis performs all validation and formatting directly in your browser — safe, private, and fast.
Formatting latency
XML validation and formatting happens in milliseconds, entirely in your browser.
In-Browser Processing
All logic runs in JavaScript locally — zero server calls, zero latency from network round-trips.
Secure by Default
No logging, no telemetry, no account needed. Your code and data stay yours.
Works Offline
Once the page has loaded, every tool works without an internet connection.
Frequently Asked Questions
01 What is XML and what is it used for?
XML (eXtensible Markup Language) is a markup language designed to store and transport data in a structured, human-readable format. It is widely used for configuration files, web services (SOAP), RSS feeds, data interchange between systems, and document storage formats like SVG and XHTML.
02 How do I prettify XML code?
Simply paste your XML into the input field and click "Format & Validate." The tool will automatically indent nested elements, add proper line breaks, and produce a clean, readable structure — all processed instantly in your browser.
03 What are the differences between XML and JSON?
XML uses opening and closing tags to define data structure, while JSON uses key-value pairs with curly braces and brackets. JSON is generally more compact and easier to parse in JavaScript, while XML supports attributes, namespaces, and mixed content. JSON is preferred for APIs, while XML remains common in enterprise systems and configuration files.
04 Is my XML data uploaded to any server?
No. All formatting and validation happen locally in your browser — your XML never leaves your device or gets uploaded to any server. Tools Oasis is 100% client-side, ensuring complete privacy for your data.