XML formatter

Readable indentation from well-formed XML. Basic validation in the browser.

{{ xmlFormatter.message }}

Overview

XML (eXtensible Markup Language) was specified by the W3C and released as an official recommendation in 1998. The goal was to create a format readable by both humans and machines — a direct descendant of SGML (Standard Generalized Markup Language), an ISO standard from the 1980s that was far more complex. Before XML, systems exchanged data through proprietary formats, EDI (Electronic Data Interchange), or plain CSV. Everything worked, but nothing was standardized enough for communication across companies and different platforms. XML arrived with the promise of becoming the universal interchange format — and for a good while, it was exactly that.

In the first half of the 2000s, XML was practically synonymous with system integration. SOAP, RSS, Atom, SVG, XHTML, Spring configurations, Maven, Ant, NuGet — everything was XML. Large corporations adopted SOAP-based web services with XSD (XML Schema Definition) for strict validation, and XML became the lingua franca of the enterprise world. Even today, legacy systems in banking, insurance, and government agencies communicate via XML. Anyone who works with system integration learns early that XML has not died — it just stepped out of the spotlight.

XML is verbose by design. The opening and closing tag structure, the explicit attributes, the need for namespace declarations — all of what makes XML heavier than JSON is also what makes it more rigorous. A malformed XML document is simply invalid: a missing closing tag, an unescaped special character, and the parser stops completely. That can feel frustrating, but it is precisely that strictness which makes XML reliable in environments where precision is non-negotiable, such as financial messaging (ISO 20022) and legal documents.

This tool formats raw or compacted XML into a readable, indented structure. It uses the browser's native parser, which means malformed XML is rejected with an error message — unlike some online formatters that try to guess intent and produce misleading results. Useful for debugging SOAP responses, visualizing Maven or Spring configurations, inspecting RSS feeds, and working with complex SVG. Paste the XML, see the clean structure, copy it back.

Technical deep dive

Common questions summarized

  • What is this tool for?: It runs fully in your browser: useful to validate, format, or convert data in everyday development.
  • Are my inputs sent to a server?: Processing happens locally with JavaScript. We do not store what you paste into the text areas.
  • Can I use this for real production data?: Use at your own risk. For secrets (passwords, tokens), prefer controlled environments and your company policies. And always review the generated contents. Never trust blindly things you see on the internet.

Sample payload to try

  • See also the larger "Code Snippets" sample; paste this excerpt to try locally: Sample — <root><item id="1">texto</item></root>

Tool guide

  • What XML is See “JSON to XML”. “Well-formed” means balanced tags and correct syntax rules.

  • What the tool does Validates well-formed XML in the browser and applies indentation for humans.

  • Why use it Debug configs, feeds, simple SVG, or test messages without a heavy IDE.

Code Snippets

Code example
<root><item id="1">texto</item></root>

Sample

<root><item id="1">texto</item></root>

FAQ

What is this tool for?

It runs fully in your browser: useful to validate, format, or convert data in everyday development.

Are my inputs sent to a server?

Processing happens locally with JavaScript. We do not store what you paste into the text areas.

Can I use this for real production data?

Use at your own risk. For secrets (passwords, tokens), prefer controlled environments and your company policies. And always review the generated contents. Never trust blindly things you see on the internet.