YAML to XML Converter — Free Online YAML→XML Tool

Paste any YAML and get a structured XML document in seconds. Runs 100% in your browser with the open-source js-yaml and fast-xml-parser libraries (MIT) — no upload, no sign-up. Supports nested objects, arrays, strings, numbers, booleans and null, with automatic indentation and a root wrapper element. Perfect for converting Kubernetes YAML and Docker Compose configs into XML for legacy systems, SOAP web services or RSS feeds — private, free, instant.

YAML input Anchor

XML output

Converted XML will appear here…

How to use

Paste or type your YAML into the left box — a sample is already loaded on first visit.
The right side updates live as you type (debounced ~250 ms).
Use Copy XML to copy the result to your clipboard, or Download .xml to save it locally.
The left input is remembered in your browser, so you can come back and keep editing.

What is it

YAML describes data with indentation and colons; XML describes it with angle brackets and tag names. YAML is more concise and human-friendly, but many legacy systems and services only accept XML. This tool parses your YAML into a JavaScript object with js-yaml, then builds a nicely indented XML document using fast-xml-parser.

Notes & fun facts

YAML is a human-friendly data serialization format proposed in 2001. It uses indentation instead of curly braces, colons instead of key-value separators, and dashes instead of array symbols, removing all the repetitive angle brackets and closing tags of XML. Today YAML is practically the de facto standard for cloud-native configuration: Docker Compose, Kubernetes, GitHub Actions and Ansible are all YAML. But many legacy systems and services still output XML — SOAP web services, RSS feeds, legacy config files. When you need to convert YAML configs into XML for a legacy system, or import cloud-native config into a tool that only accepts XML, you need a fast, local, server-free tool. This tool does it locally in your browser with js-yaml and fast-xml-parser, ready to copy and use.

Origin & history

YAML 1.0 was proposed by Clark Evans in 2001. js-yaml is an MIT-licensed YAML parser/serializer open-sourced in 2011. fast-xml-parser is an MIT-licensed XML parser/builder open-sourced in 2017 — both are zero-dependency, browser-friendly modern implementations.