Free TOON to YAML Converter Online
TOON to YAML for when a compact TOON payload has to become a manifest or pipeline file. Keys carry over as-is, and a broken document shows the parse error.
TOON Input
YAML Output
What Is TOON to YAML?
If you've been working with TOON (Token-Oriented Object Notation) — the compact format built for LLM output — and need to drop that data into a YAML-based system, reformatting by hand is a real pain. YAML is the config language behind Kubernetes manifests, Docker Compose files, CI pipelines, and much more. This conversion runs completely in your browser — nothing is sent to any server. The YAML 1.2 specification defines the exact output format. For more on structured data formats, the MDN guide to structured data is a useful reference.
Paste TOON and you get the same records back as YAML, ready for a manifest or a config file. The parsing and the YAML output are both produced in this tab, so nothing you paste is uploaded. The YAML 1.2 spec defines the output format. For JSON instead, use TOON to JSON.
TOON to YAML Examples
Convert TOON to YAML. Telecom-themed example:
Example: Subscriber records
YAML output:
Click the Sample button above to load more examples into the editor.
How to Use This Tool
Paste or Upload TOON
Copy your TOON and paste it into the left editor. You can also click Upload to load a .toon or .txt file. The Sample button loads example data. Invalid TOON will show an error.
View YAML Output
YAML appears in the right-hand pane: TOON keys carry over as YAML keys, and nesting is expressed through indentation. A malformed TOON document produces an error message there instead.
Copy or Download
Copy hands you the YAML text, ready to drop into a manifest; Download writes the same thing to converted.yaml. For TOON to JSON, use TOON to JSON. For TOON formatting, use TOON Formatter.
When you receive TOON from an LLM or AI system but need to use it in a YAML-based workflow (e.g. Kubernetes, Docker Compose, CI config), this conversion helps. YAML is easier to read and edit for config. Converting here gives you standard YAML.
When you receive TOON from an LLM or AI system but need to use it in a YAML-based workflow (e.g. Kubernetes, Docker Compose, CI config), this conversion helps. YAML is easier to read and edit for config. Converting here gives you standard YAML.
Frequently Asked Questions
Does the TOON I paste stay on my machine?
Yes, completely. The conversion runs inside your browser only. Nothing you type is sent to our servers — your data stays on your device.
What's the practical difference between TOON and YAML?
TOON is compact and token-efficient, built for LLM output. YAML is human-friendly and indentation-based, widely used in Kubernetes, Docker Compose, and CI config files. Use this tool when your source is TOON but the system downstream expects YAML.
Does the conversion preserve the full structure?
Yes. Objects, arrays, strings, numbers, and booleans all convert correctly. Nested structures become properly indented YAML blocks.
Can I convert to JSON instead of YAML?
Absolutely. Use TOON to JSON for JSON output. Both conversions are lossless.
What happens to YAML comments in the conversion?
TOON has no comment syntax, so the converted YAML will not contain any comments. You can add them manually after the conversion if you need them.