Convert YAML to TONL with our free online converter.
Use the converter below or open in full converter with more options.
The output below was generated by the same conversion code the converter uses, run on this sample when the page was built.
service:
name: checkout-api
image: registry.example.com/checkout:2.4.1
replicas: 3
env:
LOG_LEVEL: info
DB_POOL_SIZE: 10
ports:
- 8080
- 9090
healthcheck:
path: /healthz
intervalSeconds: 15#version 1.0
root{env,healthcheck,ports,service}:
env{DB_POOL_SIZE,LOG_LEVEL}:
DB_POOL_SIZE: 10
LOG_LEVEL: info
healthcheck{intervalSeconds,path}:
intervalSeconds: 15
path: /healthz
ports[2]: 8080,9090
service{image,name,replicas}:
image: "registry.example.com/checkout:2.4.1"
name: checkout-api
replicas: 3TONL output is 66% larger than the YAML input. The same data is 214 characters as minified JSON and 295 as pretty-printed JSON. Sizes are character counts, not tokens: token counts depend on the model's tokenizer (see the tokenizer comparison).
YAML is a human-friendly data serialization format. It uses indentation instead of brackets, making configuration files more readable.
TONL (Token-Optimized Notation Language) is a compact text format that maps one-to-one to JSON and ships with a query API, schema validation, and streaming. Savings are roughly 32-45% versus JSON in the TONL project's own measurements.
Use TONL when you want a compact text format plus tooling around it: querying, schema validation, or streaming. For plain prompt compression, TOON is usually the simpler choice.
Paste your YAML into the editor on json2toon.co. The tool detects the input and produces TONL instantly, then you copy the result. Conversion runs entirely in your browser, so nothing is uploaded to a server.
Yes. Converting YAML to TONL on json2toon.co is free with no account, signup, or usage limit. A free public API is also available for automated, programmatic conversion.
Convert YAML to TONL with our free online converter.
TONL output starts with #version 1.0 and a root key, lists field names in braces, and sorts keys alphabetically. On small payloads the header and per-object field lists make it larger than TOON; TONL earns its place through its query, schema, and streaming tooling.
Yes. The YAML to TONL conversion happens client-side in your browser. Your source data stays on your device and is never sent to or stored on a server, which makes it safe for private or sensitive payloads.