TOML to YAML Converter

Input TOML

or drop a file anywhere

Output YAML

Your YAML appears here as you type.

Paste data to see token savings

Convert TOML to YAML with our free online converter.

Example: TOML input and real YAML output

The output below was generated by the same conversion code the converter uses, run on this sample when the page was built.

TOML input (155 characters)

[package]
name = "invoice-tool"
version = "0.3.2"
edition = "2021"

[dependencies]
serde = "1.0"
tokio = "1.40"

[profile.release]
lto = true
opt-level = 3

YAML output (160 characters)

package:
  name: invoice-tool
  version: 0.3.2
  edition: '2021'
dependencies:
  serde: '1.0'
  tokio: '1.40'
profile:
  release:
    lto: true
    opt-level: 3

YAML output is 3% larger than the TOML input. The same data is 165 characters as minified JSON and 244 as pretty-printed JSON. Sizes are character counts, not tokens: token counts depend on the model's tokenizer (see the tokenizer comparison).

TOML to YAML: what changes

Strings that look like numbers (edition '2021', serde '1.0') stay quoted in YAML so they are not re-read as numbers.
Reading TOML: A TOML document always parses to a table (an object), never a bare array. Datetimes are a TOML-native type and come out as ISO 8601 strings.
Writing YAML: Strings that would otherwise change type on re-read, such as '2021' or '1.0', are quoted. No comments are generated.

About TOML

TOML is a config file format with explicit types. It's the official format for Python's pyproject.toml and Cargo's Cargo.toml.

✓Explicit types
✓Standard in Python/Rust
✓Unambiguous
✓Easy to parse

Full TOML Documentation →

About YAML

YAML is a human-friendly data serialization format. It uses indentation instead of brackets, making configuration files more readable.

✓Human readable
✓No punctuation
✓Supports comments
✓Great for config

Full YAML Documentation →

Why Convert TOML to YAML?

Use YAML for configuration files, especially in DevOps (Docker, Kubernetes, GitHub Actions). It's more readable than JSON but can have ambiguity with indentation.

TOML to YAML: Frequently Asked Questions

How do I convert TOML to YAML?

Paste your TOML into the editor on json2toon.co. The tool detects the input and produces YAML instantly, then you copy the result. Conversion runs entirely in your browser, so nothing is uploaded to a server.

Is the TOML to YAML converter free?

Yes. Converting TOML to YAML on json2toon.co is free with no account, signup, or usage limit. A free public API is also available for automated, programmatic conversion.

Why convert TOML to YAML?

Convert TOML to YAML with our free online converter.

What should I watch out for when converting TOML to YAML?

Strings that look like numbers (edition '2021', serde '1.0') stay quoted in YAML so they are not re-read as numbers.

Is my data safe when I convert TOML to YAML?

Yes. The TOML to YAML 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.