Convert YAML to TOML online, free. YAML is an indentation-based superset of JSON favoured for human-edited config. TOML is a readable configuration format built around key/value pairs and tables. YAML to TOML conversion parses your YAML against the YAML 1.2.2 grammar (https://yaml.org/spec/1.2.2/), builds an in-memory model of its keys, nested objects and arrays, then re-serializes it as valid TOML following the TOML v1.0.0 conventions. Processing runs in your browser in JavaScript with no upload or server round-trip — no size limit beyond your device's memory, so multi-megabyte documents convert in milliseconds and sensitive payloads never leave your machine. Typical uses include Rust Cargo & Python pyproject config, app settings files and tool configuration.
It maps the full structure of your YAML onto well-formed TOML, following the TOML v1.0.0 conventions. 100% free, no registration, and complete privacy — everything runs locally in your browser, so your data never touches a server.
Paste YAML and convert TOML immediately. Conversion runs client-side, so there is no upload wait and large documents stay fast.
Nested YAML objects, tables and arrays are mapped faithfully onto TOML.
Your YAML never leaves your device — everything is processed locally in JavaScript, with nothing logged or stored.
Unlimited conversions with no account, no quotas, and no watermark. Works on desktop and mobile.
A YAML document and its TOML equivalent:
YAML input:
name: Alice
age: 30
email: [email protected]Output:
name = "Alice"
age = 30
email = "[email protected]"Paste your YAML into the editor and press "Convert to TOML". The tool parses it against the YAML 1.2.2 grammar, then re-serializes it as TOML following TOML v1.0.0 conventions — instantly and entirely in your browser. You can validate or format the YAML first to be sure it is clean.
YAML anchors and aliases are expanded and comments are dropped before TOML is produced, and indentation defines the structure. Note that YAML 1.1 treats words like "yes" and "no" as booleans, so quote them if you want strings.
Numbers, booleans and null are preserved as native TOML types wherever TOML supports them, so standard documents convert losslessly and can be read back into the same structure.
YAML (YAML Ain't Markup Language) (YAML) — YAML is an indentation-based superset of JSON favoured for human-edited config. TOML (Tom's Obvious Minimal Language) (TOML) — TOML is a readable configuration format built around key/value pairs and tables. This converter maps the structure of your YAML onto TOML so you can use it for Rust Cargo & Python pyproject config.
Yes. Invalid YAML is flagged with a clear error before anything is converted. Common YAML problems to check are spaces (never tabs) for indentation, consistent indent levels, and no duplicate keys. Starting from clean input keeps the generated TOML accurate.
Yes. The entire YAML-to-TOML conversion runs locally in your browser in JavaScript — your YAML is never uploaded, logged or stored. That matters when the data is something like Kubernetes & Docker Compose manifests, which should not leave your machine.
The generated TOML is ready for Rust Cargo & Python pyproject config, app settings files and tool configuration. Copy or download it and drop it straight into your tooling.
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