Is my YAML data uploaded to a server?

No. The conversion runs entirely in your browser with JavaScript. Nothing is sent over the network, which makes the tool safe for sensitive data.

Are YAML anchors and merge keys supported?

Yes. Anchors, aliases and merge keys are resolved during parsing, so the resulting TOML contains the expanded values.

What happens with null values?

TOML has no null type, so null values are rejected with a clear error message telling you which value needs to be fixed.

100% local — your data never leaves your browser

YAML to TOML Converter — Free Online Tool

Convert YAML to TOML instantly in your browser. Free, private and offline-friendly: your data never leaves your device.

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Swap: TOML → YAML

YAML input

TOML output

Why convert YAML to TOML?

TOML is the configuration format of choice for tools like Cargo or pyproject.toml. Paste your YAML above and get equivalent TOML in milliseconds, without installing anything.

How it works

The converter parses your YAML locally, resolving anchors, aliases and merge keys, then serializes the result as TOML. Because TOML has no null type, null values are rejected with a clear error so you can fix them before converting.

Frequently asked questions

Is my YAML data uploaded to a server?: No. The conversion runs entirely in your browser with JavaScript. Nothing is sent over the network, which makes the tool safe for sensitive data.
Are YAML anchors and merge keys supported?: Yes. Anchors, aliases and merge keys are resolved during parsing, so the resulting TOML contains the expanded values.
What happens with null values?: TOML has no null type, so null values are rejected with a clear error message telling you which value needs to be fixed.