YAML to TOML Converter
Paste a YAML document to instantly convert it into equivalent TOML, with nested mappings becoming tables and sequences becoming arrays. Free online developer tool.
Paste YAML
TOML Output
TOML output will appear here...
Free YAML to TOML Converter
Paste a YAML document to instantly convert it into equivalent TOML. Nested mappings become TOML tables and sequences become TOML arrays, so the structure of your config carries over cleanly.
How to Use It
Paste any YAML configuration into the input box, or click "Load Example" to see a sample run. The converter parses your YAML and renders the resulting object as TOML, updating live as you type.
Example
Given a YAML document with a top-level title key and an owner mapping containing a nested address mapping, the tool produces TOML with title at the root, an [owner] table, and a nested [owner.address] table — matching the YAML's structure.
Common Use Cases
- Migrating a Kubernetes-style or Docker Compose YAML config into TOML for a Rust or Python project.
- Converting YAML application settings to a
Cargo.tomlorpyproject.tomlstyle format. - Comparing YAML and TOML representations of the same configuration side by side.
- Bootstrapping a TOML config file from an existing YAML one instead of retyping it by hand.
FAQs
Does this handle nested mappings and lists correctly?
Yes — standard YAML mappings, nested mappings, and lists (including lists of mappings, which become TOML arrays of tables) convert reliably for typical configuration files. Very unusual YAML features like anchors, aliases, or multi-document streams are uncommon in practice, but it's worth a quick visual check of the output for anything highly nonstandard.
What happens to YAML null values?
TOML has no native null type, so keys with a null value in the YAML source cannot be represented as-is — review the output for any such keys and decide how you want them handled in the TOML version.
Is my YAML uploaded anywhere?
No — parsing and conversion happen entirely client-side in your browser. Nothing you paste is sent to a server.