Convert YAML to TOML Online
TOML powers Cargo.toml in Rust, pyproject.toml in Python and a growing list of modern dev tools. If you have a YAML config you want to bring into one of these ecosystems — or you want to compare formats side by side — this converter renders clean TOML with proper tables, arrays of tables and inline values. Comments are dropped. Output stays close to the canonical TOML style guide.
YAML Converter - Convert Between Formats10 formats
Free YAML converter online. Convert YAML to JSON, XML, TOML, INI, Properties, CSV, and more. Also convert INI to YAML, TOML to YAML, and Properties to YAML. With automatic format detection.
Input (YAML)
Output (TOML)
Result will appear here
When you'd convert YAML to TOML
Real-world scenarios where this conversion is the right move.
Bring configs into Rust or Python
Move existing YAML configuration into a Cargo.toml, pyproject.toml or a Python tool that expects TOML.
Compare format readability
See the same data side by side in YAML and TOML to decide which format fits your project.
Migrate legacy Ansible vars
Convert structured Ansible vars to TOML for tools that prefer flat tables with section headers.
YAML vs TOML — what changes
Quick reference for the structural differences between both formats.
| Aspect | YAML | TOML |
|---|---|---|
| Lists of objects | YAML uses - markers under a key. | TOML uses [[arrays.of.tables]] headers. |
| Typing | Inferred from value syntax. | Explicit: strings quoted, numbers and dates typed. |
| Hierarchy | Pure indentation. | [section.subsection] headers, no significant whitespace. |
| Editor support | Ubiquitous in DevOps. | First-class in Rust and modern Python tooling. |
Frequently asked questions
Does the output validate as TOML?
Yes. The converter emits canonical TOML 1.0 — load it into Cargo, pip, or any TOML parser and it parses without changes.
How are nested arrays of objects handled?
They become [[arrays.of.tables]] with one block per item. Inline objects render with curly braces when shorter is clearer.
Are YAML date and timestamp types preserved?
Yes. RFC 3339 dates and timestamps map to native TOML date/time types.
What about null values?
TOML has no null. Null YAML values are omitted from the output — the key disappears.
Other conversions
Hop into another conversion that shares one of these formats.