YAML to TOML Converter
Convert YAML to TOML format instantly
YAML Input
TOML Output
What Is YAML to TOML?
TOML (Tom's Obvious Minimal Language) is a config format used by Cargo (Rust), Poetry (Python), and many other tools. YAML and TOML both suit config; TOML is more explicit with [section] headers. Converting YAML to TOML maps keys to TOML tables and values.
This tool parses your YAML and outputs equivalent TOML. Conversion runs entirely in your browser. Nothing is sent to a server. For JSON to TOML, use JSON to TOML. The YAML spec and TOML spec define the formats.
YAML to TOML Examples
Convert YAML to TOML. Telecom-themed example:
Example: Subscriber record
TOML output:
Click the Sample button above to load more examples into the editor.
How to Use This Tool
Paste or Upload YAML
Copy your YAML and paste it into the left editor. You can also click Upload to load a .yaml or .yml file. The Sample button loads example data. Invalid YAML will show an error.
View TOML Output
The right panel shows the converted TOML. YAML keys become TOML keys; nested objects become [section] tables. Arrays become TOML arrays. Invalid YAML will show an error in the output.
Copy or Download
Use Copy or Download. For JSON to TOML, use JSON to TOML. For YAML formatting, use YAML Formatter.
When YAML to TOML Helps
When migrating config from YAML to a TOML-based project (e.g. Rust with Cargo, Python with Poetry), or when a tool expects pyproject.toml or Cargo.toml style config, this conversion helps. Kubernetes and Docker Compose use YAML; many language ecosystems use TOML. Converting here bridges the gap.
TOML is more explicit and has a stricter structure. Some prefer it for config because it's less ambiguous than YAML. If your source is YAML (e.g. from a shared config repo) but the target is TOML, paste it here. For JSON to TOML, use JSON to TOML.
Frequently Asked Questions
When to use TOML vs YAML?
TOML is used by Rust (Cargo), Python (Poetry), and many CLI tools. YAML is common in Kubernetes, Docker Compose, and CI/CD. Use this tool when you need to convert between them—e.g. sharing config across ecosystems.
Does TOML support nested tables?
Yes. TOML uses [section.subsection] for nesting. The converter maps YAML nesting to TOML table headers. Deep nesting is supported.
Is my data private?
Yes. Conversion runs entirely in your browser. No data is sent to any server.
What about YAML anchors?
YAML anchors and aliases are resolved during conversion. The output TOML contains the expanded structure. TOML has no equivalent for anchors.
Comments preserved?
TOML uses # for comments. YAML comments may not always map cleanly—the converter focuses on structure and data. Check the output and add comments if needed.
Related Tools
TOML. YAML spec. JSON spec. TOML GitHub. YAML quick reference.