TOML ↔ YAML Converter

Convert between TOML and YAML formats online. Bidirectional conversion for configuration files. Free, fast, and works in your browser.

TOML Input

YAML

About TOML and YAML Conversion

TOML and YAML are popular configuration file formats used in modern development. TOML (Tom's Obvious Minimal Language) is used by Rust's Cargo, Python's pyproject.toml, and Hugo. YAML is used by Docker Compose, Kubernetes, GitHub Actions, and many CI/CD tools. Converting between these formats is common when migrating projects or adapting configurations. This tool provides bidirectional conversion: TOML to YAML and YAML to TOML. It handles sections, nested tables, arrays, strings, numbers, and booleans. All processing happens locally in your browser.

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How to Use

Select the conversion direction (TOML→YAML or YAML→TOML)
Paste your configuration data into the input panel
Click Convert to transform the format
Copy the converted output for use in your project

Common Use Cases

Converting Cargo.toml settings to YAML for CI/CD pipelines
Migrating Docker Compose YAML to TOML format
Adapting pyproject.toml configurations for YAML-based tools
Comparing configuration formats for new projects

Frequently Asked Questions

What TOML features are supported?

The tool supports key-value pairs, sections ([section]), nested sections, arrays, inline tables, strings (quoted and bare), numbers, and booleans.

What YAML features are supported?

The tool supports key-value pairs, nested keys (indentation-based), arrays (- items and inline []), strings, numbers, booleans, and null values.

Can I convert in both directions?

Yes. Use the direction selector to switch between TOML → YAML and YAML → TOML conversion.

Does it preserve comments?

Comments are not preserved during conversion, as TOML and YAML have different comment syntaxes. Only data values are converted.