TOML to YAML Converter

Convert TOML configuration files to YAML format with type preservation and schema detection.

TOML to YAML

TOML: 0 lines | YAML: 0 lines

How to Use

  1. Paste TOML — Paste or type TOML configuration in the input area.
  2. Auto-convert — The YAML output updates automatically. Data types and nested structures are preserved.
  3. Copy result — Click the Copy button to copy the YAML output to your clipboard.

Frequently Asked Questions

Is my data sent to a server?

No. All processing happens 100% client-side in your browser. Your data never leaves your device.

What TOML features are supported?

All standard TOML v1.0 data types are supported: strings, numbers, booleans, dates, inline arrays, inline tables, and nested tables.

How are nested TOML tables converted?

Nested and dotted TOML tables become indented YAML mapping blocks, and [[array-of-tables]] become YAML sequences of maps. The original structure is preserved.

Are comments preserved?

Comments cannot be preserved reliably because YAML and TOML syntax differ. All active data is converted and the output is valid YAML you can use immediately.

Does the converter keep data types and dates?

Yes. Strings, integers, floats, booleans, and datetimes keep their types in the output so configuration-driven programs behave the same as with the original TOML.

Is there a YAML to TOML converter?

Yes! Check out the YAML to TOML Converter for the reverse operation.

What Is TOML?

TOML (Tom's Obvious, Minimal Language) is a configuration file format designed to be easy to read and write for humans while remaining unambiguous for machines. It uses an INI-inspired syntax of key-value pairs grouped into [tables] and [[array-of-tables]], and is the default configuration format for tools like Rust’s Cargo, Python’s pyproject.toml, and many Go and Python applications.

Because TOML deliberately supports a limited set of data types — strings, integers, floats, booleans, datetimes, arrays, and tables — it stays predictable. There are no arbitrary object references or aliases, which keeps parsing fast and errors rare.

What Is YAML?

YAML (YAML Ain’t Markup Language) is a human-readable data serialization standard widely used for configuration, data exchange, and infrastructure-as-code files such as Docker Compose, GitHub Actions, Kubernetes manifests, and CI/CD pipelines. It uses indentation-based nesting instead of brackets, and supports anchors, aliases, complex keys, and multiple document separators.

Those extra features are powerful, but also make YAML a common source of subtle bugs. Converting from TOML produces clean, indentation-driven YAML where the original structure and typing are preserved without ambiguity.

Why Convert TOML to YAML?

  • Compatibility with a YAML ecosystem — Kubernetes, Docker Compose, GitHub Actions, and Terraform expect YAML. Convert only once here.
  • Readability and tooling — Some editors, linters, and diff tools are YAML-first; a YAML file integrates with them natively.
  • Richer serialization — YAML supports features (anchors, multiple documents) that TOML does not, letting you extend a config beyond TOML’s limits.
  • Team conventions — Standardize on a single config format across your team’s projects without hand-editing each file.

Common Use Cases

  • Migrating a Rust Cargo.toml-style configuration to a YAML-based pipeline or orchestrator.
  • Moving a Python application’s app.toml into an Ansible or Docker Compose environment that consumes YAML.
  • Generating a readable YAML representation of an existing TOML template for documentation.
  • Preparing TOML data to be merged with anchors and other YAML-only constructs.

TOML to YAML Conversion Example

TOML

title = "Example config"

[server]
host = "127.0.0.1"
port = 8080
enabled = true

[server.ssl]
cert = "server.crt"
key = "server.key"

[[users]]
name = "ada"
level = 3

[[users]]
name = "grace"
level = 1

YAML

title: Example Application
server:
  host: 127.0.0.1
  port: 8080
  enabled: true
  ssl:
    cert: server.crt
    key: server.key
users:
  - name: ada
    level: 3
  - name: grace
    level: 1

Notice how nested tables become nested blocks and [[array-of-tables]] becomes a YAML sequence of maps — structure and data types survive the conversion unchanged.

Other Data Format Converters

If you convert data formats regularly, these related tools will also save you time:

YAML to TOML Converter

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YAML Formatter

Format and beautify YAML code.

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Have a suggestion, question, or feature request for this tool? Email com.help2code@gmail.com — we read every message.