Are data types preserved?

Yes. Strings, numbers, booleans, arrays, and nested objects all keep their types during conversion.

Does the converter support nested tables?

Yes. Deeply nested YAML becomes nested TOML sections like [parent.child].

How are arrays of objects converted?

They become arrays of tables ([[name]]), which is the TOML way of representing a list of grouped settings.

Are YAML comments preserved?

No. Comments cannot be reliably mapped from YAML to TOML, so they are removed during conversion.

What if my YAML is invalid?

The converter shows a clear error message pointing to the problem so you can fix the YAML before retrying.

Can I convert TOML back to YAML?

Yes, there's a separate TOML to YAML tool for the reverse direction.

YAML to TOML Converter Online

What is YAML to TOML Conversion?

YAML to TOML conversion takes a YAML config file and rewrites it in TOML, a config language designed to be obvious to read. TOML uses sections in square brackets, key-value pairs with equals signs, and explicit types. A yaml to toml converter handles the syntax change so you don't have to retype the structure manually. If you've used Rust (Cargo.toml) or modern Python (pyproject.toml), you've already worked with TOML. It's the format teams pick when they want config files that are easy to edit and hard to mess up.

Why Convert YAML to TOML?

TOML is everywhere in modern toolchains, including Rust's Cargo, Python's Poetry and Hatch, Hugo, and a long list of Go and Rust projects. If your config currently lives as YAML and the tool you're feeding it into expects TOML, a yaml to toml conversion is the fastest way across. Common reasons to convert yaml to toml: migrating a YAML-based config to a tool that requires TOML, generating Cargo.toml or pyproject.toml from existing settings, producing readable configs that diff cleanly in git, and standardizing on TOML across a polyglot codebase.

How Our YAML to TOML Converter Works

When you click Convert, the tool parses your YAML, figures out which parts should be top-level keys versus tables (TOML sections), and writes them out with the right syntax. Strings get quoted, numbers and booleans keep their types, and nested objects become [section] headers. Arrays become inline arrays or arrays of tables, depending on shape. The conversion runs in your browser. Nothing leaves your machine.

Features You Get

Section detection: nested YAML objects automatically become TOML tables.
Type preservation: strings, ints, floats, booleans, and dates each get the right TOML syntax.
Array of tables support: lists of objects are written as [[section]] blocks.
Validation: invalid YAML shows a clear error message so you can fix it.
Upload support: load a .yaml or .yml file from your device or drag-and-drop it into the input.
One-click copy: grab the TOML output with the Copy button and paste it into your config file.

How to Use the Tool

Paste your YAML into the input editor, or use the Upload File button to load a .yaml or .yml file.
Click the Convert button to generate the TOML output.
Verify the section headers and table-array blocks match what your tool expects.
Click the Copy button to copy the TOML to your clipboard.

Common Use Cases

Rust projects: building Cargo.toml from a YAML config you already had.
Python projects: generating pyproject.toml from existing tool configs.
Static site generators: moving Hugo or Zola config from YAML to TOML.
Polyglot repos: standardizing on TOML across services that started in different formats.

Example Conversion

Input (YAML)

server:
  host: localhost
  port: 3000
  features:
    - auth
    - billing

Output (TOML)

[server]
host = "localhost"
port = 3000
features = ["auth", "billing"]

Frequently Asked Questions

Related Converters

TOML to YAML YAML to JSON YAML to CSV