YAML Input

TOML Output

What is YAML to TOML Converter?

Need to convert your YAML (YAML Ain't Markup Language) configuration files to TOML (Tom's Obvious, Minimal Language)? This tool converts YAML to TOML instantly. Perfect for converting YAML config files to TOML format for Rust projects (Cargo.toml), Python projects (pyproject.toml), or any TOML-based system.

According to YAML 1.2 specification, YAML is widely used for configuration files, Docker Compose, Kubernetes manifests, and CI/CD pipelines. TOML is often used in config files (like Cargo.toml for Rust, pyproject.toml for Python). Mappings become TOML tables, lists of mappings become arrays of tables ([[name]]), unquoted dates become real TOML dates, and big integers stay integers. TOML has no null, so null values are left out and listed in a comment at the top of the output.

Everything happens in your browser – your YAML never leaves your computer.

How to Use the YAML to TOML Converter

Follow these steps to convert YAML to TOML.

Paste, Upload, or Load Sample

Paste YAML into the left panel, or click Upload to load a file. Click Sample to see example telecomm subscriber YAML. Example:

subscriber:
  subscriberId: SUB-1001
  plan: Unlimited 5G
  dataUsage: 45.2
  status: active
  carrier: Verizon

View TOML Output

The right panel shows the TOML output instantly. Objects become TOML tables, arrays stay as arrays. Ready for Cargo.toml, pyproject.toml, or any TOML-based config.

Copy or Download

Click Copy to copy to clipboard, or Download to save as .toml. Use Clear to start fresh. All processing runs in your browser.

When You'd Actually Use This

Rust Projects

Convert YAML configs to TOML for Cargo.toml files. TOML is the standard format for Rust project configuration, and this tool makes it easy to convert YAML data into TOML format.

Python Projects

Convert YAML to TOML for pyproject.toml files. Many Python tools now use TOML for configuration, and this converter helps you migrate from YAML.

Config File Migration

Migrating from YAML configs to TOML? This tool makes it easy. Convert your existing YAML configuration files to TOML format quickly.

Tool Compatibility

Some tools require TOML format. Convert your YAML data to TOML when working with tools like Cargo, Poetry, or other TOML-based systems.

Common Questions

Is my YAML data stored?

Nope. Everything happens right in your browser. Your YAML never leaves your computer – we don't even see it.

What YAML formats work?

Any YAML whose top level is a mapping, because a TOML file is always a table at the top. A top-level list or a single value gets a clear error, and so does a file with several --- documents, since TOML holds one. Integers outside the 64-bit range TOML allows are written as quoted strings and noted in a comment.

How are nested objects handled?

Nested mappings become TOML tables ([server.http]) and lists of mappings become arrays of tables ([[devices]]). Strings, numbers, booleans and dates keep their types. TOML has no null, so a key: null is left out and named in a comment at the top. A null inside a list can't be written at all, so you get an error pointing at it.

Can I convert TOML back to YAML?

Yep. Use our TOML to YAML converter to convert TOML files back to YAML format.

What if my YAML has special characters?

Special characters are properly handled in TOML. Strings with quotes or other TOML syntax characters are escaped correctly.

Does it work with large YAML files?

Yep. Since everything happens in your browser, it depends on your device. Small to medium YAML files convert instantly. Really huge files might take a few seconds.

Other YAML Tools You Might Need

Conversion is just one YAML task. Here are other tools that work well together: