Why convert YAML to TOML?

TOML is the native format for Rust (Cargo.toml) and Python (pyproject.toml). If your CI/CD or tooling produces YAML configs, converting to TOML lets you use them directly in these project files.

Are there YAML structures that cannot be expressed in TOML?

Yes. Arrays of mixed types (e.g. [1, "two", true]), null values, and multi-document YAML streams are not supported by TOML. The tool will report these as conversion errors.

Are YAML comments preserved?

No. TOML supports comments, but the conversion process does not carry YAML comments through. Add TOML comments manually after converting.

How are YAML sequences (lists) of objects converted?

YAML sequences of objects become TOML array-of-tables (double-bracket [[table]]) notation. Simple value sequences become TOML inline arrays.

Does this tool send my data to a server?

No. All conversion is performed entirely in the browser. Your data is never sent to any server.

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YAML to TOML Conversion

Convert YAML data to TOML format. Useful for pyproject.toml and other scenarios requiring TOML. Enter text or upload a file (up to 100KB) and see real-time conversion results.

YAML Input

TOML Output

Read Only

How to use

About this tool

Converts YAML strings to TOML.

How to use

Paste YAML; the TOML output can be copied.

Use cases

• Converting YAML (e.g. K8s/CI config) to TOML for pyproject.toml • Unifying config formats • Tool config

Code Examples

YAML input example (before)

Read Only

1package:
2  name: my-app
3  version: "1.0.0"
4database:
5  host: localhost
6  port: 5432
7  enabled: true
8

TOML output example (after)

Read Only

1[package]
2name = "my-app"
3version = "1.0.0"
4
5[database]
6host = "localhost"
7port = 5432
8enabled = true
9

How it works

■ What is YAML? YAML (YAML Ain't Markup Language) is a human-readable format that uses indentation for hierarchy. Widely used in Kubernetes manifests, CI/CD (e.g. GitHub Actions), Docker Compose. ■ What is TOML? TOML (Tom's Obvious, Minimal Language) is a human-readable format for config files. It supports key=value, [sections], arrays, dates, numbers, and booleans. Widely used in Rust (Cargo.toml), Python (pyproject.toml). ■ How conversion works The tool parses YAML into an object and serializes it to TOML. All processing runs in the browser.

FAQ

Q: Why convert YAML to TOML?: A: TOML is the native format for Rust (Cargo.toml) and Python (pyproject.toml). If your CI/CD or tooling produces YAML configs, converting to TOML lets you use them directly in these project files.
Q: Are there YAML structures that cannot be expressed in TOML?: A: Yes. Arrays of mixed types (e.g. [1, "two", true]), null values, and multi-document YAML streams are not supported by TOML. The tool will report these as conversion errors.
Q: Are YAML comments preserved?: A: No. TOML supports comments, but the conversion process does not carry YAML comments through. Add TOML comments manually after converting.
Q: How are YAML sequences (lists) of objects converted?: A: YAML sequences of objects become TOML array-of-tables (double-bracket [[table]]) notation. Simple value sequences become TOML inline arrays.
Q: Does this tool send my data to a server?: A: No. All conversion is performed entirely in the browser. Your data is never sent to any server.