TOML to YAML Converter Online

Convert TOML configuration files to YAML format instantly in your browser. Everything runs client-side, so your data remains completely private.

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TOML ↔ JSON/YAML Converter

Convert between TOML, JSON, and YAML formats. Perfect for Cargo.toml, pyproject.toml, and configuration files.

Indent:

TOML Input

About TOML ↔ JSON/YAML Conversion

TOML (Tom's Obvious Minimal Language) — simple config format used by Cargo (Rust), pyproject.toml (Python), Hugo, and many CLI tools.
JSON — strict key-value format for APIs, data exchange, and tooling configs like package.json and tsconfig.json.
YAML — indentation-based format popular for Kubernetes, Docker Compose, and CI/CD pipelines.
TOML requires a table (object) at the root — arrays and primitives are not valid top-level values.
Everything runs in your browser — no data is sent over the network.

When to convert TOML to YAML

You may need to convert TOML to YAML when migrating project configurations between ecosystems. For example, moving settings from a Rust project's Cargo.toml into a Docker Compose or Kubernetes YAML file. Both formats are human-friendly, but different tools expect different formats, making conversion a common task in DevOps workflows.

Differences between TOML and YAML

TOML uses explicit table headers and key-value pairs with clear delimiters, making it resistant to indentation errors. YAML relies on indentation for structure, which is more concise but can lead to subtle bugs. YAML supports more data types and features like anchors, while TOML focuses on simplicity and unambiguous parsing.

Frequently Asked Questions

Is TOML to YAML conversion lossless?

For data content, yes — all values, tables, and arrays convert cleanly. However, TOML comments and inline table formatting are not preserved since they are not part of the data model.

Which tools use TOML vs YAML?

TOML is used by Cargo (Rust), Poetry and PEP 621 (Python), and Hugo. YAML is used by Docker Compose, Kubernetes, Ansible, GitHub Actions, and many CI/CD systems. Converting between them is common in polyglot projects.