TOML (Tom's Obvious, Minimal Language) is a human-friendly configuration file format designed for simplicity. It uses a clear [section] header syntax, key-value pairs, and supports data types like strings, integers, floats, booleans, dates, arrays, and nested tables. It's widely used in Rust projects (Cargo.toml), Python (pyproject.toml), and many other ecosystems.

YAML (YAML Ain't Markup Language) is a data serialization format focused on readability. It uses indentation to represent nested structures, making it visually clean. YAML is commonly used for configuration files in Docker (docker-compose.yml), Kubernetes, Ansible, CI/CD pipelines (GitHub Actions, GitLab CI), and cloud infrastructure tools.

Many DevOps and cloud-native tools require YAML configuration files. If your project currently uses TOML and you need to integrate with Kubernetes, Docker Compose, Ansible, or CI/CD platforms, converting TOML to YAML bridges that gap. It's also useful for teams migrating between ecosystems or standardizing on YAML across their toolchain.

• Syntax: TOML uses [sections] and key = value pairs; YAML uses indentation and key: value.
• Readability: TOML is more explicit about structure; YAML relies on whitespace which can be error-prone.
• Data Types: TOML has native Date/DateTime types; YAML has more flexible typing including anchors and aliases.
• Comments: Both support # comments, but YAML's comment support is more universal.
• Ecosystem: TOML dominates in Rust/Python packaging; YAML dominates in DevOps/Cloud/CI-CD.

Yes! Click the Swap button to reverse the conversion direction. The tool will then accept YAML as input and produce TOML as output. Both directions are fully supported, making this a complete bidirectional config format translator.

Comments in the source file are not preserved during conversion. This is because the tool parses the input into an in-memory data structure, stripping comments, and then serializes it to the target format. If you need to retain comments, consider adding them manually to the output after conversion.

All standard TOML types are fully supported: strings (basic and literal), integers, floats, booleans, dates and datetimes (converted to ISO 8601 strings in YAML), arrays, inline tables, dotted keys, standard tables ([table]), and array of tables ([[array]]). Nested structures are faithfully preserved throughout the conversion process.

Absolutely! This TOML-to-YAML converter is 100% free with no registration required. All conversion happens entirely in your browser — your data never leaves your device. No data is uploaded, stored, or transmitted to any server. You can use it with confidence for sensitive configuration files.

It depends on your use case. TOML excels in simplicity and explicitness — great for package manifests and straightforward configs. YAML shines in complex nested configurations and is the de facto standard in DevOps. TOML is less prone to indentation errors; YAML offers more advanced features like anchors. Choose based on your ecosystem and team preferences.

You can validate the generated YAML by pasting it into any YAML validator online, or by using command-line tools like yamllint or yq. For TOML output (reverse mode), use toml-cli or any TOML linter. Our converter also performs internal validation and will display clear error messages if the input contains syntax errors.