DiffCheck

YAML ↔ TOML Converter Online

Convert YAML to TOML and TOML to YAML instantly in your browser.

INPUT — YAML
OUTPUT — TOML

What Is YAML ↔ TOML Converter?

YAML ↔ TOML Converter transforms configuration files between YAML and TOML formats entirely in your browser. Paste a YAML document to get valid TOML output, or paste a TOML file to get clean YAML. The converter handles nested objects, arrays, strings, numbers, booleans, and dates — making it easy to migrate configuration files between projects that use different formats.

How to Use YAML ↔ TOML Converter

  1. Select the conversion direction: YAML → TOML or TOML → YAML.
  2. Paste your input into the left editor, or click Load Sample to use an example.
  3. Click Convert to run the conversion.
  4. Review the output in the right editor and click Copy to copy it.

Features

  • Bidirectional — YAML to TOML and TOML to YAML
  • Nested structures — handles deeply nested objects and arrays
  • Type preservation — strings, integers, floats, booleans, dates
  • Sample data — one-click example for each direction
  • Browser-only — no data sent to any server

FAQ

What is the difference between YAML and TOML?

YAML uses indentation to express structure and supports complex data types like anchors and aliases. TOML uses explicit section headers ([table]) and key = value pairs, making it more readable for flat configuration files. TOML is commonly used in Rust projects (Cargo.toml) and Hugo, while YAML is popular in Kubernetes, Docker Compose, and CI/CD pipelines.

Are there data types that cannot be converted between YAML and TOML?

YAML supports anchors, aliases, and multi-document streams which have no TOML equivalent. TOML requires the root to be a table (object), so a YAML file whose root is a list or scalar cannot be converted to TOML directly.

Does TOML support nested objects?

Yes. TOML supports nested tables using dotted keys (a.b = 1) or section headers ([a.b]). The converter handles nested YAML mappings and outputs them as TOML tables.

What happens to YAML comments during conversion?

Comments are not part of the parsed data model in either format, so they are lost during conversion. Only the data values are preserved.