0U
ZeroUpload
Data & Dev Config • Zero-Server RAM Execution

Convert YAML to TOML Online - Free, Local & Instant

Instant YAML (.yaml) to TOML (.toml) converter. 100% client-side processing in your browser RAM — zero file uploads, full privacy, drag & drop or paste raw text.

YAML → TOML ⇄ Swap (TOML → YAML)

Technical Comparison: YAML vs TOML

Data & Dev Config
Specification YAML (Source) TOML (Target)
Full Specification YAML Ain't Markup Language Tom's Obvious, Minimal Language v1.0
File Extension & MIME .yaml (application/x-yaml) .toml (application/toml)
Data Typing Model Rich dynamic typing (scalars, sequences, mappings) Strong (strings, integers, floats, booleans, RFC 3339 dates, arrays)
Structure & Hierarchy Indentation-based nested hierarchy Section tables [table] and [[array_of_tables]]
Comments Support Supported (# inline and block comments) Supported (# comment)
Primary Ecosystem Kubernetes manifests, Docker Compose, GitHub Actions, Ansible Rust Cargo.toml, Python pyproject.toml, Hugo static sites

YAML to TOML — Before & After Example

Before (YAML Input)
- id: 1
  name: Alice Johnson
  email: alice@example.com
  role: admin
  active: true
  score: 98.5
  address:
    city: Berlin
    country: DE
- id: 2
  name: Bob Smith
  email: bob@example.com
  role: editor
  active: false
  score: 87
  address:
    city: Austin
    country: US
- id: 3
  name: Chiara Rossi
  email: chiara@example.com
  role: viewer
  active: true
  score: 91.25
  address:
    city: Milan
    country: IT
After (TOML Output)
[[items]]
id = 1
name = "Alice Johnson"
email = "alice@example.com"
role = "admin"
active = true
score = 98.5

[items.address]
city = "Berlin"
country = "DE"

[[items]]
id = 2
name = "Bob Smith"
email = "bob@example.com"
role = "editor"
active = false
score = 87

[items.address]
city = "Austin"
country = "US"

[[items]]
id = 3
name = "Chiara Rossi"
email = "chiara@example.com"
role = "viewer"
active = true
score = 91.25

[items.address]
city = "Milan"
country = "IT"

Frequently Asked Questions: YAML to TOML

How do I convert YAML to TOML online without uploading sensitive files? ▾

Paste your YAML data or drag and drop a .yaml file into the converter above. ZeroUpload parses YAML and serializes TOML 100% inside your browser RAM using local JavaScript—no bytes are ever sent to an external server.

How are nested objects or tabular columns mapped between YAML and TOML? ▾

When converting hierarchical structures (Indentation-based nested hierarchy) and tabular or config formats (Section tables [table] and [[array_of_tables]]), our engine automatically flattens or unflattens dot-separated keys (such as address.city) and preserves numbers, booleans, arrays, and null values.

Is this YAML to TOML converter free for commercial and production config files? ▾

Yes. The tool is completely free, requires no account or API key, and works offline once loaded. Because execution happens in local memory, it is safe for proprietary YAML, database exports, and production secrets.

Can I convert TOML back to YAML? ▾

Yes! Click the "Swap (TOML → YAML)" button at the top of the workspace or use the reverse converter link at the bottom of this page for bidirectional conversion.