Data & Dev Config • Zero-Server RAM Execution

Convert TOML to YAML Online - Free, Local & Instant

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

TOML → YAML ⇄ Swap (YAML → TOML)

Indent: Auto-type

Input TOML (Paste or Drop File) 📂 Open File

Converted YAML Output

Technical Comparison: TOML vs YAML

Data & Dev Config

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

TOML to YAML — Before & After Example

Before (TOML Input)

[app]
name = "my-service"
version = "1.4.2"
port = 8080
debug = false

[database]
host = "localhost"
port = 5432
user = "admin"
password = "s3cr3t"
pool_size = 10

[cache]
enabled = true
ttl_seconds = 3600

After (YAML Output)

app:
  name: my-service
  version: 1.4.2
  port: 8080
  debug: false
database:
  host: localhost
  port: 5432
  user: admin
  password: s3cr3t
  pool_size: 10
cache:
  enabled: true
  ttl_seconds: 3600

Frequently Asked Questions: TOML to YAML

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

Paste your TOML data or drag and drop a .toml file into the converter above. ZeroUpload parses TOML and serializes YAML 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 TOML and YAML? ▾

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

Is this TOML to YAML 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 TOML, database exports, and production secrets.

Can I convert YAML back to TOML? ▾

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