TOML to YAML Converter — Free Online TOML to YML Tool & Validator

TOML to YAML Converter — Free Online TOML to YML Tool & Validator. Free online TOML to YAML converter. Paste or upload a .toml file and get clean YAML instantly, with TOML syntax validation, 2/4-space indent, key sorting and download — 100% in your browser.

Our free TOML to YAML converter turns any TOML document into clean, readable YAML the moment you paste it.

Drop in a pyproject.toml, Cargo.toml, Hugo or Netlify config, or upload a .toml file straight from your disk, and the tool will convert TOML to YAML online with nested tables mapped to YAML mappings, arrays of tables ([[workers]]) mapped to YAML sequences, and TOML dates, times, integers, floats and booleans kept as proper typed values.

Choose a 2- or 4-space indent, sort keys alphabetically for stable diffs, then copy the result or download it as converted.yaml. Need the opposite direction? Use our YAML to TOML Converter.

The converter doubles as a TOML validator and TOML syntax checker: if your input cannot be parsed, you get the exact error with its line and column instead of an empty output, so you can fix a missing quote, a duplicate key or a redefined table in seconds.

A small summary shows how many keys, tables and arrays your file contains. Wondering about TOML vs YAML?

TOML is explicit and great for hand-edited app config, while YAML is the lingua franca of Kubernetes manifests, Docker Compose files, GitHub Actions and Ansible playbooks — this TOML to YML tool lets you move settings between both worlds without rewriting them by hand.

Every conversion runs locally in your browser. Your secrets, connection strings and internal infrastructure settings are never uploaded to a server, and the tool keeps working offline once the page has loaded.

Load the sample to see how it works, or share a link that restores your TOML and options for a teammate. Related tools: TOML to JSON, YAML Viewer, JSON to YAML Converter and YAML to JSON Converter.

Frequently asked questions

How do I convert TOML to YAML?

Paste TOML into Your TOML or click Upload .toml to load a file. The YAML output appears on the right as you type; click Copy YAML, or Download .yaml to save it as converted.yaml. Load sample shows an example config.

How are TOML tables and arrays of tables converted?

Tables and inline tables become YAML mappings, arrays become sequences, and arrays of tables such as [[workers]] become a sequence of mappings. Strings, numbers and booleans keep their types, while dates and times are written as ISO 8601 text.

What do the Indent and Sort keys options do?

Indent sets 2 (the default) or 4 spaces per nesting level. Sort keys orders mapping keys alphabetically, which keeps the output stable when you compare versions of a file.

Can I use it as a TOML validator?

Yes. If the input cannot be parsed, an Invalid TOML message shows the parser error with its line and column, for example for a missing quote or a duplicate key. Valid input shows key, table and array counts under the output.

Is my TOML data uploaded?

No. Parsing and conversion run in your browser, including for files you upload, so secrets and connection strings in your config stay on your device.

How do I convert YAML back to TOML?

Click the Need the reverse? Convert YAML to TOML link below the tool, which opens the YAML to TOML converter. For JSON output from the same TOML, use the TOML to JSON tool.

How to use this online tool

TOML to YAML Converter — Free Online TOML to YML Tool & Validator is designed for fast browser workflows when you need to format, validate, convert, decode, encode, generate, or inspect data without opening a heavy desktop app. Start with the input field or visible options, review the result, then copy or download the output for the next step.

Private processing in your browser

TOML to YAML Converter — Free Online TOML to YML Tool & Validator keeps the normal processing step local in your browser. That is useful for code snippets, tokens, documents, configuration values, text samples, and other material that should not be sent to a remote service unless you explicitly choose to share it.

When this tool is useful

Use TOML to YAML Converter — Free Online TOML to YML Tool & Validator for repeatable developer tasks, technical documentation, QA checks, quick conversions, debugging, content cleanup, and internal team workflows. The page focuses on clear inputs, immediate feedback, and output that is easy to reuse in code, reports, tickets, emails, or notes.

Practical tips

Before copying the final result, check important details such as spacing, casing, filenames, encoding, token structure, line breaks, or output format. Small checks prevent mistakes when the result is reused in source code, API requests, documentation, spreadsheets, or shared files.