# YAML formatter & validator — tidy config, no upload

> Format and validate YAML in your browser: fix indentation, catch syntax errors, and tidy config files. Nothing is uploaded — your YAML stays in the tab.

Format and validate YAML — normalize indentation and catch syntax errors — right in the browser. Your config is parsed locally and never sent anywhere.

YAML's readability comes at the cost of fussy whitespace rules, and a single bad indent breaks a whole config. Formatting normalizes the structure and validation catches the error before your CI does.

To turn YAML into JSON or TOML, use the data converter; for other markup, see the XML formatter.

## How to

1. **Paste YAML.** Paste the YAML config you want to check.
2. **Format & validate.** Indentation is normalized and errors are flagged.
3. **Copy.** Copy the clean, valid YAML back to your file.

## FAQ

### Why is my YAML invalid?

YAML is whitespace-sensitive, so the usual culprits are inconsistent indentation, tabs instead of spaces, or mis-nested keys — the validator points to where parsing fails.

### Can it convert YAML to JSON?

This tool focuses on formatting and validating; for conversions between JSON, YAML, and TOML use the dedicated data converter.

### Is my YAML uploaded?

No. Parsing and formatting run in the browser, so your config stays on your machine.


## Related tools

- [JSON / YAML / TOML](https://www.safepaper.app/dev/data-convert)
- [XML formatter](https://www.safepaper.app/dev/xml-formatter)
- [JSON toolkit](https://www.safepaper.app/dev/json-toolkit)
- [Compose validator](https://www.safepaper.app/dev/docker-compose)

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Canonical HTML: https://www.safepaper.app/dev/yaml-formatter
Markdown: https://www.safepaper.app/dev/yaml-formatter.md

There is no upload endpoint — your files are processed in this browser tab. Open your network tab and check.