YAML Formatter Online
Beautify, align, and validate raw YAML files securely.
Runs entirely in your browser
Formatted YAML appears here as you type
Rate YAML Formatter4.9(95 votes)Rate YAML Formatter
How to use YAML Formatter
- 1Paste your YAML into the input field.
- 2Click 'Format' to normalize indentation and structure.
- 3Errors are shown with line numbers so you can quickly fix syntax issues.
Privacy & security
YAML formatting and validation run in your browser. Your configuration data is never uploaded or transmitted.
Your YAML is parsed and formatted entirely in your browser. No data is sent anywhere.
Frequently asked questions
What kind of errors does this detect?
Indentation errors, duplicate keys, invalid values, unclosed strings, and invalid tab characters (YAML requires spaces, not tabs).
Can I convert YAML to JSON?
Yes — a 'Convert to JSON' option outputs the equivalent JSON representation of your YAML document.
Which YAML versions are supported?
YAML 1.2 is used — the most widely compatible version and the default for Kubernetes, Docker Compose, and GitHub Actions.