YAML Formatter Online
Use this free online YAML Formatter tool to beautify, align, and validate raw YAML files securely in your browser.
How it works & FAQ
Browser-Based
Why this is secure?
YAML formatting and validation run in your browser. Your configuration data is never uploaded or transmitted.
Step-by-Step Guide
- 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.
Frequently Asked Questions (FAQ)
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.
Zero Data Leaks
Your YAML is parsed and formatted entirely in your browser. No data is sent anywhere.