YAML Formatter Online

What Is YAML Formatter?

YAML Formatter is a free online tool that parses and reformats YAML files with consistent indentation and structure. It validates your YAML syntax, normalizes whitespace, and produces clean, readable output — making it ideal for cleaning up Kubernetes manifests, Docker Compose files, CI/CD configs, and any other YAML-based configuration files.

How to Use YAML Formatter

1. Paste your YAML into the input panel, or click Load Sample to try an example.
2. Choose your preferred indentation (2 or 4 spaces).
3. The formatted output appears instantly in the right panel.
4. Click Copy to copy the result to clipboard.

Features

• Validates YAML syntax and reports errors clearly
• Reformats with 2-space or 4-space indentation
• Preserves all data types (strings, numbers, booleans, arrays, objects)
• Copy result to clipboard
• Runs entirely in your browser — zero data uploaded

FAQ

Does YAML Formatter validate syntax?

Yes. The formatter parses your YAML using the js-yaml library and reports any syntax errors before formatting.

What indent sizes are supported?

You can choose between 2-space and 4-space indentation.

Is my YAML data sent to a server?

No. All formatting happens entirely in your browser. Your data never leaves your device.