Peregrine falcon logoPeregrine Dev

YAML Formatter — Format & Validate YAML Free

Paste your YAML and get a cleanly formatted, validated output. Instantly. No sign-up required.

Convert to JSON?

Transform your YAML data into JSON format

How to yaml formatter

  1. 1.Paste or type your raw YAML into the input text area
  2. 2.Click 'Format' to beautify the YAML with consistent indentation
  3. 3.Review the formatted output for structural correctness
  4. 4.Click 'Copy' to copy the formatted YAML to your clipboard

About This Tool

A YAML formatter transforms messy or inconsistently indented YAML data into a clean, human-readable format with uniform indentation and structure. Whether you are editing a Kubernetes manifest, a CI/CD pipeline configuration, or an application settings file, properly formatted YAML is essential for readability and avoiding parsing errors.

This free YAML formatter parses your input and re-serializes it with consistent 2-space indentation. It validates the structure as it parses, so any syntax errors — such as incorrect indentation, missing colons, or invalid nesting — are reported immediately. This makes it a quick way to both format and validate YAML in one step.

All processing happens locally in your browser. Your YAML is never sent to any server, making this YAML formatter safe for configuration files containing secrets, API keys, and other sensitive data. There are no usage limits, no account requirements, and no ads.

Frequently Asked Questions

The tool will display a clear error message indicating what went wrong during parsing. This helps you quickly locate and fix syntax errors such as incorrect indentation, missing colons, or invalid nesting.

The formatter uses 2-space indentation, which is the most common convention for YAML files. All output is normalized to this consistent style regardless of the input's original indentation.

The formatter supports the most commonly used YAML features: key-value pairs, nested objects, arrays, quoted and unquoted strings, numbers, booleans, null values, and multiline strings. Advanced features like anchors, aliases, and tags are not supported.

Yes. If your YAML contains syntax errors, the formatter will report them instead of producing output. Successfully formatted YAML confirms that the input is structurally valid.

No. All formatting happens locally in your browser. Your data is never transmitted to any server and is not stored or logged in any way.

Related Tools

JSON FormatterJSON to YAML