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YAML Formatter

Format and clean up YAML data. Normalize indentation in YAML files.

How to Use YAML Formatter

1

Paste your YAML content

Copy your YAML from a config file, Kubernetes manifest, Docker Compose file, or any source and paste it into the editor.

2

Select formatting options

Choose your preferred indentation size (2 or 4 spaces) and whether to sort keys alphabetically. Select YAML-to-JSON conversion if needed.

3

Format and validate

Click Format to beautify the YAML. The tool validates syntax simultaneously and reports any errors with line numbers and descriptions.

4

Copy or download the result

Use the copy button to grab the formatted YAML for your project. The clean output is ready for Kubernetes, Docker, CI/CD pipelines, or any YAML-based configuration.

About YAML Formatter

YAML formatter online — format, validate, and beautify YAML documents instantly in your browser. This free YAML formatting tool ensures consistent indentation, validates syntax, and can convert between YAML and JSON. Perfect for working with Kubernetes manifests, Docker Compose files, CI/CD pipelines, Ansible playbooks, and application config files. All processing is client-side so your configuration data stays private.

Key Features

  • Format and beautify YAML with consistent indentation and spacing
  • Validate YAML syntax with detailed error messages and line numbers
  • Convert between YAML and JSON formats bidirectionally
  • Support for multi-document YAML files with --- separators
  • Handle complex YAML features like anchors, aliases, and merge keys
  • One-click copy of formatted output for use in config files

Frequently Asked Questions

How to format YAML online for free?▾
Paste your YAML into the editor and click Format. The tool applies consistent indentation (2 spaces by default) and proper spacing to make your YAML clean and readable. No signup required.
How to validate YAML syntax?▾
The formatter validates YAML as it processes, reporting errors like incorrect indentation, invalid characters, duplicate keys, and improper list formatting with exact line numbers.
How to convert YAML to JSON?▾
Paste your YAML content and use the Convert to JSON option. The tool parses the YAML and outputs equivalent JSON with proper formatting. Works for complex nested structures.
How to convert JSON to YAML?▾
Paste JSON content and select Convert to YAML. The tool transforms the JSON into clean YAML with proper indentation and YAML-native syntax like lists with dashes.
How to fix YAML indentation errors?▾
Paste your YAML with broken indentation and the formatter will restructure it with consistent spacing. YAML uses indentation for structure, so correct spacing is critical for valid files.
How to format Kubernetes YAML manifests?▾
Paste your Kubernetes manifest YAML and the formatter will organize it with proper indentation for apiVersion, kind, metadata, spec, and nested container definitions.
How to format Docker Compose YAML files?▾
Paste your docker-compose.yml content and the formatter will ensure services, volumes, networks, and environment variables are properly indented and structured.
How to handle multi-document YAML?▾
The formatter supports multi-document YAML files separated by --- markers. Each document is formatted independently with consistent indentation.