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YAML Formatter/Validator

Format, minify, and validate YAML with configurable indentation, key sorting, and comment removal. Supports mappings, sequences, flow syntax, quoted strings, and nested structures. Runs entirely in your browser — your data never leaves your machine.

yaml formatter validator minifier config

Published May 28, 2026

All interactive tools run entirely in your browser. Your data never leaves your device.

How It Works

Paste YAML content and choose between format (pretty-print), minify (flow style), or validate mode. The tool parses the YAML into a structured representation, then emits it in the chosen format with proper indentation and formatting.

Features

  • Format mode: proper indentation with configurable indent size (2 or 4 spaces)
  • Minify mode: compact flow-style output on a single line
  • Validate mode: check YAML syntax with clear error messages
  • Key sorting: optionally sort mapping keys alphabetically
  • Comment removal: strip comments during formatting
  • Full YAML support: mappings, sequences, nested structures, flow syntax
  • Scalar types: strings, numbers, booleans, null, quoted values, hex/octal
  • Statistics: character count, key count, line count, nesting depth
  • 5 example templates: simple config, nested, lists, Docker Compose, GitHub Actions
  • Private: runs entirely in the browser — no data transmitted

Use Cases

  • Formatting messy YAML configuration files
  • Minifying YAML for compact storage or transmission
  • Validating YAML syntax before deployment
  • Sorting keys for consistent configuration file structure