Online YAML Formatter & Validator — Beautify, Compact, Inspect

Free online YAML editor. Beautify, compact, and validate YAML. Interactive tree view included. No data uploaded.

About YAML Formatter, Beautifier & Validator

4.8out of 5 · 156 ratings

This free online YAML formatter, beautifier, and validator cleans up inconsistently indented YAML and validates it against the YAML 1.2 specification. It offers two output modes: beautify re-formats your YAML with consistent 2-space block-style indentation, while compact (flow style) converts the document to inline {} and [] notation for a condensed representation. Syntax errors are highlighted by line number, making it fast to fix Kubernetes manifests, Docker Compose files, and CI/CD configurations. No signup is required and your YAML data never leaves your browser.

Key Features

  • Beautify mode: re-formats YAML with consistent 2-space block-style indentation
  • Compact mode: converts to flow style (inline {} and []) for condensed output
  • Validates YAML 1.2 syntax and highlights errors by line number
  • Supports anchors (&), aliases (*), merge keys (<<), and multi-line block strings
  • Interactive tree view — explore your YAML structure visually
  • 100% browser-based — your config files and secrets never leave your device

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