TL
Tool Lab
💰捐贈
💰捐贈

YAML Formatter & Validator

Format and normalize YAML instantly. Re-indent messy YAML to consistent 2 or 4-space indentation — runs entirely in your browser.

Input
Output
About This Tool
The YAML Formatter normalizes indentation in YAML files to a consistent style. It automatically detects your existing indent size and re-maps it to your target (2 or 4 spaces), preserving all comments, multi-line strings, anchors, and aliases. It's ideal for normalizing YAML from different sources — CI configs, Kubernetes manifests, Docker Compose files, and more.
Processing runs entirely in your browser. No YAML data is ever sent to any server.
How to Use
  1. Paste your YAML content into the Input panel.
  2. Choose your target indentation (2 or 4 spaces).
  3. Click Fmt to format.
  4. Review the output and click Copy to copy to clipboard.
Use Cases
DevOps engineers use this to normalize Kubernetes YAML manifests, Helm values files, and GitHub Actions workflows. Developers format package.yaml,.travis.yml, and application config files. Data engineers clean up YAML data pipeline configs. The tool is especially useful when merging YAML from multiple sources with different indent conventions.
FAQ
  • Does it validate YAML syntax? — The tool normalizes indentation but does not perform strict schema validation. Syntax errors like duplicate keys or invalid values are not detected.
  • Are comments preserved? — Yes. All comments (#) are preserved at their relative indentation levels.
  • Does it support YAML 1.2? — Yes. All standard YAML 1.2 syntax including anchors (&anchor), aliases (*alias), and block scalars (|, >) is preserved as-is.