yaml
YAML Formatter
Format YAML with standardized indentation
3 free tools
YAML (YAML Ain't Markup Language) is the standard format for Kubernetes manifests, Docker Compose files, GitHub Actions workflows, Ansible playbooks, and most modern DevOps configuration. Our free YAML tools let you format and lint YAML files, validate syntax and indentation, and convert between YAML and JSON — all in your browser.
YAML uses indentation (spaces, never tabs) to represent hierarchy. A single wrong indentation level changes the entire meaning of the document, which is why validation tools are essential before deploying configs.
YAML is a superset of JSON — every valid JSON document is also valid YAML. YAML is easier for humans to write (no quotes or braces required) but more sensitive to formatting errors.