YAML Formatter — Format & Beautify YAML Online

What is a YAML Formatter?

A YAML formatter takes raw or inconsistently indented YAML and normalizes it to clean, readable output. YAML is whitespace-sensitive — incorrect indentation causes parse errors. This free online YAML formatter validates your YAML as you type, highlights the exact line of any syntax error, and lets you choose 2-space or 4-space indentation. Used by developers working with Kubernetes manifests, GitHub Actions, Docker Compose, Helm charts, Ansible playbooks, and any other YAML-based configuration. Everything runs entirely in your browser — your data never leaves your device.

How to format YAML in Python

import yaml
data = yaml.safe_load(yaml_string)
print(yaml.dump(data, default_flow_style=False, indent=2))

Common YAML use cases

• Kubernetes — Pod, Deployment, Service, ConfigMap manifests
• GitHub Actions — workflow files in .github/workflows/
• Docker Compose — multi-container application definitions
• Helm — chart values and templates
• Ansible — playbooks and inventory files

Other Free YAML Tools

• YAML Validator — check YAML syntax with exact error line numbers
• YAML Converter — convert between YAML and JSON instantly
• YAML Diff — compare two YAML documents and highlight every change

Sister Tools

• JSON Indent — free JSON formatter, validator, minifier, and diff tool
• XML Indent — free XML formatter, validator, minifier, diff, and XPath tester

Frequently Asked Questions