100% Client-Side

YAML Formatter

Free online YAML formatter and validator. Beautify, format, and validate YAML data with proper indentation. Supports flow-style minification. — runs 100% in your browser, client-side only. No data is sent to any server. Free to use, no account required.

Free Client-Side No Login No Storage
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How to Use the YAML Formatter

  1. Paste your YAML.
  2. Choose Format or Minify mode.
  3. Select indent style and click Format.

Parses and re-serializes YAML with proper indentation using js-yaml. Validates syntax and reports errors.

What is YAML Formatter?

A YAML formatter standardizes YAML formatting with consistent indentation, proper alignment, and clean structure. It can also validate YAML syntax and catch common errors.

Why Use This Tool

YAML is whitespace-sensitive — inconsistent indentation breaks files. A formatter ensures consistent style across configuration files and catches syntax errors before deployment.

When to Use It

Use YAML formatting when cleaning up configuration files, standardizing YAML style across a project, catching indentation errors, or preparing YAML for code review.

Common Uses

  • Formatting Kubernetes manifests
  • Standardizing Docker Compose files
  • Cleaning up Ansible playbooks

Frequently Asked Questions

Does formatting change YAML semantics?

Correct formatting doesn't change meaning. The formatter standardizes indentation (spaces, not tabs) and alignment while preserving all data.

What indentation does YAML use?

YAML requires spaces, not tabs. Common conventions use 2 spaces per level. CipherKit formats with consistent 2-space indentation.

Does this validate YAML?

Yes. The formatter catches syntax errors like inconsistent indentation, invalid characters, and structural issues during parsing.