YAML Formatter

About YAML Formatter Tool

This free online YAML formatter tool pretty-prints messy or minified YAML configuration files with consistent indentation, or minifies verbose YAML by stripping comments and excess whitespace. Whether you're working with Kubernetes manifests, Docker Compose files, GitHub Actions workflows, Ansible playbooks, or any other YAML-based configuration, our formatter ensures clean, readable output. Everything runs 100% in your browser.

Why Format YAML?

YAML files are whitespace-sensitive — incorrect indentation breaks parsing and causes deployment failures. Manual editing often introduces inconsistent spacing, mixed tabs and spaces, and uneven nesting. A YAML formatter normalizes indentation across the entire file, making it easier to read, review, and maintain. Consistent formatting is critical for code reviews, where reviewers need to quickly scan structure without counting spaces. It also prevents "indentation drift" that accumulates as multiple developers edit the same config files over time.

How to Use This YAML Formatter

Paste your YAML into the input panel and select either "Format" for pretty-printing or "Minify" to strip comments and whitespace. For formatting, choose your preferred indentation (2 spaces, 4 spaces, or 8 spaces). Click the action button and the formatted YAML appears in the output panel. Copy the result with one click. The formatter preserves all YAML values, structure, and semantic meaning while normalizing whitespace.

Key Benefits

• Consistent indentation: Normalize mixed spacing to clean, uniform indentation
• Configurable indent: Choose 2 spaces, 4 spaces, or 8 spaces for your project style
• Minification: Strip comments and whitespace to reduce YAML file size
• Structure preservation: All keys, values, arrays, and nesting remain semantically identical
• Comment handling: Formatter preserves comments; minifier strips them for production
• Instant formatting: No server round-trips — everything runs locally in your browser
• Completely private: Your YAML configs never leave your device
• No installation: Works instantly in any modern browser

Common Use Cases

DevOps engineers format Kubernetes manifests (deployments, services, configmaps, ingresses) before committing to Git. Backend developers clean up Docker Compose files and docker-stack.yml configurations. CI/CD engineers maintain GitHub Actions, GitLab CI, CircleCI, and Azure Pipelines YAML workflows. Ansible users format playbooks, roles, and inventory files. Infrastructure teams normalize Terraform and CloudFormation YAML templates. Frontend developers format i18n translation files and static site generator configs (Hugo, Jekyll, Eleventy).

Supported YAML Features

The formatter handles all common YAML constructs: scalar values (strings, numbers, booleans, null), quoted strings, block sequences (arrays with -), nested mappings, comments (preserved in format mode, stripped in minify), blank lines, multi-level nesting, and mixed indentation correction. It works with Kubernetes, Docker Compose, Ansible, GitHub Actions, and all standard YAML 1.1/1.2 files.

Privacy and Security

All formatting and minification happens locally in your browser using JavaScript. Your Kubernetes secrets, database credentials, API keys, cloud configurations, and any other sensitive YAML data never leave your computer. No cookies, no tracking, no server communication. Safe for production configs and confidential infrastructure definitions.