YAML Formatter
Format, validate, and beautify YAML quickly and safely in your browser.
YAML Formatter
Format and validate YAML online. Fast, private, and 100% in-browser with syntax highlighting and line-based error detection.
Input YAML
Formatted YAML
Formatted YAML will appear here after processing
Key Features
Professional-grade tool designed for speed, security, and simplicity
Format & Beautify
Automatically format YAML with proper indentation and structure.
Real-Time Validation
Instant syntax validation with detailed error messages and line numbers.
Privacy First
All formatting happens in your browser. No data ever leaves your device.
How It Works
Simple process for formatting and validating YAML files.
Paste Your YAML
Copy and paste your YAML content into the editor, or upload a .yaml/.yml file.
Automatic Validation
The tool validates syntax in real-time and highlights any errors or issues.
Format & Download
Get beautifully formatted YAML with consistent indentation. Download or copy the result.
Common Use Cases
Kubernetes Manifests
Format and validate complex Kubernetes configuration files.
Docker Compose
Clean up and validate Docker Compose YAML files for multi-container applications.
CI/CD Pipelines
Format workflow files for GitHub Actions, GitLab CI, and other platforms.
Technical Information
Processing Method
Client-side YAML parser validates syntax and reformats with consistent 2-space indentation following YAML 1.2 specification.
Requirements
Modern web browser with JavaScript enabled. No installation or account required.
Compatibility
Supports YAML 1.2 specification. Compatible with Kubernetes, Docker Compose, and all standard YAML tools.
Performance
Processes YAML files up to 5MB instantly. Larger files handled with streaming parser.
Security & Privacy
Data Handling
All YAML processing happens entirely in your browser using JavaScript. No server uploads or external API calls.
Privacy Protection
Your YAML files remain completely private. No data collection, no tracking, no storage of your content.
Security Recommendations
Safe for sensitive configuration files including API keys and credentials. However, always review before deploying to production.
Understanding YAML Format
Human-readable data serialization format
What is YAML?
YAML (YAML Ain't Markup Language) is a human-friendly data serialization language.
- ✓Indentation-based structure (spaces, not tabs)
- ✓Used in Kubernetes, Docker Compose, CI/CD
- ✓Supports complex data structures
YAML vs JSON
More readable than JSON, especially for configuration files.
- ✓No curly braces or commas required
- ✓Comments supported with # symbol
- ~Indentation-sensitive (can cause errors)
Data Types
YAML supports scalars, lists, and mappings.
- •Scalars: strings, numbers, booleans
- •Lists: - item syntax
- •Mappings: key: value pairs
Common Use Cases
Where YAML excels in real-world applications.
- ☸️Kubernetes manifests and configs
- 🐳Docker Compose files
- 🔄CI/CD pipelines (GitHub Actions, GitLab CI)
- ⚙️Application configuration files
Indentation Rules
Critical formatting rules for valid YAML.
- !Use spaces only - never tabs
- ✓Typically 2 spaces per indentation level
- ~Consistent indentation is mandatory
Best Practices
Tips for writing maintainable YAML.
- ✓Use comments to document complex structures
- ✓Quote strings containing special characters
- ✓Validate before deployment
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