YAML Formatter - Beautify and Format YAML Online

YAML Input

Formatted Output

Indent:

What is YAML Formatter?

Got messy YAML (YAML Ain't Markup Language) that's impossible to read? This tool fixes that. It takes your YAML and makes it beautiful – proper indentation, line breaks, everything organized. Whether you're working with Docker Compose, Kubernetes configs, CI/CD pipelines, or just trying to understand what your YAML actually says, this makes it readable. Learn more about YAML on Wikipedia.

According to YAML specification, YAML is a human-readable data serialization standard. Our formatter follows YAML standards, so your formatted YAML is always valid and standards-compliant. Perfect for config files, data files, or any YAML-based configuration.

Best part? Everything happens instantly in your browser. No server uploads, no data storage – just paste, format, and copy. Your YAML stays private.

How to Use the YAML Formatter

Follow these steps to format and beautify your YAML. Each step uses the actual buttons and panels on this page.

Paste, Upload, or Load Sample

Paste minified YAML into the left YAML Input panel, or click Upload to load a .yaml or .yml file. Click Sample to see example telecomm subscriber YAML. Example:

subscriber:
  subscriberId: SUB-1001
  plan: Unlimited 5G
  dataUsage: 45.2
  status: active
  carrier: Verizon

Invalid YAML will show an error. Fix syntax errors first, then format again.

View Formatted Output

The right Formatted Output panel shows the formatted YAML instantly. Use Indent (2 or 4 spaces) and Sort Keys to customize the output.

Copy or Download

Click Copy to copy the formatted YAML to your clipboard, or Download to save as a .yaml file. Use Clear on the input panel to start fresh. All processing runs in your browser.

When You'd Actually Use This

Docker Compose

Format Docker Compose YAML files to understand the structure, debug issues, or improve readability. Works great with docker-compose.yml files.

Kubernetes Configs

Format Kubernetes YAML manifests to review deployments, services, or config maps. Makes it easier to spot errors or understand configurations.

CI/CD Pipelines

Format GitHub Actions, GitLab CI, or other CI/CD YAML configs. Easier to review, debug, or modify pipeline configurations.

Config File Review

Reviewing YAML configuration files? Format them first to see the structure clearly. Makes it easier to spot errors, understand settings, or compare different configurations.

Common Questions

Is my YAML data stored?

No. All formatting happens in your browser using JavaScript. Your YAML Specification never leaves your computer.

What YAML formats are supported?

We support all valid YAML according to the YAML specification. Keys, values, nested structures, arrays, multi-line strings – everything standard YAML supports.

Can I format invalid YAML?

We'll try to format it, but if there are syntax errors, the output might not be perfect. Fix syntax errors first for best results. Use our YAML Validator to check first.

What indentation does it use?

YAML You can choose between 2-space or 4-space indentation. Toggle it in the settings. The default follows common YAML formatting conventions.

How big can my file be?

YAML Specification Since processing happens in your browser, performance depends on your device. Small files format instantly. Very large files (several MB) might take a few seconds, but they'll still work.

Does key sorting affect functionality?

No. Key sorting is purely cosmetic – it only changes the order keys appear, not their values or functionality. Useful for consistent formatting or cleaner diffs.

Other YAML Tools You Might Need

Formatting is just one YAML task. Here are other tools that work well together: