Cereio

YAML Formatter

Input

Output

Start typing to format your YAML

Your formatted YAML will appear here

About YAML Formatter

Our free online YAML Formatter is an essential tool for DevOps engineers and developers working with configuration files. It helps you beautify, validate, and format YAML documents instantly. Perfect for Docker, Kubernetes, Ansible, CI/CD pipelines, and any YAML configuration.

Key Features

Real-time Formatting

See your YAML formatted instantly with live validation as you type.

Syntax Validation

Automatically detects YAML syntax errors including indentation issues.

Beautify & Minify

Switch between readable indented format and compact JSON output.

100% Client-side

All YAML processing happens in your browser - your configs stay private.

Copy & Download

Easily copy formatted YAML or download as a .yaml file.

JSON Conversion

YAML is parsed to JSON internally, ensuring valid structure.

How to Use

  1. 1Paste your YAML configuration into the input area on the left.
  2. 2The tool automatically formats and validates your YAML in real-time.
  3. 3Use 'Beautify' for readable format or 'Minify' for compact output.
  4. 4Check the status badge to verify your YAML is valid.
  5. 5Click 'Copy' or 'Download' to save your formatted YAML.

Pro Tips

  • 💡YAML is indentation-sensitive - use consistent spacing (2 or 4 spaces, never tabs).
  • 💡Use the minify option to convert YAML to compact JSON format.
  • 💡Always validate your YAML before deploying to production environments.
  • 💡Quote strings containing special characters like colons or brackets.

Frequently Asked Questions

Is my YAML data secure?
Yes! All YAML processing happens entirely in your browser. Your configuration files are never uploaded to any server.
Why is my YAML showing as invalid?
Common YAML errors include: inconsistent indentation, missing colons after keys, improper list formatting, and unquoted special characters. YAML is very sensitive to indentation.
Can I format multi-document YAML?
The formatter handles standard single-document YAML. For multi-document YAML (with --- separators), process each document separately.
Does it support YAML anchors and aliases?
Yes, YAML anchors (&) and aliases (*) are supported and will be preserved in the formatted output.
What's the difference between YAML and JSON?
YAML is a superset of JSON with a more human-readable format using indentation instead of brackets. Our formatter can convert between both formats.