YAML Formatter
Format, validate and beautify YAML data.
Formatted YAML will appear here...
How to use yaml formatter
- 1
Input YAML
Paste your YAML text or upload a .yaml/.yml file.
- 2
Format & Validate
Click Format to beautify the document structure and check indentation rules.
- 3
Copy
Copy the validated YAML configuration to your clipboard.
About the YAML Formatter
YAML is the configuration language behind Docker Compose, Kubernetes manifests, GitHub Actions workflows, and Ansible playbooks — and unlike JSON, its structure is defined entirely by whitespace indentation rather than braces, which makes a single misaligned space a silent, hard-to-spot bug rather than a syntax error some editors will even flag.
This formatter normalizes indentation to a consistent width, validates that the document actually parses (catching tab characters, which YAML disallows for indentation, and inconsistent list-item alignment), and re-serializes it cleanly. It's most useful right before committing a Kubernetes manifest or CI pipeline file, where a formatting mistake won't show up until the deploy or workflow run actually fails.
Frequently Asked Questions
Can you detect invalid YAML?
Yes. YAML parsing is validated with detailed error messages returned by the server.
Does formatting preserve indentation?
The formatter returns well-structured YAML with consistent formatting based on yaml.v3.
How do I use the output?
Use Copy Output to copy the formatted YAML to your clipboard.