Validate a YAML file online
Check that a YAML file is syntactically valid and pinpoint the error line, in your browser.
or
✓ Valid YAML
🔒 100% client-side — no data sent
Instantly check that a YAML file is syntactically valid and pinpoint the exact line where an error hides. Perfect for debugging a docker-compose file, a CI pipeline or a Kubernetes manifest. Validation runs 100% in your browser, so your files stay private.
What is it for?
- ▸ Debug a docker-compose.yml that refuses to start
- ▸ Check a Kubernetes manifest before a deployment
- ▸ Validate a CI/CD pipeline (GitHub Actions, GitLab CI)
- ▸ Spot an indentation error in a config file
FAQ
Why is my YAML invalid even though it looks correct?
Most often it's indentation using tabs instead of spaces, or an improperly escaped special character. The tool points you to the offending line.
Does the tool show where the error is?
Yes. When there's a syntax error, the line number and an explanatory message are shown to help you fix it.
Are my files sent anywhere?
No. Validation is performed locally in the browser; no data is uploaded.