YAML Formatter & Validator

Online YAML Formatter

Paste any YAML to normalize its formatting and validate it. Handles Kubernetes manifests, Docker Compose, Helm charts, and any YAML config. Nothing uploaded.

Open the Tool — Free & Instant

Your data never leaves your browser

No server processing

All diffing runs locally in your browser using JavaScript. Zero data transmitted.

No logging or storage

We do not store, log, or read your content. Nothing is saved anywhere.

Safe for sensitive content

Confidential code, config files, API keys — safe to compare here.

PII detection on share

Before any share link is generated, your content is scanned for emails, API keys, and tokens — with options to redact or encrypt.

Features

✓Normalize YAML indentation and formatting
✓Validates YAML and shows exact parse errors
✓Works with Kubernetes manifests and Docker Compose files
✓Handles Helm charts, Ansible playbooks, and CI configs
✓Copy formatted output with one click
✓100% in-browser — YAML never sent to a server
✓No account or sign-up required
✓Free forever

Frequently Asked Questions

How do I format YAML online?

Paste your YAML into the input box above and click "Format". The tool normalizes indentation and structure. If the YAML is invalid, you'll see an exact error message.

What YAML files can I format?

Any YAML — Kubernetes manifests, Docker Compose files, GitHub Actions workflows, Ansible playbooks, Helm values files, OpenAPI specs, and general configuration files.

Can I validate YAML without formatting it?

Yes. Paste your YAML and click Format — if it's invalid, the error tells you exactly what's wrong. If it formats successfully, your YAML is valid.

Is my YAML config kept private?

Completely. All formatting runs locally in your browser using js-yaml. Nothing is sent to any server. Safe to use with infrastructure configs and sensitive YAML.

Can I compare two YAML files after formatting?

Yes. Use the YAML Diff tool to compare two YAML files side-by-side with syntax highlighting. Formatting first helps eliminate noise from indentation-only differences.