YAML Formatter & Validator

Validate and re-emit YAML in a clean normalized form.

Free · Runs in your browser · Last updated 2026-05-03

Input YAML

Output

About this tool

Paste any YAML to validate the structure and re-emit it normalized. Perfect for Kubernetes manifests, CI configs and OpenAPI files.

Privacy

All processing for YAML Formatter happens locally inside your browser using JavaScript. Your input is never uploaded to a server, logged, or shared with third parties.

Frequently asked questions

Is the YAML Formatter free to use?

Yes. YAML Formatter is completely free for both personal and commercial projects. There are no usage limits, no sign-up, and no premium tier.

Is my data safe when I use YAML Formatter?

All processing happens locally in your browser using JavaScript. Your input is never uploaded to our servers, logged, or shared with any third party.

Does YAML Formatter work offline?

Once the page has loaded, the tool runs entirely client-side. You can disconnect from the internet and it will keep working in the same browser tab.

Which browsers are supported?

YAML Formatter works in all modern browsers, including the latest versions of Chrome, Firefox, Safari, Edge, Brave, and Opera, on desktop and mobile.

Do I need to install anything?

No. YAML Formatter runs in any modern web browser with no installation, browser extension, or account required.

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