Are comments preserved?

No. Formatting rebuilds the document from its data, so comments are dropped. Keep a copy if you need them.

Is my data sent to a server?

No. Everything is processed in your browser, which matters when the input is a production payload, token or query. Nothing is uploaded, logged or stored.

YAML Formatter and Validator - Free Online Tool

JavaScript is turned off. InspireTools processes files in your browser, so the tools need JavaScript to run.

Validate YAML and re-indent it consistently.